Whether you live in the bustling hub of Colombia, the charming streets of Charleston, or the quiet beauty of the countryside, South Carolina is a state known for its charm, historical significance, and welcoming community. South Carolina residents are always on the lookout for ways to keep housing affordable, which is why accessory dwelling units are gaining so much popularity.
Efficient, beautiful, and practical, these ADUs are independent living units that offer flexibility for homeowners. Whether you want to host family and friends or house your elderly parents, ADUs can increase your property value and offer investment options. Before purchasing though, it’s important to understand the regulations surrounding them. That’s what Zook Cabins is here for; to offer a clear guide on ADU regulations in South Carolina by county and municipality.
Are ADUs Allowed in South Carolina?
Yes, South Carolina is seeing more and more ADUs join the housing market as people catch a vision for them and recognize their potential. However, there is no state law governing ADUs which means their legalization is left up to the discretion of county and municipality governments. Practically speaking, this means that each county or municipality can and do vary in what they allow, size requirements, rental opportunities, etc. To make the process easy, we suggest building a good relationship with your local zoning and building departments. Their assistance will be crucial in navigating this process.
What is Considered An ADU in South Carolina?
South Carolina follows the standard definition of an ADU which is an independent living unit designed with its own sanitation, cooking, sleeping, and living areas. These can look like garage and attic conversions, additions built on to a main home, or detached ADUs, also known as backyard cottages.
Can Park Model Tiny Homes Be Used As ADUs?
It depends. Park model homes are our version of tiny homes on wheels, and they are crafted to the standards of a fully certified RV. This means they are technically mobile, and some South Carolina areas may not recognize them as an ADU with a permanent foundation. However, some areas do allow them and your local zoning department can provide the clearest answer when it comes to these tiny homes as ADUs.
And if you don’t like what your municipality has to say about tiny homes, see what other states have to say about their use in the table below:
| AL | IL | MN | NC | TX |
| AZ | IN | MS | ND | UT |
| AR | IA | MO | OH | VT |
| CA | KS | MT | OK | VA |
| CO | KY | NE | OR | WA |
| CT | LA | NV | PA | WV |
| DE | ME | NH | RI | WI |
| FL | MD | NJ | SC | WY |
| GA | MA | NM | SD | |
| ID | MI | NY | TN |
Can Log Cabins Be Used As An ADU?
Yes! Cozy log cabins as an ADU can provide a classic feel to a modern concept. The biggest concern with using log cabins as ADUs is the size requirements. Zook Cabins provides several log cabin models that should fit well within most South Carolina regulations.
Can Modern Cabins Be Used As An ADU?
If you don’t want the classic feel of a traditional log cabin, a modern cabin might be more up your alley. Tasteful design with modern flair and the functionality and comfort of a log cabin is a powerful combination. Here again, you need to ensure it remains within the size requirements so it can get approved.
What is the Difference Between a Prefab ADU & a Modular ADU?
A modular ADU is constructed in sections and assembled on site. A prefab ADU is a general term for buildings built in factories or warehouses then delivered and installed on site. Think log cabin kits or fully assembled ADUs. Zook Cabins specializes in fully certified modular ADUs that are crafted in sections in our warehouse then assembled with precision on your location of choosing.
What is the Minimum Size for an Accessory Dwelling Unit?
There is no universal statewide minimum size for ADUs in South Carolina. Instead, minimum sizes are set locally. A standard minimum is 200-400 square feet, but your zoning department can verify this for you.
Can My ADU be Bigger Than My House?
No, ADUs are required to remain “accessory,” meaning they must be smaller and secondary to the main home. Most jurisdictions explicitly limit ADUs to a fraction of the primary residence’s size to maintain that relationship
How Close To My House Can I Build An ADU?
This varies by municipality, but there are typically minimum separation requirements for detached ADUs. For example, some local ordinances require at least 10 feet of distance between the ADU and the main house, along with standard setback rules from property lines.
