DWELL BEYOND THE ORDINARY
ADU Regulations in Missouri : The Complete Guide
Take a deep breath and imagine the sweet state of Missouri with its gorgeous Ozark mountains and cities bursting with culture and history. What better way to enjoy all that Missouri offers than from the comfort of a luxurious modular Accessory Dwelling Unit (ADU)? Whether you’re seeking a peaceful backyard getaway or a way to bring in rental income, ADUs can provide the flexibility and functionality to make it happen.
Before beginning the process of owning an ADU, it is essential for homeowners to understand the laws surrounding their local counties and municipalities. That’s why Zook Cabins has gathered all the important information about ADUs in Missouri for your convenience. Browse your regulations by county and find out if you are able to be a proud new ADU homeowner.
Zook Cabins provides high-quality modular ADUs that are tailored to fit both your lifestyle and your property, giving you the opportunity to create additional housing without sacrificing quality or style. Request a free quote today and take the first step toward your own Missouri ADU.
Are ADUs Allowed in Missouri?
Yes, but the rules depend entirely on where you live. Missouri does not have a statewide ADU law, which means each city, town, and county creates its own regulations. This ultimately means that information regarding ADUs in individual counties is difficult to access online and the best step is to go straight to your municipality to find out what your building and zoning departments allow.
The type of ADU can also impact what is and is not allowed. Typically, it is slightly easier to get approval for attached ADUs while detached ADUs require more permits and regulations.
What Is Considered An ADU in Missouri?
In Missouri, an Accessory Dwelling Unit (ADU) is defined as a smaller, secondary dwelling unit located on the same property as a primary single-family residence. It can be attached to or detached from the main house and must contain living, sleeping, cooking, and bathroom facilities. ADUs are intended to provide independent living space, often for family members or as a source of rental income, and are typically not sold or separated from the main house.
Can Park Model Tiny Homes Be Used As ADUs?
It is certainly possible! Park model homes are built to all the standards of an RV but are designed to stay in place and are 400 square feet or less. Because of this, certain Missouri counties may allow the park model home to be used as a permanent ADU, but to confirm this, it is important to check with your local zoning authorities.
Can Log Cabins Be Used As An ADU?
Yes! If a smaller prefab log cabin fits within the size requirements that your Missouri municipality has for ADUs, it can definitely be a possibility. Especially if you live within a more rural area, you may have a better setup for a log cabin ADU. Local regulations will still control details like setbacks, height restrictions, and whether the ADU must match the exterior style of the primary dwelling, so it’s always best to get your building department’s approval before committing to a purchase.
Can Modern Cabins Be Used As An ADU?
Yes, modern cabins can be an excellent choice for an ADU in Missouri if they comply with the local size, height, and setback rules. Some localities allow ADUs up to 1,000 square feet, while others are more restrictive, but Zook Cabins offers multiple modern designs under that size threshold. As with any ADU type, the key factor is local compliance which means a modern cabin can be fully eligible in one jurisdiction while needing modifications in another.
What is the Difference Between a Prefab ADU & a Modular ADU?
The distinction lies mainly in how they are constructed and delivered. A prefab ADU is built entirely in a factory and shipped as one complete structure, ready to be set on a permanent foundation.
A modular ADU is also factory-built but comes in multiple sections, which are assembled on-site and finalized by a construction crew.
In Missouri, local codes generally treat prefab and modular ADUs the same way as long as they meet building standards and are installed on a permanent foundation. Zook Cabins specializes in modular ADUs built to single-wide modular home standards, ensuring they meet both state and local requirements.
Size & Placement Requirements For ADUs in Missouri
What is the Minimum Size for an Accessory Dwelling Unit in Missouri?
Most Missouri counties set no statewide minimum for ADUs, leaving those decisions to local governments. In practice, most municipalities require a minimum of 300 square feet.
In Missouri, Can My ADU be Bigger Than My House?
No, because ADUs are designed to be an accompanying structure, there are no areas which allow them to be larger than your primary dwelling. Most states cap ADUs at a certain square footage or a percentage of the main house. In Missouri, this is around 800-1,000 square feet.
How Close To My House Can I Build An ADU in Missouri?
Just like other requirements, lack of state and county wide regulations make this unclear and left up to local discretion. That said, the typical requirement is a minimum setback of 5 ft and a 3 ft side setback. ADUs are generally required to be at least 10 ft away from the primary dwelling.
Do You Need A Permit For An ADU in Missouri?
Yes, without exception. Every ADU in Missouri requires a building permit, which confirms compliance with zoning, safety, and construction standards. In addition to the building permit, you may also need electrical, plumbing, and HVAC permits, plus environmental health permits if you’re connecting to a septic system. While the permitting process may seem tedious, it ensures your ADU is legal and safe for long-term occupancy.
Are There Any Incentives or Grants for ADUs in Missouri?
As of right now, Missouri doesn’t have any state-wide programs for ADU grants or financial assistance. Certain counties may have programs that waive certain fees or promote affordable housing through reduced permitting costs, but these are localized and vary greatly. If affordability is a concern, it’s worth asking your municipality if any temporary initiatives or pilot programs are in place.
What Features are Included in An ADU from Zook Cabins?
Are Zook Cabin’s ADUs Built to Code?
Absolutely! All Zook Cabins ADUs are designed to meet or exceed local building codes in Missouri. They are fully customized to include the necessary living, kitchen, and bathroom spaces, and can be configured to suit one- or two-bedroom layouts. Our experienced team designs and crafts each modular ADU for both durability and comfort. No matter how you utilize your ADU, you can rest assured knowing all the codes and permits are taken care of.
Can ADUs in Missouri Have Multiple Bedrooms and Bathrooms?
You sure can. Depending on where you reside, your Missouri county will permit enough square footage to accommodate a multi-bedroom/bathroom ADU. Zook Cabins offers several 1 bedroom ADU models that are perfect for a single or couple starting off life in an ADU. We also design and sell several two bedroom models that may fit the needs of a small family better. Our Grove ADU has the option for two bedrooms and two bathrooms while still fitting under 1,000 square feet.
Are ADUs A Good Investment in Missouri?
Yes! An accessory dwelling unit offers flexibility in its use. You can use it as an additional source of income through short or long-term rentals, house aging parents, or have it as an extra guest house for visiting friends and family. Plus, it can increase your property value when you go to re-sell your house!
However, keep in mind that each municipality may have governing laws for how an ADU may be used in relation to rentals and usuages.
What Counties in Missouri Allow ADUs?
Does Adair County, Missouri, Allow ADUs?
Adair County does not have countywide zoning or building regulations in the unincorporated area, so there is no county ordinance that expressly allows or prohibits accessory dwelling units. In practice, a second dwelling on a parcel in unincorporated Adair is handled through basic state and county requirements like septic approvals and any floodplain permits, while any property inside a city such as Kirksville must follow that city’s zoning rules. If your site is outside city limits and you need a definitive ruling, your next step is to speak with the County Commission and the county recorder and confirm septic and floodplain approvals; if inside city limits, contact the city codes and planning office for ADU requirements.
Does Andrew County, Missouri, Allow ADUs?
Andrew County has no county zoning and does not issue building or occupancy permits for unincorporated areas, so there is no county ADU ordinance. That means ADUs are not specifically regulated by the county in unincorporated areas, though state and county health and floodplain rules still apply.
If the property is inside an incorporated city such as Savannah, you must follow that city’s zoning and permitting process. If your site is outside city limits and you need certainty, your next step is to confirm septic and floodplain approvals and consult the County Commission; if inside a city, contact the city building and zoning office.
Does Atchison County, Missouri, Allow ADUs?
Atchison County does not have county planning and zoning, so there is no county ordinance that specifically authorizes or regulates accessory dwelling units in the unincorporated area. ADUs in unincorporated Atchison therefore default to basic health and floodplain requirements, while any property inside a city such as Rock Port must meet that city’s zoning code. If the county adopts zoning in the future, standards could change.
If your parcel is outside city limits and you need a definitive path, your next step is to verify septic and floodplain requirements with the county and consult the County Commission; if inside a city, check with the city planning department for ADU rules.
Does Audrain County, Missouri, Allow ADUs?
Audrain County does not maintain county-level planning or zoning ordinances, so there is no explicit county regulation that allows or prohibits accessory dwelling units in unincorporated areas. ADUs are neither authorized nor restricted at the county level—development is guided solely by applicable state, health, and floodplain standards. For properties within a municipality such as Mexico or Centralia, you must comply with that city’s zoning code and permitting rules. If you’re located outside city limits and need clarity on ADUs, your next move is to consult the County Commission for septic and health-related requirements.