Do You Need A Permit For An ADU in South Carolina?
Yes. ADUs require building permits, zoning approval, and inspections. You’ll typically need to submit a detailed site plan showing setbacks, utilities, and compliance with local zoning rules. South Carolina also enforces statewide building codes for safety and construction standards, which means you may also need electrical, plumbing, or HVAC permits.
Are There Any Incentives or Grants for ADUs in South Carolina?
Unfortunately, there is currently no widely available statewide ADU grant program. However, there are a few indirect opportunities like local housing programs (like CDBG funding) or state housing assistance that you may qualify for. There has also been recent legislative discussion around potential property tax incentives for ADUs, but these are not yet implemented.
Are Zook Cabin’s ADUs Built to Code?
Absolutely! ADUs in South Carolina must comply with the International Residential Code (IRC) and local building codes, and we design our ADUs to meet these requirements so they can pass inspections and permitting. You won’t have to worry about a thing, just sit back and let us handle the details.
Can an ADU Have Multiple Bedrooms and Bathrooms?
They sure can. As long as the unit meets local size limits and building codes, ADUs can include multiple bedrooms and bathrooms. Zook Cabins offers several one or two bedroom models for you to choose from.
Are ADUs A Good Investment?
In many cases, yes, but it depends on your location and goals. ADUs can increase your property value, offer flexible housing for family members and generate rental income if allowed. However, South Carolina often restricts short-term rentals and may require owner occupancy, so the financial upside depends heavily on local zoning rules.
If your goal is to increase property value or save on housing costs for your parents or adult children, ADUs are a perfect investment. Ready to talk through your options? Our team is happy to help!
What Counties in South Carolina Allow ADUs?
Does Greenville County, SC Allow ADUs?
In Greenville County, the answer is yes in parts of the county, but it really depends on whether you’re in unincorporated Greenville County and what your zoning district is. The county’s zoning ordinance recognizes ADUs in specific contexts; for example, in the Agricultural Preservation district it allows one detached accessory dwelling unit with a size limit of no more than 50% of the primary dwelling’s gross square footage, and it must be located in the side or rear yard, meet setbacks, and share a driveway.
If you want to move forward, start by confirming whether your property is in county jurisdiction versus inside a city like Greenville, Greer, Travelers Rest, etc., because city rules can be totally different. Then contact Greenville County Zoning with your address and ask for a zoning verification and the exact ADU pathway for your district.
Does Richland County, SC Allow ADUs?
It does somewhat, but it may be hard to have an actual ADU allowed. Richland County allows accessory dwellings in unincorporated areas when the property and proposal meet the county’s special requirements. The county’s ordinance limits you to one accessory dwelling per single-family home but it bans using a manufactured home as the accessory dwelling, and caps the accessory unit’s size at 500 square feet.
If you’re in unincorporated Richland County, your next step is to contact the county planning/zoning office with your address and confirm the accessory-dwelling standard that applies to your zoning district.
Does Charleston County, SC Allow ADUs?
Yes, Charleston County allows ADUs in unincorporated parts of the county, and it has clear guardrails in its zoning and land development regulations. County rules limit you to one accessory unit per zoning lot, and the heated gross floor area generally cannot exceed 800 square feet in residential districts.
Before you make or buy ADU plans, confirm whether your address is in unincorporated Charleston County or inside a city because city ADU programs can be very different. For unincorporated areas, your next step is to contact Charleston County Zoning & Planning for a zoning permit/zoning confirmation.
Does Horry County, SC Allow ADUs?
It is unlikely. Horry County does allow ADUs in at least some situations, but it’s very zoning-dependent and the county is particular about how a second unit sits on the lot. The county’s zoning ordinance includes ADU standards such as a minimum separation requirement of at least 20 feet from the principal dwelling for certain setups, which is a big placement detail that can make or break a smaller backyard plan.
Contact Horry County zoning/code enforcement with your address and ask whether an ADU is permitted in your zoning district and what size limits apply in that district.
Does Spartanburg County, SC Allow ADUs?
Yes, but it comes with stipulations. The county explicitly says second residential structures require prior approval and documentation of that approval before an address can be assigned and before building permits can be issued.
The best next step is to call or contact Spartanburg County Planning and Development with your address and ask what they consider your proposal as and what approvals you need before you submit for permits.
Does Lexington County, SC Allow ADUs?
In some areas, yes. Lexington County allows ADUs in certain zoning districts, but it is not a blanket allowance across the entire county. In many cases, the unit must stay clearly secondary to the main home and meet size limits tied to the primary residence, along with standard setbacks and placement requirements.
We recommend starting by confirming whether your property is in unincorporated Lexington County and identifying your zoning district. From there, contact the county zoning office with your address and ask if an ADU is permitted and what size limits apply, then move into a site plan and permitting process once you have a clear yes.
Does York County, SC Allow ADUs?
York County does allow ADUs in unincorporated areas, but they are typically limited and must meet specific standards. These usually include having only one ADU per lot, keeping the size smaller than the primary home, and following placement rules like being located behind or beside the main house.
Our suggestion is to first confirm your zoning district since rules can vary quite a bit. Then reach out to York County Planning to verify size limits and whether your ADU is allowed by right or needs approval before you invest in design work.
Does Berkeley County, SC Allow ADUs?
It depends. Berkeley County generally allows ADUs in certain residential and rural zoning districts, but they are regulated carefully. Size is often limited relative to the main home, and the unit must meet setback and utility requirements to qualify as a legal second dwelling.
We recommend confirming whether your property falls under county jurisdiction or inside a city like Summerville or Goose Creek. Once confirmed, contact Berkeley County Planning with your address to get clear guidance on size and placement before moving forward with plans.
Does Anderson County, SC Allow ADUs?
Because Anderson County takes a zoning-based approach, ADUs may be allowed depending on your district, but they are not guaranteed everywhere. In many cases, they are treated similarly to a second dwelling and must meet lot size, setback, and access requirements.
Our suggestion is to treat this like building a second small home on your property. Start by contacting Anderson County Planning to confirm if your lot qualifies and what size limits apply, then move into permitting once you know the project fits within county rules.
Does Beaufort County, SC Allow ADUs?
In some areas, yes, Beaufort County is favorable towards ADUs, but regulations can be strict, especially due to coastal development controls. Size is typically limited and tied to the primary residence, and placement must follow setback and design standards that fit the surrounding area.
We recommend confirming both county zoning and any community or HOA rules before moving forward, since those can impact what is allowed. From there, contact Beaufort County Planning to verify size limits and approval requirements, then proceed with a site plan and permit application once you have clear direction.
Does Aiken County, SC Allow ADUs?
Currently, Aiken County allows ADUs in certain situations, but it depends heavily on your zoning and how the structure is classified. In many cases, smaller secondary homes are permitted in rural or less dense districts, but they still need to meet setback rules and stay clearly secondary in size to the main home.
We recommend confirming your zoning first and asking the county whether your project will be treated as an ADU or a second dwelling. From there, move into a basic site plan and talk through size expectations with the planning office before submitting for permits.
Does Dorchester County, SC Allow ADUs?
Like many other South Carolina counties, Dorchester County does allow ADUs in some zoning districts, especially in more rural areas, but they are not automatically permitted everywhere. Size is typically limited relative to the primary residence, and placement rules like setbacks and lot coverage still apply.
Our suggestion is to verify whether your property is in unincorporated Dorchester County and not inside a town like Summerville. Then contact the county planning department with your address to confirm if an ADU is allowed and what size limits you need to stay within before designing anything.
Does Florence County, SC Allow ADUs?
Florence County takes a more flexible but still zoning-driven approach to ADUs. In many areas, they are allowed if the property meets minimum lot size requirements and the unit stays secondary to the main home, though there is not always a clearly defined universal size cap.