Does Barry County, Missouri, Allow ADUs?
It is unknown at this point. Barry County does have a zoning ordinance governing land use, but it does not specifically reference accessory dwelling units as a defined or regulated use. The code allows for subordinate dwelling types such as “farmhand dwellings” under certain rural zoning conditions, and also provides for seasonal labor housing, but it makes no mention of ADUs in residential zones.
Thus, constructing an ADU would depend on whether the structure could qualify under one of these special provisions or would require a variance or rezoning. For precise guidance, contact the Barry County Planning Commission or Zoning Administrator to explore whether your ADU concept can be accommodated.
Does Barton County, Missouri, Allow ADUs?
Barton County has a formal zoning code in place, but it does not clearly authorize accessory dwelling units as a permitted use in residential districts. The county zoning regulations describe accessory structures and uses in general terms but do not label ADUs or secondary residences as allowed or defined categories.
While the zoning code is comprehensive, there is no direct reference to accessory living units. If you’re aiming to build an ADU, you should reach out to the County Commission or planning staff to determine whether your proposed unit could be approved potentially via a special use permit or amendment to current zoning rules.
Does Bates County, Missouri, Allow ADUs?
Bates County does not operate under a countywide zoning ordinance for unincorporated areas, so there are no county rules specifically addressing accessory dwelling units. This means that in rural areas, ADUs are generally subject only to state building standards, septic requirements, and any floodplain regulations.
However, if your property lies within an incorporated city such as Butler or Adrian, you must comply with that city’s zoning and building codes, which may or may not allow ADUs. For unincorporated parcels, your next step is to confirm requirements with the Bates County Commission to ensure compliance with septic, water, and safety standards.
Does Benton County, Missouri, Allow ADUs?
Benton County has zoning regulations that classify and control land uses, but the ordinance does not specifically define or regulate accessory dwelling units as a separate category. Depending on your property’s zoning district, an ADU might be considered either an accessory structure or a secondary dwelling, both of which can carry limitations on size, placement, and occupancy. In many cases, adding a second dwelling will require a conditional use permit. To determine whether your planned ADU meets the county’s requirements, contact the Benton County Planning and Zoning office for guidance on allowable uses in your zoning district.
Does Bollinger County, Missouri, Allow ADUs?
Bollinger County has no countywide planning and zoning for unincorporated areas, so ADUs are not addressed in county ordinances. This lack of regulation means that in rural areas, building an ADU will typically be governed by state requirements, septic system approval, and any applicable floodplain standards. Properties within incorporated areas such as Marble Hill must follow that city’s zoning codes, which may impose their own rules for secondary units. If you are in unincorporated Bollinger County and want certainty before proceeding, your next step is to check with the County Commission and the county health department regarding septic and utility compliance.
Does Boone County, Missouri, Allow ADUs?
Boone County has adopted a zoning ordinance that includes provisions for accessory dwellings under certain circumstances. In rural zoning districts, a second dwelling unit on a property may be permitted as an accessory dwelling if it meets requirements for lot size, setbacks, and utility connections, and in some cases, a conditional use permit is required. In more urbanized residential zones, ADUs may be more restricted and subject to additional review.
The county’s regulations also require compliance with building codes and health department standards. For exact requirements on your parcel, contact the Boone County Resource Management Department to confirm whether your planned ADU is permitted in your zoning district.
Does Buchanan County, Missouri, Allow ADUs?
Buchanan County does not have countywide zoning for unincorporated areas, meaning there are no specific county rules regulating ADUs outside of incorporated cities. In unincorporated areas, secondary units are generally subject only to state building laws, septic approval, and any applicable floodplain rules. Within the city of St. Joseph or other municipalities in Buchanan County, local zoning codes will determine if ADUs are allowed and under what conditions. If you are in an unincorporated part of the county and need clarity, your next step is to consult the County Commission and county health department for guidance on septic and structural compliance.
Does Butler County, Missouri, Allow ADUs?
Butler County has no countywide zoning ordinance, so ADUs are not specifically addressed at the county level in unincorporated areas. As a result, the ability to build a second dwelling on your property is largely determined by state standards, septic system approval, and any floodplain regulations that may apply. However, properties within the city limits of Poplar Bluff or other municipalities must follow that city’s zoning and building codes, which may set clear requirements or limitations on ADUs. For unincorporated properties, the next step is to confirm requirements with the Butler County Commission before proceeding with any construction.
Does Caldwell County, Missouri, Allow ADUs?
Caldwell County does not have a countywide zoning ordinance for unincorporated areas, so there are no county-specific rules that directly allow or prohibit accessory dwelling units. In rural parts of the county, ADUs are generally only subject to state building laws, septic system approval, and floodplain regulations.
If your property is within an incorporated area such as Kingston, the city’s zoning code will determine whether an ADU is permitted. For unincorporated parcels, the next step is to check with the Caldwell County Commission and the county health department to confirm septic and utility compliance before building.
Does Callaway County, Missouri, Allow ADUs?
Callaway County operates under zoning regulations that can allow a second dwelling on a property in certain districts, but ADUs are not always identified as a specific use in the ordinance. Depending on your zoning classification, an accessory unit may be treated as a secondary dwelling, which often requires a conditional use permit and compliance with size, placement, and utility requirements. Building codes and health department standards also apply. To determine your property’s eligibility, contact the Callaway County Planning and Zoning Department for guidance on your zoning district’s rules for additional dwellings.
Does Camden County, Missouri, Allow ADUs?
It is somewhat unclear. Camden County has zoning ordinances in place that regulate land use and may allow accessory dwellings under specific conditions. In certain residential or rural zones, an ADU might be permitted either as an accessory structure or a guesthouse, but it must comply with lot size, setback, and utility connection requirements.
Some cases require a conditional use permit, and the property must also meet building code and health department standards. For exact regulations on your parcel, the next step is to consult the Camden County Planning and Zoning Department to verify whether an ADU is allowed in your zoning district.
Does Cape Girardeau County, Missouri, Allow ADUs?
Cape Girardeau County does not have a countywide zoning ordinance for unincorporated areas, so there are no specific county rules regarding accessory dwelling units outside of incorporated municipalities. In rural areas, an ADU would be subject to state building standards, septic system approval, and any applicable floodplain restrictions.
If your property is within city limits, such as the City of Cape Girardeau or Jackson, you must follow that municipality’s zoning code, which may have explicit ADU provisions. For unincorporated properties, your next step is to confirm septic and utility compliance with the county health department and consult the County Commission before starting construction.
Does Carroll County, Missouri, Allow ADUs?
Carroll County does not regulate land use through countywide zoning in unincorporated areas, meaning ADUs are not directly addressed at the county level. In rural areas, state building requirements, septic approvals, and floodplain rules are the primary considerations.
Within incorporated areas like Carrollton, you must follow the city’s zoning and permitting rules, which may or may not permit ADUs. If you are in unincorporated Carroll County and want clarity, your next step is to check with the Carroll County Commission to ensure compliance with all applicable requirements before building.
Does Carter County, Missouri, Allow ADUs?
Carter County does not have a countywide zoning ordinance for unincorporated areas, so there is no county regulation that specifically allows or prohibits accessory dwelling units. Rural properties are generally governed by state building codes, septic system regulations, and any floodplain requirements.
If the property is within an incorporated city, that city’s zoning code will determine whether ADUs are permitted. For unincorporated parcels, your next step is to consult the Carter County Commission and the county health department to verify septic and building compliance before proceeding.
Does Cass County, Missouri, Allow ADUs?
In Cass County, zoning regulations are in place for unincorporated areas, and whether an accessory dwelling unit is allowed depends entirely on the property’s zoning classification. Certain rural and agricultural zones may permit a second residence as an accessory use if it meets standards for lot size, setbacks, and utility connections, while residential zones tend to be more restrictive.
Some ADUs require a conditional use permit and full compliance with building and health codes. The most reliable way to move forward is to check directly with the Cass County Planning and Zoning Department to confirm how your zoning district handles additional dwellings.
Does Cedar County, Missouri, Allow ADUs?
At present, Cedar County does not operate under a countywide zoning ordinance for unincorporated areas, so there are no explicit county rules addressing accessory dwelling units. This means rural property owners generally follow state construction laws, septic system requirements, and any floodplain regulations that apply.