Start by confirming your district with Florence County Planning, then ask what size and placement requirements apply before moving into drawings and permits to avoid rework later.
Does Pickens County, SC Allow ADUs?
Following the same discretion as other counties, Pickens County generally allows ADUs in certain residential and rural districts, but the approval depends on your zoning and how the unit is structured. Because the regulations can vary so much by specific zoning district, it is hard to nail down specific guidelines for ADUs.
Our suggestion is to confirm your zoning and lot size early, since those are the biggest factors. Then reach out to Pickens County Planning to verify whether your ADU is allowed and what size limitations apply before moving forward.
Does Lancaster County, SC Allow ADUs?
Yes, Lancaster County allows ADUs in some cases, but they are not universally permitted across all zoning districts. Size is usually limited relative to the main home, and the unit must comply with setback and placement requirements.
We recommend starting with a zoning check through Lancaster County Planning to confirm eligibility. Once you know your property qualifies, you can move forward with a site plan and permitting process with a much clearer path.
Does Sumter County, SC Allow ADUs?
Sumter County allows ADUs in certain areas, but everything depends on zoning and how the structure is classified. There is not always a clearly defined countywide size cap, but the unit must stay smaller than the primary residence.
The best place to start is confirming whether your property is in unincorporated Sumter County and identifying your zoning district. From there, you can contact the county planning office to verify if an ADU is allowed and what size and placement limits apply before moving into permits.
Does Orangeburg County, SC Allow ADUs?
Yes! Orangeburg County is generally more flexible, especially in rural areas, and ADUs are often allowed depending on zoning. Here, they are simply viewed as a second house on your property which means you will run into some extra regulations.
Before moving forward, confirm your zoning district and ask how the county classifies your project. In many cases, the process is straightforward once zoning is confirmed, and you can proceed with a site plan and building permit application.
Does Oconee County, SC Allow ADUs?
Oconee County allows ADUs in certain residential and rural districts, but they are not automatically permitted everywhere. The ADU must always remain smaller than the primary dwelling and fit within the lot’s size and layout.
Start by checking your zoning and confirming whether your property falls under county jurisdiction or a municipality. Once that is clear, reach out to Oconee County Planning to verify what is allowed before moving into design and permitting.
Does Kershaw County, SC Allow ADUs?
Kershaw County takes a zoning-based approach, so ADUs may be allowed depending on your district and lot size. They are often treated similarly to a second dwelling and must meet standard development requirements like setbacks, access, and utilities, while remaining smaller than the primary residence.
We recommend confirming your zoning early in the process since that determines everything. Once you have that, you can work with the county planning office to confirm requirements and move forward with a site plan and permits.
Does Greenwood County, SC Allow ADUs?
Just like many of the other neighboring South Carolina counties, Greenwood County allows ADUs in some areas, particularly in rural or lower-density zones, but the regulations must be confirmed with the planning departments. The unit must remain secondary in size and function, and it must meet local setback and lot requirements.
Your next step is to confirm your zoning and speak with Greenwood County Planning to verify whether your property qualifies. Once approved at the zoning level, the process typically moves into site planning and building permits.
Does Laurens County, SC Allow ADUs?
Laurens County does not have a clearly defined, easy-to-find ADU ordinance, and most of the county code focuses more on manufactured housing and general residential use rather than explicitly allowing accessory dwelling units. Because of that, ADUs are typically handled case by case, often being treated more like a second dwelling or an accessory structure depending on how the project is designed.
Your next step is to contact Laurens County Zoning directly and ask how they would classify your specific plan. In many cases, approval will depend on your zoning district, and you may need to meet the same requirements as a second home on the property before moving forward.
Does Georgetown County, SC Allow ADUs?
Yes, it appears so! Georgetown County allows ADUs in certain situations, especially in rural or lower-density areas, but the rules are not clearly spelled out in a simple countywide standard. Like much of South Carolina, it comes down to zoning and whether the unit is considered a true accessory dwelling or a second residence.
The process starts with confirming your zoning district and whether your property is in unincorporated Georgetown County. From there, you can reach out to the county planning office to confirm size expectations and placement requirements before starting design work.
Does Darlington County, SC Allow ADUs?
Like its SC county neighbors, Darlington County does not clearly publish a dedicated ADU section in its zoning code, which usually means these projects are handled under broader residential or accessory structure rules. In practice, that often means the unit must remain secondary to the main home and comply with setbacks, utilities, and lot size requirements.
Before moving forward, it is important to confirm how the county will classify your project. Contact Darlington County Planning with your address and ask whether your ADU will be treated as an accessory unit or a second dwelling so you can plan accordingly.
Does Cherokee County, SC Allow ADUs?
Maybe. Cherokee County allows additional residential structures in some areas, but there is not a clearly defined, homeowner-friendly ADU ordinance. Most projects are reviewed based on zoning and may be treated as a second dwelling rather than a traditional ADU.
Start by confirming your zoning district and lot size, since those are the biggest factors. From there, reach out to Cherokee County Planning to verify what is allowed and what requirements your project must meet before applying for permits.
Does Chesterfield County, SC Allow ADUs?
Chesterfield County is another of those areas where ADU regulations are not clearly established, and in some cases the county is still working through how to handle smaller secondary housing types. Because of that, there is no consistent, widely published size standard or approval path.
This is a county where you will want to get clarity upfront. Contact Chesterfield County Planning and ask directly whether a detached or attached ADU is allowed on your property and what steps are required before moving into design and permitting.
Does Colleton County, SC Allow ADUs?
Colleton County does not have a clearly defined ADU section that is easy to point to, and most of the zoning code focuses on general residential uses rather than accessory housing specifically. In practice, this means ADUs may be allowed in some areas, especially rural zones, but they are often treated more like a second dwelling than a simple accessory unit.
Before moving forward, confirm your zoning district and whether your property is in an unincorporated area. A quick call to Colleton County Planning can clarify whether your project fits within current rules or if it will need additional approval.
Does Newberry County, SC Allow ADUs?
Based on the current public information available, Newberry County does not clearly outline ADUs in a straightforward way within its zoning code, which usually means they are reviewed under broader residential regulations. Fortunately, this typically means ADUs are allowed, the zoning codes just don’t have the language for it.
To find out for sure, reach out to Newberry County Planning to understand how they will classify your project before you begin designing.
Does Jasper County, SC Allow ADUs?
Just like most of South Carolina, Jasper County allows flexibility in rural and agricultural areas, but ADUs are not always clearly defined as a separate use in the code. Depending on your zoning, a secondary unit may be allowed, but it is often regulated similarly to a second residence rather than a traditional ADU.
You will want to confirm both zoning and any local development restrictions tied to your parcel. Contact Jasper County Planning with your address to verify whether your project is permitted and what requirements apply.
Does Chester County, SC Allow ADUs?
Chester County does not present a clearly defined ADU ordinance, and most regulations fall under general residential development rules. Because of this, ADUs are typically reviewed on a case-by-case basis and may be treated as a second dwelling depending on the setup.
The first step is identifying your zoning district and confirming whether your lot can support more than one dwelling. Once that is clear, the county planning office can guide you through the approval process and required permits.
Does Clarendon County, SC Allow ADUs?
It is possible but not clearly outlined. Clarendon County takes a more general approach to land use, and ADUs are not clearly outlined as a distinct category in publicly available zoning materials. This can mean that ADUs are allowed, but they may require a conditional use permit or simply be zoned under a different name.
To move forward, confirm your zoning and lot size, then check with Clarendon County Planning to see how your project will be classified. This step is important since approval often depends on how the county interprets your specific plan.