For properties located within a city such as Stockton, local zoning rules will determine if an ADU is permitted. If you are in an unincorporated part of Cedar County and want certainty, your next step should be to consult the County Commission and the county health department to verify your project meets all health and safety requirements.
Does Chariton County, Missouri, Allow ADUs?
Chariton County takes a straightforward approach, with no county zoning regulations for unincorporated areas that directly address ADUs. In rural locations, the main requirements will be compliance with state building standards, proper septic system installation, and adherence to any floodplain restrictions. Incorporated communities such as Keytesville or Salisbury may have their own zoning ordinances that specifically allow or prohibit ADUs. Before moving ahead with construction in the unincorporated county, it is best to speak with the Chariton County Commission to confirm what steps are needed for approval.
Does Christian County, Missouri, Allow ADUs?
Currently, Christian County has zoning regulations that outline land uses in both rural and more developed areas, and accessory dwelling units can be possible in certain zoning districts. Rural or agricultural zones may allow a second dwelling as an accessory use, provided it meets requirements for lot size, setbacks, and utility hookups. In more densely zoned residential areas, ADUs may be restricted or require a conditional use permit. All ADUs must follow building codes and health regulations. To be sure your property qualifies, contact the Christian County Planning and Zoning Department for details based on your zoning classification.
Does Clark County, Missouri, Allow ADUs?
Like many rural counties in Missouri, Clark County does not have a countywide zoning ordinance for unincorporated areas, which means there are no local rules specifically permitting or prohibiting ADUs. In these rural areas, state building codes, septic system approvals, and floodplain restrictions are the key considerations. If your property is inside a municipality such as Kahoka, the city’s zoning code will control whether an ADU is allowed. For unincorporated landowners, the best next step is to confirm septic and safety compliance with the Clark County Health Department and seek guidance from the County Commission.
Does Clay County, Missouri, Allow ADUs?
Clay County has established zoning regulations for unincorporated areas, and whether you can build an ADU depends on your zoning district. Certain rural and estate districts may allow a secondary unit under strict requirements for size, placement, and utility connections, while suburban residential zones are typically more restrictive. Some projects will require a conditional use permit and review by county planning staff. Building codes and health department rules also apply. Before beginning, consult the Clay County Planning and Zoning Department to see if your parcel is eligible for an ADU under current regulations.
Does Clinton County, Missouri, Allow ADUs?
In Clinton County, there is no countywide zoning ordinance for unincorporated areas, so there are no local regulations specifically addressing accessory dwelling units outside of municipalities. In rural parts of the county, ADUs are generally subject only to state construction requirements, septic system approval, and any applicable floodplain rules. If the property is located within an incorporated city such as Plattsburg, you must follow that city’s zoning code, which may provide specific ADU guidelines. For unincorporated properties, the next step is to confirm septic and building compliance with the Clinton County Health Department and seek direction from the County Commission.
Does Cole County, Missouri, Allow ADUs?
Cole County uses zoning regulations in certain unincorporated areas, and the permissibility of an accessory dwelling unit depends on the specific zoning district. Rural and agricultural zones may allow a secondary unit if it meets standards for lot size, setbacks, and utility service, while residential districts may limit or prohibit them. In some cases, a conditional use permit is required, along with adherence to building and health codes. To determine the exact requirements for your property, it is best to consult the Cole County Planning Department for current ADU regulations in your zoning classification.
Does Cooper County, Missouri, Allow ADUs?
Cooper County does not have countywide zoning for unincorporated areas, which means ADUs are not directly regulated at the county level outside of cities. In rural areas, the primary requirements are compliance with state building laws, septic system approval, and floodplain restrictions if applicable. Incorporated municipalities such as Boonville have their own zoning codes that may explicitly permit or restrict ADUs. For properties outside city limits, your next step should be to contact the Cooper County Health Department and the County Commission to verify all applicable requirements before construction.
Does Crawford County, Missouri, Allow ADUs?
Crawford County does not operate under a countywide zoning ordinance for unincorporated areas, so there are no local rules that specifically permit or restrict accessory dwelling units outside of cities. In rural areas, ADUs are generally subject only to state construction standards, septic system approval, and any floodplain restrictions. If the property lies within a municipality such as Cuba or Steelville, the city’s zoning code will control whether an ADU is allowed. For unincorporated properties, the next step is to check with the Crawford County Commission to confirm all necessary approvals before moving forward.
Does Dade County, Missouri, Allow ADUs?
Dade County currently has no countywide zoning for unincorporated areas, meaning ADUs are not specifically addressed at the county level. In rural locations, state building codes, septic system requirements, and floodplain regulations are the primary considerations for adding a second dwelling. Within incorporated communities such as Greenfield, local zoning ordinances will determine ADU allowances and requirements. If you are outside city limits, the best course of action is to contact the Dade County Commission to ensure your project complies with all applicable standards.
Does Dallas County, Missouri, Allow ADUs?
Dallas County does not have a countywide zoning ordinance for its unincorporated areas, so accessory dwelling units are not directly regulated by local law outside of municipalities. In rural parts of the county, ADUs must meet state building codes, septic system rules, and any floodplain requirements that apply. Properties inside incorporated towns such as Buffalo are subject to that city’s zoning and permitting process. If your land is in unincorporated Dallas County, your next step should be to consult the County Commission to verify all requirements before starting construction.
Does Daviess County, Missouri, Allow ADUs?
Daviess County does not enforce a countywide zoning ordinance for unincorporated areas, so there are no local regulations specifically governing accessory dwelling units outside of cities. In rural areas, the main requirements will be meeting state building standards, securing septic system approval, and complying with any floodplain restrictions. If your property is inside an incorporated community such as Gallatin, the city’s zoning rules will determine whether ADUs are permitted. For properties outside city limits, the next step is to confirm septic and structural compliance with the Daviess County Commission.
Does DeKalb County, Missouri, Allow ADUs?
DeKalb County has no countywide zoning in unincorporated areas, meaning ADUs are not addressed in county-level ordinances. In rural parts of the county, adding an ADU will require compliance with state construction standards, septic regulations, and any floodplain management rules. Within incorporated municipalities such as Maysville, the city’s zoning code controls whether a secondary dwelling is allowed. If your property is in unincorporated DeKalb County, the recommended next step is to contact the County Commission to ensure your project meets all health and safety requirements.
Does Dent County, Missouri, Allow ADUs?
Dent County does not maintain a countywide zoning ordinance for its unincorporated areas, so ADUs are not specifically regulated at the county level outside municipalities. Rural property owners must still comply with state building codes, septic system approvals, and floodplain restrictions where applicable. If your property is within an incorporated area such as Salem, the local zoning code will dictate whether an ADU is allowed and under what conditions. For unincorporated parcels, the next step is to verify septic and building compliance with the Dent County Commission before construction begins.
Does Douglas County, Missouri, Allow ADUs?
For those looking to add an accessory dwelling unit to their property in Douglas County, it’s important to know that the county does not have a zoning ordinance for unincorporated areas. This means there is no local law that directly allows or bans ADUs outside of city limits.
In rural areas, you will need to meet Missouri’s building standards, obtain septic system approval, and follow any floodplain rules that apply. If your property is inside an incorporated town like Ava, that town’s zoning code will control what is allowed. Owners in the unincorporated county should check with the Douglas County Commission before moving forward.
Does Dunklin County, Missouri, Allow ADUs?
If you are considering an ADU in Dunklin County, be aware that the county does not operate under a countywide zoning system for unincorporated areas. Without local zoning regulations, ADUs in rural areas are primarily guided by state construction laws, septic requirements, and floodplain regulations. Those in cities such as Kennett must follow the city’s zoning ordinances, which may set specific standards or restrictions for accessory dwellings. For anyone outside city limits, the smart next step is to contact the Dunklin County Commission to confirm what approvals are necessary.
Does Franklin County, Missouri, Allow ADUs?
Homeowners in Franklin County who are interested in building an ADU will find that the county has established zoning regulations that apply to unincorporated areas. In certain districts—especially rural or agricultural zones—a secondary dwelling may be allowed as an accessory use if it meets standards for size, location, and utilities. Residential zones may have tighter restrictions or require a conditional use permit. In all cases, you must comply with building codes and health department requirements. To be sure you can move ahead with your project, consult the Franklin County Planning and Zoning Department for details on your specific zoning classification.
Does Gasconade County, Missouri, Allow ADUs?