Does Williamsburg County, SC Allow ADUs?
As of right now, Williamsburg County does not clearly outline ADU in a well-defined way within its zoning materials. Most of the code focuses on general residential and rural uses, which means smaller secondary homes may be allowed in some areas, but they are usually reviewed as an additional dwelling rather than a standard ADU.
A quick conversation with Williamsburg County Planning will help you understand how your project will be classified and what requirements you will need to meet.
Does Marion County, SC Allow ADUs?
It isn’t very clear one way or the other. Marion County tends to be more flexible due to its rural nature, but it does not clearly publish a dedicated ADU ordinance. In many cases, a second living unit may be possible if the property meets minimum lot size and setback requirements, though it may be treated as a separate dwelling.
Start by checking your zoning and property classification, since that will drive what is allowed. From there, reach out to Marion County Planning to confirm whether your ADU concept fits within current rules before moving forward.
Does Dillon County, SC Allow ADUs?
Possibly. Dillon County does not have a clearly defined ADU section in its zoning code, which means these projects are typically handled under broader residential guidelines. A second unit may be allowed depending on zoning, but it often must meet the same standards as another primary structure on the property.
The best approach is to verify your zoning district and speak directly with Dillon County officials about your specific plan. This will help you avoid designing something that does not meet local requirements.
Does Edgefield County, SC Allow ADUs?
While Edgefield County allows a range of residential uses in rural areas, ADUs are not clearly spelled out as a separate category in the code. This lack of clarity simply means you will need to communicate directly with the county to find out what they don’t state online or in zoning codes.
Contact Edgefield County Planning to verify what is allowed on your property and what steps are required to get approval.
Does Union County, SC Allow ADUs?
Unfortunately, Union County does not clearly define ADUs in a way that gives homeowners a simple yes or no answer. Most secondary housing situations are handled under general residential zoning rules, which can allow flexibility but also simply require more direct communication with the county.
Start by confirming your zoning district and whether your lot can accommodate an additional unit. From there, the county planning office can guide you on whether your ADU is permitted and how to proceed with permits and approvals.
Does Marlboro County, SC Allow ADUs?
It is very likely. Marlboro County does not clearly spell out accessory dwelling units in its zoning materials, and most regulations focus on general residential and rural land use. Because of that, a smaller secondary home is usually reviewed as an additional dwelling rather than a true ADU with its own defined standards. This is just a difference of terms, and your ADU will most likely be approved, although you probably won’t be able to rent it out.
The county planning office can clarify how your project will be classified and what requirements you need to meet before applying for permits.
Does Abbeville County, SC Allow ADUs?
While Abbeville County leans toward flexibility in rural zones, it does not have a clearly defined ADU ordinance that lays out size limits or placement rules in a simple way. In most cases, a second living unit may be allowed if it meets general requirements like setbacks, access, and utilities.
Reach out to Abbeville County Planning to confirm whether your ADU will be permitted and how it will be reviewed before beginning any design work.
Does Barnwell County, SC Allow ADUs?
Currently, Barnwell County does not clearly outline ADUs as a separate use in its zoning code, which means these projects are typically handled under more general zoning rules. Instead of being called an ADU, it will probably be zoned simply as a second dwelling.
Before making plans, verify your zoning and lot requirements. Contacting Barnwell County Planning early will help you understand whether your project is feasible and what steps are required to move forward.
Does Fairfield County, SC Allow ADUs?
It is very possible. Fairfield County allows a range of residential uses in its rural areas, but it does not clearly define ADUs in a straightforward way. This usually means a second unit may be possible, but it will be reviewed based on general zoning rules rather than a dedicated ADU framework.
It is important to confirm how the county will classify your project. Reach out to Fairfield County Planning with your property details so you can understand the requirements before starting the permitting process.
Does Saluda County, SC Allow ADUs?
Just like many other counties, Saluda County does not have a clearly published ADU ordinance, and most of its zoning guidance focuses on broader residential uses. Often, direct permission for ADUs is given at a municipality level in South Carolina.