If you own property in Gasconade County and are thinking about adding an ADU, it’s important to note that the county does not have zoning for unincorporated areas. Without a county ordinance, there are no local restrictions specific to accessory dwellings outside city limits, though you’ll still need to follow Missouri’s building standards, septic system regulations, and any floodplain requirements. Properties within incorporated towns such as Hermann must comply with that town’s zoning rules, which may specifically address ADUs. For rural properties, the best next step is to reach out to the Gasconade County Commission to confirm what’s required before you build.
Does Gentry County, Missouri, Allow ADUs?
Property owners in Gentry County will find there is no countywide zoning ordinance in place for unincorporated areas, which means the county does not have specific rules for accessory dwelling units.
In rural areas, the focus will be on meeting state construction laws, obtaining septic approval, and following any applicable floodplain regulations. If your property is in a municipality like Albany, the city’s zoning code will dictate whether an ADU is permitted. For those outside city boundaries, the next move should be to contact the Gentry County Commission to ensure all health and safety requirements are met.
Does Greene County, Missouri, Allow ADUs?
For residents of Greene County, zoning regulations are in effect for unincorporated areas, and the ability to build an ADU depends on the zoning district. Some rural or agricultural zones may allow a secondary unit if it meets size, setback, and utility standards, while residential zones are often more restrictive. Certain ADUs require a conditional use permit along with compliance with building codes and health regulations. Anyone interested in building should consult the Greene County Resource Management Department to determine whether an ADU is allowed on their property.
Does Grundy County, Missouri, Allow ADUs?
If you’re considering an ADU in Grundy County, know that the county does not have zoning for unincorporated areas. As a result, there are no county rules directly permitting or restricting accessory dwellings in rural areas. The primary requirements will come from state construction laws, septic system approval, and any floodplain limitations. Within incorporated areas such as Trenton, the local zoning ordinance will decide if an ADU is possible. For rural properties, it’s wise to speak with the Grundy County Commission before beginning any construction.
Does Harrison County, Missouri, Allow ADUs?
Harrison County does not regulate land use through countywide zoning for unincorporated areas, so ADUs are not specifically addressed at the county level. In rural areas, adding an accessory dwelling will require following Missouri building standards, securing septic approval, and meeting any floodplain restrictions. Inside incorporated towns like Bethany, local zoning rules will determine whether ADUs are permitted. For anyone in the unincorporated county, the next step should be contacting the Harrison County Commission to clarify what’s needed for your project.
Does Henry County, Missouri, Allow ADUs?
In Henry County, property owners outside of incorporated areas will find that there is no countywide zoning ordinance in place. Without specific local land-use rules, ADUs in rural areas are generally subject only to Missouri’s building codes, septic system requirements, and floodplain regulations. If your land is within an incorporated city such as Clinton, the city’s zoning rules will determine whether an accessory dwelling is allowed. For those in unincorporated Henry County, the best approach is to verify septic and safety compliance with the county health department and speak with the County Commission before starting any building work.
Does Hickory County, Missouri, Allow ADUs?
Those interested in building an ADU in Hickory County should know that the county does not have zoning regulations for unincorporated areas. In rural locations, this means the county does not impose its own restrictions, but you must still comply with state building standards, septic approvals, and any floodplain requirements. Within incorporated towns such as Hermitage, the city’s zoning ordinance will control ADU allowances. Before breaking ground, rural property owners should confirm requirements with the Hickory County Health Department and the County Commission.
Does Holt County, Missouri, Allow ADUs?
ADUs in Holt County are not specifically addressed by county regulations, as there is no zoning ordinance for unincorporated areas. In practice, rural property owners must follow state construction rules, septic system standards, and any floodplain management guidelines. If you are within a city like Mound City, municipal zoning laws will decide whether a secondary dwelling is permitted. For unincorporated properties, your next step is to reach out to the Holt County County Commission to clarify the necessary approvals.
Does Howard County, Missouri, Allow ADUs?
Adding an accessory dwelling in Howard County will depend on whether your property is inside or outside city limits. The county does not have zoning for unincorporated areas, meaning there are no local ordinances that directly permit or prohibit ADUs in rural zones. However, all state building codes, septic requirements, and floodplain regulations must be met. If you are in an incorporated municipality such as Fayette, the city’s zoning code will determine ADU eligibility. Rural landowners should check with the Howard County Commission for guidance before moving forward.
Does Howell County, Missouri, Allow ADUs?
For Howell County residents considering an ADU, it’s important to know that there is no countywide zoning ordinance in unincorporated areas. Without local land-use restrictions, rural ADUs are guided mainly by state building standards, septic regulations, and floodplain rules. Inside cities such as West Plains, local zoning codes will control what is allowed. Anyone planning to build in unincorporated Howell County should first confirm septic system approval and construction compliance with the county health department and discuss their plans with the County Commission.
Does Iron County, Missouri, Allow ADUs?
Building an ADU in Iron County is largely dependent on whether your property lies inside city limits. Iron County itself does not have zoning regulations for unincorporated areas, so there are no local rules that directly govern accessory dwellings in rural zones.
State building standards, septic system approval, and floodplain restrictions still apply. If your property is in an incorporated community such as Ironton or Pilot Knob, you’ll need to follow that city’s zoning ordinances. For rural parcels, reach out to the Iron County Commission to confirm all necessary requirements before starting construction.
Does Jackson County, Missouri, Allow ADUs?
Jackson County has zoning ordinances in place for unincorporated areas, and the rules for ADUs vary depending on the zoning district. In some rural or agricultural districts, a secondary dwelling may be allowed as an accessory use if it meets lot size, setback, and utility standards. Residential zones often have stricter limits or require a conditional use permit. All ADUs must comply with building codes and health regulations. To determine whether your property qualifies, contact the Jackson County Planning and Zoning Department for guidance based on your zoning classification.
Does Jasper County, Missouri, Allow ADUs?
For those in Jasper County’s unincorporated areas, there is no countywide zoning ordinance, meaning ADUs are not specifically regulated at the county level. Rural properties are instead subject to Missouri’s construction requirements, septic system rules, and any floodplain regulations. Inside incorporated municipalities such as Joplin or Carthage, local zoning codes will dictate whether an accessory dwelling can be built. If you are outside city limits, the next step is to speak with the Jasper County Commission to ensure your project meets all health and safety standards.
Does Jefferson County, Missouri, Allow ADUs?
Jefferson County maintains zoning regulations that apply to unincorporated areas, and the ability to add an ADU depends on the zoning district. Some rural and estate residential zones may allow secondary units if they meet criteria for size, placement, and utility connections, while other residential districts are more restrictive. Conditional use permits are often required, and all ADUs must follow building codes and health department rules. For accurate information, contact the Jefferson County Department of Planning and Zoning to confirm what is possible for your property.
Does Johnson County, Missouri, Allow ADUs?
In Johnson County, there is no countywide zoning ordinance for unincorporated areas, leaving ADUs unregulated at the county level in rural zones. State building laws, septic system approval, and floodplain restrictions still apply. Within cities such as Warrensburg or Holden, ADU rules are governed by municipal zoning codes. If you’re in the unincorporated county and wish to proceed, coordinate with the Johnson County Commission to confirm all necessary compliance steps before building.
Does Knox County, Missouri, Allow ADUs?
In Knox County, there is no countywide zoning ordinance for unincorporated areas, so there are no local rules directly allowing or prohibiting ADUs in rural zones. Any secondary dwelling will need to comply with Missouri’s building codes, septic system requirements, and floodplain regulations where applicable. If the property is inside an incorporated community such as Edina, the city’s zoning ordinance will determine whether an ADU is permitted. For unincorporated parcels, it’s wise to contact the Knox County Health Department and County Commission to confirm all requirements before beginning construction.
Does Laclede County, Missouri, Allow ADUs?
Laclede County does not regulate land use through countywide zoning in unincorporated areas, which means ADUs are not specifically addressed at the county level. In rural parts of the county, you’ll need to meet state construction standards, obtain septic approval, and follow any floodplain rules. Within incorporated areas such as Lebanon, municipal zoning codes will control whether a secondary dwelling is allowed. Property owners in unincorporated Laclede County should speak with the county health department and County Commission to make sure all standards are met before building.
Does Lafayette County, Missouri, Allow ADUs?
For those in Lafayette County who are considering an ADU, it’s important to know the county does not have a zoning ordinance for unincorporated areas. Without local zoning, rural properties are governed by Missouri’s building regulations, septic system standards, and floodplain requirements. Inside municipalities like Lexington or Odessa, the city’s zoning code will decide if and how an ADU can be built. Before starting any construction in unincorporated Lafayette County, confirm requirements with the county health department and County Commission.
Does Lawrence County, Missouri, Allow ADUs?
Lawrence County does not operate under countywide zoning for its unincorporated areas, so accessory dwelling units are not directly regulated at the county level in rural zones. Compliance with state building laws, septic approvals, and floodplain standards is required. If the property is within a city such as Mount Vernon or Aurora, the municipal zoning ordinance will set the rules for ADUs. Rural property owners should check with the Lawrence County Commission to ensure all approvals are in place before building.
Does Lewis County, Missouri, Allow ADUs?
In Lewis County, there is no countywide zoning ordinance for unincorporated areas, meaning ADUs are neither explicitly permitted nor prohibited at the county level. Rural construction must still meet Missouri’s building requirements, septic regulations, and floodplain restrictions. If your land is within a city such as Canton or La Grange, the local zoning code will determine whether an ADU is possible. For unincorporated properties, it’s recommended to consult the Lewis County Commission to confirm what is required before beginning the project.
Does Lincoln County, Missouri, Allow ADUs?
In Lincoln County, there is no countywide zoning ordinance for unincorporated areas, so ADUs are not specifically regulated outside of municipalities. Rural property owners must still meet Missouri’s building code, obtain septic system approval, and follow any floodplain restrictions. If your property is inside a city such as Troy or Elsberry, the municipal zoning code will determine ADU eligibility, including requirements for setbacks, maximum height, and lot coverage. Those in unincorporated areas should consult the Lincoln County Commission to clarify what standards will apply before construction.
Does Linn County, Missouri, Allow ADUs?
Linn County does not impose zoning regulations in unincorporated areas, meaning ADUs are not directly addressed at the county level. In rural zones, the main requirements are compliance with state construction laws, proper septic installation, and floodplain regulations if applicable. Within incorporated communities such as Brookfield or Marceline, local zoning ordinances will specify whether ADUs are allowed and may include details on minimum lot size and setback requirements. For properties outside city limits, it’s best to confirm project details with the Linn County Commission.
Does Livingston County, Missouri, Allow ADUs?
In Livingston County’s unincorporated areas, there is no zoning ordinance, so ADUs are not regulated at the county level. State building codes, septic rules, and floodplain standards are the main considerations. Incorporated cities like Chillicothe may have zoning codes that permit ADUs, often with specific size restrictions and setback requirements for placement on the lot. If your property is outside city boundaries, contact the Livingston County County Commission before proceeding to ensure compliance.
Does Macon County, Missouri, Allow ADUs?
Macon County does not operate under countywide zoning for unincorporated areas, so there is no direct regulation of ADUs at the county level. Rural properties must comply with state building laws, septic approvals, and any floodplain restrictions. In incorporated municipalities such as Macon, the local zoning code will determine whether an ADU is possible and may set limits on structure size, height, and placement from property lines. For rural locations, your next step is to reach out to the Macon County Commission to confirm what’s required.
Does Madison County, Missouri, Allow ADUs?
Madison County has no zoning ordinance covering unincorporated areas, leaving ADUs unregulated at the county level in rural zones. Building codes, septic approvals, and floodplain compliance are still necessary. If you are inside a city such as Fredericktown, ADU allowances will be determined by the municipal zoning code, which often includes requirements for setbacks, height, and maximum square footage. Rural property owners should coordinate with the Madison County Commission before starting an ADU project.
Does Maries County, Missouri, Allow ADUs?
In Maries County, there is no countywide zoning ordinance for unincorporated areas, so ADUs are not directly addressed at the county level. Rural homeowners must still comply with Missouri building codes, obtain septic system approval, and follow any floodplain requirements. If your property is in a municipality such as Vienna, the city’s zoning rules will determine whether ADUs are allowed and may set specific requirements for setbacks, structure height, or maximum square footage. For those in unincorporated areas, it’s best to confirm with the Maries County County Commission before moving forward.
Does Marion County, Missouri, Allow ADUs?
Marion County does not enforce zoning regulations for unincorporated areas, meaning ADUs are not regulated locally outside of municipalities. In rural areas, you’ll need to follow state building standards, secure septic approval, and ensure compliance with floodplain regulations. If you are in a city like Hannibal or Palmyra, local zoning ordinances will dictate whether ADUs are permitted, often specifying setback distances, building height limits, and maximum allowable size. Rural property owners should contact the Marion County Commission to confirm the steps required for approval.
Does McDonald County, Missouri, Allow ADUs?
McDonald County does not have a countywide zoning ordinance for unincorporated areas, leaving ADUs unregulated at the county level in rural zones. Construction must still meet state building requirements, septic system rules, and floodplain standards. Within incorporated towns such as Anderson or Noel, the local zoning code will determine if an ADU is possible and outline details like minimum lot size, setback requirements, and height restrictions. Those outside city limits should consult the McDonald County Commission before starting an ADU project.
Does Mercer County, Missouri, Allow ADUs?
In Mercer County, unincorporated areas are not covered by county zoning regulations, so there is no local law specifically allowing or restricting ADUs. State building codes, septic approvals, and floodplain compliance remain essential. If your property is located in a city such as Princeton, the municipal zoning code will decide whether ADUs are allowed and may include requirements for building placement, setbacks, and square footage. For rural parcels, the best approach is to check with the Mercer County Commission before beginning construction.
Does Miller County, Missouri, Allow ADUs?
Miller County does not regulate unincorporated areas through county zoning, which means ADUs are not specifically addressed at the county level. Rural property owners must follow Missouri’s building standards, obtain septic system approval, and comply with floodplain rules if applicable. Inside cities such as Eldon or Lake Ozark, ADU rules will be set by the local zoning ordinance, often including specific requirements for setbacks, height, and maximum size. For rural projects, confirm details with the Miller County Commission before starting work.
Does Mississippi County, Missouri, Allow ADUs?
In Mississippi County, there is no countywide zoning ordinance for unincorporated areas, so ADUs are not regulated locally outside of municipalities. Rural property owners still need to comply with Missouri building codes, obtain septic approval, and meet any floodplain requirements. If your property is inside a city such as Charleston, the municipal zoning code will determine whether ADUs are allowed and may specify setback distances, maximum structure height, and lot coverage limits. For those outside city limits, it’s best to confirm requirements with the Mississippi County Commission before beginning construction.
Does Moniteau County, Missouri, Allow ADUs?
Moniteau County does not have zoning regulations for unincorporated areas, which means ADUs are neither expressly allowed nor prohibited at the county level. In rural locations, you must follow state building standards, secure septic approval, and ensure compliance with any floodplain restrictions. If the property is within a municipality such as California, the city’s zoning ordinance will outline whether ADUs are permitted and may include rules for placement, size, and height. Rural property owners should consult the Moniteau County Commission to verify requirements before starting a project.
Does Monroe County, Missouri, Allow ADUs?
In Monroe County’s unincorporated areas, there is no county zoning ordinance, so ADUs are not addressed in local regulations. State building codes, septic system rules, and floodplain regulations still apply. Inside incorporated communities such as Paris or Monroe City, the municipal zoning code will decide whether ADUs are allowed and may provide specifics on setbacks, lot size, and building height. For rural properties, the next step is to contact the Monroe County Commission to confirm compliance requirements.
Does Montgomery County, Missouri, Allow ADUs?
Montgomery County does not regulate land use in unincorporated areas through zoning, so there are no county-level rules for ADUs in rural zones. Building an accessory dwelling will require adherence to Missouri construction standards, septic system regulations, and any floodplain guidelines. Within municipalities like Montgomery City or Wellsville, the local zoning code will determine whether ADUs are allowed and may establish rules for size, placement, and utility connections. For properties outside city limits, coordinate with the Montgomery County Commission before proceeding.
Does Morgan County, Missouri, Allow ADUs?
Morgan County lacks a countywide zoning ordinance for unincorporated areas, leaving ADUs unregulated locally in rural zones. State building laws, septic approvals, and floodplain compliance remain necessary. If your property is within a city such as Versailles or Laurie, ADU allowances will be determined by the municipal zoning code, which may include requirements for setbacks, maximum square footage, and building height. For rural parcels, the best approach is to contact the Morgan County Commission to ensure your project meets all applicable standards.
Does New Madrid County, Missouri, Allow ADUs?
Property owners in New Madrid County who are exploring the idea of adding an ADU will find that there is no countywide zoning for unincorporated areas. Without a local ordinance, these projects are evaluated under Missouri’s building codes, septic system regulations, and any floodplain standards that may apply. Within incorporated cities like New Madrid or Portageville, zoning codes may allow ADUs but often include rules on lot size, setbacks, and overall building footprint. Anyone planning in the unincorporated county should start by speaking with the New Madrid County Commission to confirm what approvals are necessary.
Does Newton County, Missouri,Allow ADUs?
Newton County manages certain land uses through zoning in unincorporated areas, and in some rural or agricultural zones an ADU can be permitted as a secondary residence if it meets specific requirements. These often include minimum lot sizes, setback distances from property lines, and utility connection standards. In residential zones, ADUs may be more restricted and could require a conditional use permit. Building codes and health department rules still apply in every case. To understand your exact options, it’s best to contact the Newton County Planning and Zoning Department for details tied to your zoning district.
Does Nodaway County, Missouri, Allow ADUs?
In Nodaway County, unincorporated areas are not covered by a countywide zoning ordinance, so there are no local regulations specifically for ADUs in rural zones. That doesn’t mean there are no rules—state construction standards, septic approvals, and floodplain restrictions must still be followed. Inside municipalities such as Maryville, local zoning will control ADU eligibility and may set rules for maximum size, height, and placement on the lot. For rural projects, property owners should coordinate with the Nodaway County Commission before committing to construction.
Does Oregon County, Missouri, Allow ADUs?
Oregon County does not enforce zoning in unincorporated areas, leaving ADUs without direct local regulation in rural zones. Any construction still has to meet Missouri’s building requirements, septic system standards, and floodplain rules. If your land is inside an incorporated city such as Alton, ADU requirements will come from that city’s zoning code, which could include setback, lot coverage, and design standards. In rural Oregon County, the safest route is to confirm with the county health department and the County Commission to avoid compliance issues.
Does Osage County, Missouri, Allow ADUs?
Residents of Osage County considering an accessory dwelling should be aware that the county has no zoning ordinance for unincorporated areas. This means there’s no specific county rule allowing or restricting ADUs in rural zones, but state building laws, septic requirements, and floodplain guidelines still apply. Within incorporated areas like Linn, the city’s zoning code will set out ADU rules, potentially specifying size limits, placement from property lines, and utility standards. For rural landowners, checking with the Osage County Commission is the first step before starting any work.
Does Ozark County, Missouri, Allow ADUs?
In Ozark County, there is no countywide zoning for unincorporated areas, so ADUs are not directly addressed at the county level. Rural property owners still need to meet Missouri building codes, secure septic system approval, and follow any floodplain requirements that apply. If your land is inside an incorporated community such as Gainesville, the municipal zoning code will determine whether ADUs are allowed and may include rules for setbacks, maximum height, or lot coverage. For rural parcels, your best step is to coordinate with the Ozark County Commission before starting construction.
Does Pemiscot County, Missouri, Allow ADUs?
Pemiscot County does not regulate land use in unincorporated areas through zoning, leaving ADUs unregulated at the county level in rural zones. State building standards, septic requirements, and floodplain guidelines must still be followed. Within cities such as Caruthersville or Hayti, the municipal zoning ordinance will control ADU allowances and may outline requirements for structure size, placement from property lines, and utility connections. If you’re outside city limits, confirm all project details with the Pemiscot County County Commission before moving ahead.
Does Perry County, Missouri, Allow ADUs?
Perry County does not operate under countywide zoning for unincorporated areas, meaning there are no county-specific rules that allow or prohibit ADUs in rural zones. However, any construction must comply with Missouri building codes, septic system regulations, and floodplain restrictions. If your property lies inside an incorporated municipality like Perryville, the city’s zoning code will govern ADU eligibility and likely include setback, height, and size limits. Rural property owners should consult the Perry County Commission before breaking ground.
Does Pettis County, Missouri, Allow ADUs?
Pettis County has zoning regulations in place for some unincorporated areas, and ADUs may be permitted depending on the zoning district. In agricultural or rural residential zones, a secondary dwelling is often allowed if it meets standards for minimum lot size, setbacks, and utility connections, while denser residential zones may require a conditional use permit. All ADUs must comply with building and health codes. To determine your property’s eligibility, contact the Pettis County Zoning and Planning Department for district-specific requirements.
Does Phelps County, Missouri, Allow ADUs?
Phelps County does not maintain zoning for unincorporated areas, so ADUs are not directly regulated outside of municipal boundaries. State building laws, septic approvals, and floodplain rules will still apply. If you are within a city like Rolla or St. James, the municipal zoning code will set ADU standards, which may include rules for structure height, minimum setbacks, and allowable square footage. For rural projects, reach out to the Phelps County Commission to verify requirements before beginning construction.
Does Pike County, Missouri, Allow ADUs?
Pike County does not have a countywide zoning ordinance for unincorporated areas, so ADUs are not specifically regulated outside of municipalities. Rural property owners will need to follow Missouri building codes, obtain septic system approval, and meet any floodplain requirements. If you are within an incorporated area such as Bowling Green or Louisiana, the city’s zoning code will determine whether ADUs are permitted and may specify minimum setbacks, maximum building height, and lot coverage limits. For rural parcels, it’s best to confirm requirements with the Pike County Commission before beginning construction.
Does Platte County, Missouri, Allow ADUs?
It is unclear at this point, but it is very possible. Platte County enforces zoning regulations in unincorporated areas, and ADUs may be allowed depending on the zoning district. In some agricultural and rural residential zones, a secondary dwelling can be permitted if it meets minimum lot size requirements, required setbacks from property lines, and utility connection standards. More densely zoned residential districts may have tighter restrictions or require a conditional use permit. Building and health codes apply in all cases. To ensure compliance, contact the Platte County Planning and Zoning Department for the exact rules in your zoning category.
Does Polk County, Missouri, Allow ADUs?
Like other Missouri counties, Polk County does not operate under a countywide zoning ordinance for unincorporated areas, leaving ADUs unregulated at the county level in rural zones. All construction must still adhere to Missouri building codes, septic regulations, and floodplain rules. Within municipalities such as Bolivar or Fair Play, the city’s zoning ordinance will control whether ADUs are permitted and often includes details on setbacks, structure size, and lot coverage. Rural property owners should coordinate with the Polk County Commission before starting an ADU project.
Does Pulaski County, Missouri, Allow ADUs?
As of right now, Pulaski County has no zoning ordinance for unincorporated areas, so the county does not explicitly allow or prohibit ADUs in rural zones. That said, you must still comply with state building standards, septic approvals, and floodplain requirements. If your property is within an incorporated city like Waynesville or St. Robert, the city’s zoning code will set ADU standards, which may cover setbacks, maximum height, and minimum lot size. For rural parcels, it’s important to verify requirements with the Pulaski County Commission before proceeding.
Does Putnam County, Missouri, Allow ADUs?
Currently, Putnam County does not enforce countywide zoning in unincorporated areas, so ADUs are not regulated locally in rural zones. State building codes, septic system rules, and floodplain guidelines still apply. If your property lies within a municipality such as Unionville, the local zoning code will govern ADU allowances and likely outline setback distances, building height limits, and lot coverage restrictions. For rural landowners, the recommended next step is to contact the Putnam County Commission to ensure your project meets all applicable requirements.
Does Ralls County, Missouri, Allow ADUs?
Ralls County does not have a countywide zoning ordinance for unincorporated areas, which means there are no local rules specifically governing ADUs in rural zones. You will still need to follow Missouri’s building codes, obtain septic approval, and meet any floodplain requirements. If your property is located inside a municipality such as New London or Perry, the city’s zoning code will determine whether an ADU is allowed and may set standards for setbacks, maximum building height, and allowable square footage. Rural property owners should coordinate with the Ralls County Commission before starting construction.
Does Randolph County, Missouri, Allow ADUs?
Randolph County’s unincorporated areas are not subject to countywide zoning, so ADUs are not directly regulated at the county level. State building standards, septic requirements, and floodplain rules still apply. If you live within a city such as Moberly, the municipal zoning code will dictate whether ADUs are permitted and could include conditions for lot size, placement from property lines, and height restrictions. For rural projects, the best step is to confirm requirements with the Randolph County Commission.
Does Ray County, Missouri, Allow ADUs?
Ray County does not operate under a countywide zoning ordinance for unincorporated areas, leaving ADUs without direct local regulation in rural zones. Any new dwelling must meet Missouri building codes, septic system regulations, and floodplain guidelines. If your property is inside a city like Richmond or Orrick, ADU eligibility will be determined by the municipal zoning code, which may outline setback distances, maximum building height, and other dimensional requirements. Rural landowners should work with the Ray County Health Department and County Commission to ensure compliance.
Does Reynolds County, Missouri, Allow ADUs?
In Reynolds County, there is no zoning ordinance for unincorporated areas, meaning the county does not specifically allow or prohibit ADUs in rural locations. You will still be required to follow Missouri’s building standards, obtain septic system approval, and adhere to floodplain regulations. Inside incorporated municipalities such as Ellington or Bunker, the local zoning code will control whether ADUs are allowed and may specify placement, size, and design requirements. Rural property owners should contact the Reynolds County Commission before proceeding with construction.
Does Ripley County, Missouri, Allow ADUs?
Ripley County does not have countywide zoning for unincorporated areas, so ADUs are not locally regulated in rural zones. Any construction must still comply with state building codes, septic approvals, and floodplain standards. If your property is in an incorporated city like Doniphan, the city’s zoning ordinance will determine ADU allowances and may include setback, height, and lot coverage rules. Those outside city limits should confirm all project requirements with the Ripley County Commission before starting work.
Does Saint Charles County, Missouri, Allow ADUs?
Saint Charles County has a zoning ordinance for unincorporated areas, and ADUs are addressed under its accessory use provisions. In certain residential and agricultural districts, a secondary dwelling may be allowed if it meets standards for maximum floor area (often limited to a percentage of the main dwelling), minimum lot size, and setbacks from property lines. Some cases require a conditional use permit. All ADUs must have proper utility connections and meet building and health codes. To ensure compliance, contact the Saint Charles County Planning and Zoning Division for details specific to your zoning district.
Does Saint Claire County, Missouri, Allow ADUs?
In Saint Clair County, there is no countywide zoning ordinance for unincorporated areas, so there are no local regulations directly allowing or prohibiting ADUs in rural zones. State building standards, septic requirements, and floodplain rules still apply. If you are inside an incorporated municipality such as Osceola, the city’s zoning code will determine whether ADUs are permitted and may include requirements for placement, size, and height. Rural property owners should verify all requirements with the Saint Clair County Commission before starting construction.
Does Saint Francois County, Missouri, Allow ADUs?
Saint Francois County has zoning regulations that apply to unincorporated areas, and ADU allowances depend on the zoning classification. In agricultural and some residential districts, a secondary dwelling unit can be permitted if it meets requirements for minimum lot size, setback distances, and floor area limitations. Residential zones with higher density may require a special use permit. All ADUs must comply with building codes, septic regulations, and utility standards. Property owners should contact the Saint Francois County Planning and Zoning Department to determine specific eligibility.
Does Saint Louis County, Missouri, Allow ADUs?
Saint Louis County enforces zoning in unincorporated areas, and while ADUs are generally allowed they are regulated under guesthouse or accessory dwelling provisions. Where allowed, they must meet restrictions on square footage, lot size, setbacks, and sometimes occupancy limits. A permit is required, and in certain districts a special use permit may also be necessary. Compliance with building codes, septic or sewer connections, and utility standards is mandatory. To confirm what’s possible for your property, speak with the Saint Louis County Department of Planning.
Does Sainte Genevieve County, Missouri, Allow ADUs?
Sainte Genevieve County does not have a countywide zoning ordinance for unincorporated areas, so ADUs are not specifically regulated outside municipal boundaries. Rural property owners must still comply with Missouri building codes, obtain septic approval, and follow any floodplain requirements. Inside municipalities such as Sainte Genevieve, the city’s zoning ordinance will determine whether ADUs are permitted and may set requirements for setbacks, lot coverage, and maximum square footage. If you are in the unincorporated county, the safest route is to confirm with the County Commission before starting your project.
Does Saline County, Missouri, Allow ADUs?
Saline County has no countywide zoning for unincorporated areas, meaning there are no local provisions directly governing ADUs in rural zones. State building laws, septic regulations, and floodplain rules still apply. If your property is inside an incorporated area like Marshall, the city’s zoning code will determine whether ADUs are allowed and could specify conditions for placement, size, and building design. Rural property owners should work with the Saline County Commission to ensure compliance before construction begins.
Does Schuyler County, Missouri, Allow ADUs?
Schuyler County does not operate under countywide zoning for unincorporated areas, so ADUs are not addressed in local rural regulations. You must still meet Missouri building standards, secure septic system approval, and adhere to floodplain management rules where applicable. Incorporated municipalities such as Queen City will have their own zoning codes, which may dictate ADU allowances and set requirements for setbacks, height, and lot size. Rural projects should be confirmed with the Schuyler County Commission.
Does Scotland County, Missouri, Allow ADUs?
In Scotland County, there is no countywide zoning ordinance for unincorporated areas, leaving ADUs without specific local rules in rural zones. State construction laws, septic requirements, and floodplain guidelines still apply. If your property is in a municipality like Memphis, the city’s zoning code will decide whether ADUs are allowed and may include rules on lot size, placement, and maximum structure dimensions. Rural property owners should coordinate with the Scotland County Commission before beginning any work.
Does Scott County, Missouri, Allow ADUs?
Scott County does not have zoning regulations for unincorporated areas, so there are no county-level rules directly governing ADUs outside of cities. Missouri’s building standards, septic approvals, and floodplain restrictions will still apply. Inside municipalities such as Sikeston or Benton, local zoning ordinances will control ADU eligibility and may establish setback distances, maximum building height, and square footage limits. Rural landowners should confirm all requirements with the Scott County Commission before moving forward.
Does Shannon County, Missouri, Allow ADUs?
Shannon County does not maintain a countywide zoning ordinance for unincorporated areas, so ADUs are not specifically addressed in rural zones. Any construction must still comply with Missouri building codes, septic system requirements, and floodplain regulations. If the property is inside an incorporated municipality such as Eminence, the city’s zoning code will determine whether ADUs are permitted and may set standards for lot size, setbacks, and maximum height. For rural projects, property owners should check with the Shannon County Commission before moving forward.
Does Shelby County, Missouri, Allow ADUs?
Shelby County has no countywide zoning for unincorporated areas, leaving ADUs unregulated at the county level outside of cities. Rural homeowners must still meet state building codes, septic system regulations, and any applicable floodplain rules. Within municipalities like Shelbina or Clarence, the local zoning code will dictate ADU eligibility and may outline requirements for building placement, lot coverage, and square footage. Before construction in rural areas, contact the Shelby County Commission to verify what’s needed.
Does Stoddard County, Missouri, Allow ADUs?
In unincorporated Stoddard County, there are no county-level zoning regulations, so rural property owners won’t find ADU rules written into local code. That doesn’t mean you can build without oversight as building laws, septic system standards, and floodplain restrictions still apply. If your property is inside a municipality such as Dexter or Bernie, the city’s zoning ordinance will govern whether an ADU is permitted and outline requirements like setbacks, height limits, or maximum size. For rural parcels, coordinate early with the County Commission to confirm all permitting and compliance steps before moving forward.
Does Stone County, Missouri, Allow ADUs?
Stone County does regulate land use in unincorporated areas, and ADUs may be allowed depending on the zoning district. Agricultural and certain residential zones often permit them, provided you meet minimum lot size requirements, setback distances, floor area limits, and connect to approved utilities. In some cases, a conditional use permit will be needed. Regardless of location, ADUs must comply with building codes and health department rules. The Stone County Planning and Zoning Department can confirm whether your property’s zoning classification allows an ADU and outline any additional conditions.
Does Sullivan County, Missouri, Allow ADUs?
In rural Sullivan County, there is no countywide zoning, so ADUs aren’t specifically addressed in unincorporated areas. State building standards, septic approvals, and floodplain management rules still apply. If you’re inside a city like Milan, the municipal zoning ordinance will determine if ADUs are allowed and, if so, establish requirements for placement, size, and design. Rural property owners should consult the Sullivan County County Commission to ensure compliance before starting construction.
Does Taney County, Missouri, Allow ADUs?
Yes, it is definitely possible. Taney County enforces zoning in unincorporated areas, and ADUs are possible in certain districts particularly rural residential and agricultural zones. These usually require adherence to minimum lot size, setback rules, square footage limits in relation to the primary dwelling, and approved utility connections. In higher-density residential zones, a conditional use permit may be required. All ADUs must meet applicable building and health codes. To be sure your parcel qualifies, contact the Taney County Planning and Zoning Department for property-specific guidance.
Does Texas County, Missouri, Allow ADUs?
Texas County has no countywide zoning for unincorporated areas, so rural ADU projects are not directly regulated at the county level. You’ll still need to follow Missouri building laws, get septic system approval, and comply with floodplain restrictions. Within cities such as Houston or Cabool, municipal zoning codes control ADU allowances and may set rules for setbacks, size, and height. For rural builds, work with the Texas County County Commission before committing to a design or construction plan.
Does Vernon County, Missouri, Allow ADUs?
Because Missouri does not have county-wide ADU regulations, Vernon County has no countywide zoning ordinance for unincorporated areas, meaning ADUs are not locally regulated outside city limits. In incorporated areas such as Nevada, the city’s zoning code will determine ADU allowances and likely specify requirements for placement, square footage, and height. For rural parcels, the next step is to confirm compliance needs with the Vernon County Commission.
Does Warren County, Missouri, Allow ADUs?
Warren County does not regulate unincorporated areas through a countywide zoning ordinance, so ADUs are not specifically addressed in rural zones. State construction laws, septic approvals, and floodplain guidelines still apply. Inside municipalities such as Warrenton, the local zoning ordinance will control whether ADUs are permitted and may outline requirements for minimum lot size, setbacks, and allowable square footage. To find out more relevant information, it is important to reach out to the Warren County Planning Department.
Does Washington County, Missouri, Allow ADUs?
Following the pattern of other Missouri counties, Washington County does not have zoning regulations for unincorporated areas, leaving ADUs unregulated at the county level in rural zones. Missouri’s building standards, septic system approvals, and floodplain rules must still be followed. If the property is inside an incorporated city like Potosi, the municipal zoning ordinance will set ADU standards, which may include lot coverage limits, setbacks, and design criteria. Rural property owners should consult the Washington County Commission to ensure their plans meet all applicable requirements.
Does Wayne County, Missouri, Allow ADUs?
At this time, Wayne County does not operate under countywide zoning for unincorporated areas, so there are no local rules specifically allowing or prohibiting ADUs in rural zones. Construction must still comply with Missouri building codes, septic system regulations, and floodplain requirements. Inside municipalities such as Piedmont, the local zoning code will dictate whether ADUs are allowed and may specify conditions for structure size, placement, and utility connections. For rural properties, it’s best to confirm requirements with the Planning Commission before beginning construction.
Does Webster County, Missouri, Allow ADUs?
It is unclear at this point as Webster County enforces zoning regulations in unincorporated areas, and ADUs may be possible depending on the zoning classification. Agricultural and certain residential districts may allow a secondary dwelling if it meets minimum lot size requirements, prescribed setbacks, and maximum square footage limits, often tied to the size of the primary residence. In more restrictive zones, a conditional use permit may be necessary. All ADUs must comply with building and health codes. Contact the Webster County Planning and Zoning Department to verify the specific rules for your property.
Does Worth County, Missouri, Allow ADUs?
Like all other Missouri counties, Worth County does not have a countywide zoning ordinance for unincorporated areas, so ADUs are not regulated locally outside city limits. All Missouri building codes, septic approvals, and floodplain requirements must still be met. If your property is in an incorporated municipality such as Grant City, the city’s zoning ordinance will determine whether ADUs are permitted and may include other specific requirements for maximum size and height. Rural property owners should speak with the Zoning Department before proceeding.
Does Wright County, Missouri, Allow ADUs?
Wright County does not operate under countywide zoning for unincorporated areas, meaning ADUs are not specifically governed at the county level in rural zones. You’ll still need to follow Missouri building codes, secure septic system approval, and comply with floodplain standards. If located within a city like Mountain Grove or Hartville, the municipal zoning ordinance will dictate ADU eligibility and often sets setback distances, height restrictions, and square footage limits. For rural projects, it’s recommended to confirm all requirements with the County Commission before construction.
Accessory Dwelling Unit Requirements by Municipality
| Branson | Code of Ordinances | Branson, MO | Municode Library |
| Columbia | Code of Ordinances | Columbia, MO | Municode Library |
| Jefferson City | Planning and Zoning Division |
| Kansas City | Code of Ordinances |
| Lake Ozark City | Planning and Zoning |
| Springfield | Springfield, MO, Code of Ordinances |
| St. Joseph | Code of Ordinances | St. Joseph, MO | Municode Library |
| St. Louis | Code of Ordinances | St. Louis, MO | Municode Library |
Does Branson, Missouri Allow ADUs?
No. Unfortunately, Branson’s zoning code strictly forbids accessory structures for dwelling purposes and anything built as an accessory must not be used to live in. So, if you’re planning a livable ADU, you’re up against a hard no. The only way around this zoning code is to reach out to Branson’s planning or zoning staff to confirm if any amendments or conditional exceptions exist. They may permit you to request a variance or special-use permit for your modular ADU.
Does Columbia, Missouri, Allow ADUs?
Yes! Columbia allows ADUs, with certain restrictions. You can only build them in R‑2 or higher zoning districts, not R‑1 unless you get a Conditional Use Permit. The zoning codes also require a minimum lot width of 50 ft and at least a 6ft setback. Maximum size is capped at 75% of your homes’ square footage or up to 800 square feet.
You must acquire a building permit for your ADU before proceeding further. Contact the Columbia Building Department to find out more.
Does Jefferson City, Missouri, Allow ADUs?
It is unclear at this time. The code only permits accessory structures like garages — not living spaces. ADUs simply aren’t recognized. The language is vague and unhelpful if your goal is habitable space. Your best step is to contact the zoning department and ask if any variance or new policy is in the works.
Does Kansas City, Missouri, Allow ADUs?
Yes! Kansas City does allow ADUs, both attached and detached, provided the owner lives in one of the units and it’s not used for short-term rentals. Minimum lot width is 50 ft and minimum lot area is 5,000 square feet. Additionally, ADUs must fit the neighborhood’s scale and architectural character. Permits are required, and you’ll need to follow building code, setback, and design rules. If that sounds manageable, talk to the Kansas City Community Development office and they can walk you through the application.
Does Lake Ozark City, Missouri, Allow ADUs?
No. Accessory structures are regulated, but ADUs are outright prohibited. Local ordinance states: “No accessory structure shall be used for dwelling purposes” Your best move is to check with the Lake Ozark planning department if there are any conditional options or upcoming zoning revisions, though none are currently on record.
Does Springfield, Missouri, Allow ADUs?
As of now, Springfield only permits generic accessory structures over 100 square feet but those are clearly not residential. ADUs aren’t in the code yet. That said, they’re under active consideration as accessory dwelling units have come up in recent council debates as part of the community development code update. The council hasn’t signed off on an ADU policy yet so or now, you can’t build them, but keep an eye on that revision process and lobby if needed. You can also reach out to the Springfield Planning and Zoning Committee to see if you can get a special-use permit in the meantime.
Does St. Joseph, Missouri Allow ADUs?
It is possible. City rules require permits for accessory structures, but there’s no allowance for living spaces so ADUs aren’t explicitly mentioned under current code. Your next step is to ring up St. Joseph’s planning and zoning office to see whether there’s a process for exceptions or if they’re considering updates.
Does St. Louis, Missouri, Allow ADUs?
Not at this time, but potentially soon. ADUs are effectively illegal in St. Louis as the city imposes stringent rules that make building them nearly impossible. A 2023 bill aimed to allow them, and in July 2025, a new board bill attempted to reduce those barriers but nothing’s live yet. For now, you’re blocked, but there’s potential once the legislation moves through. Follow the city’s board bills closely and be ready to act when the new rules take effect. In the meantime, you can also contact the zoning department to see if there are any exceptions allowed.
Searching for an ADU Builder Serving Missouri?
Ready to take the next step towards owning a beautiful modular ADU? Zook Cabins is pleased to say we provide our skills and ADU package process anywhere in Missouri where ADUs are allowed! Simply contact us and talk to a sales representative or request a free quote to get the ball rolling.
We know that these days, it can be hard to choose who to work with to make your dreams become a reality. That’s why we promise transparent pricing, a commitment to the end, and an excellent work ethic. Choose Zook Cabins today and watch your vision of the ideal ADU unfold from start to finish.
Conclusion…
When it comes to ADU regulations, Missouri has a wide range of what is and is not allowed. However, when you work with a company like Zook Cabins, we have the expertise to help you figure out what will work best for you and your needs. So when you are ready to work with a company that can help you “Dwell Beyond the Ordinary”, get in touch with us and start creating memories that will last a lifetime today.