Your next step should be to confirm your zoning and ask the county or your local zoning department how they interpret your project. Getting that clarity early will help you avoid delays when you move into site planning and permitting.
Does Hampton County, SC Allow ADUs?
As of right now, Hampton County does not clearly define ADUs in its zoning materials, and most guidance centers around general residential and rural land use. This usually means a second living unit may be possible, but it will be reviewed as an additional dwelling rather than a clearly permitted accessory unit, and there are no widely published size standards.
Speaking with Hampton County Planning will help clarify how your project will be classified and what requirements you will need to meet.
Does Lee County, SC Allow ADUs?
It is hard to know for sure. Lee County does not have a clearly outlined ADU ordinance, so projects like this are typically handled under broader residential zoning rules. In some cases, a secondary unit may be allowed if it meets lot size, setback, and utility requirements, but it is often treated like a second home.
Reach out to Lee County officials and they will help you determine whether your ADU is allowed and what steps are required before permitting.
Does Calhoun County, SC Allow ADUs?
Following the pattern of many SC counties, Calhoun County takes a general zoning approach, and ADUs are not clearly identified as a separate use in publicly available materials. This means approval often depends on whether the property can support an additional dwelling under existing zoning rules, rather than a specific ADU policy.
The first step is confirming your zoning and lot size. Once that is established, the county planning office can guide you on whether your project is feasible and how to proceed with approvals.
Does Bamberg County, SC Allow ADUs?
Unfortunately, Bamberg County does not clearly publish ADU-specific regulations, and most development rules fall under general residential zoning. This does not mean ADUs are illegal, it just means we can’t provide you with a clear answer as of right now.
For the most clarity, we suggest you confirm your zoning classification and speak with Bamberg County Planning. This will give you a clear understanding of whether your project fits within current rules.
Does McCormick County, SC Allow ADUs?
Even though McCormick County is more rural and flexible in some areas, it still does not clearly define ADUs in a straightforward ordinance. In many cases, a secondary living unit may be allowed if it meets general zoning requirements, though it may not be formally labeled as an ADU.
The county planning office can help determine whether your plan is permitted and what approvals are needed.
Does Allendale County, SC Allow ADUs?
It is unknown at this time. Allendale County does not have a clearly established ADU framework, and most land use rules are based on general residential and rural zoning. This means a second dwelling may be possible in some situations, but there are no widely published size limits or standardized ADU guidelines.
Before moving forward, verify your zoning and discuss your project directly with county officials. That conversation will help you understand how your ADU will be reviewed and what steps are required to move ahead.
Accessory Dwelling Unit Requirements by Municipality
| Charleston | Home PageADU Requirements |
| North Charleston | Home PageCode of Ordinances |
| Columbia | Home PageADU Requirements |
| Mount Pleasant | Home PageBuilding Regulations |
| Rock Hill | Home PagePlanning and Development |
| Greenville | Home PageBuilding and Permit Center |
| Summerville | Home PageCode of Ordinances |
| Goose Creek | Home PageBuilding Codes |
| Sumter | Home PageBuilding Department |
| Florence | Home PageBuilding Department |
| Spartanburg | Home PageCity Planning |
| Hilton Head Island | Home PageTiny House Regulations |
| Myrtle Beach | Home PageBuilding Regulations |
| Greer | Home PageBuilding Regulations |
| Aiken | Home PageBuilding Codes |
Does Charleston, SC Allow ADUs?
It sure does! Charleston is one of the clearest “yes” answers in South Carolina because the city has an established ADU program. The City Council approved an ordinance allowing ADUs as a conditional use in all base zoning districts, with an application process through the city planning department. One ADU per lot is allowed and the total number of dwelling units on the lot cannot exceed two. If you’re a homeowner who’s ready to move forward, your next step is to pull your property’s zoning and then use the City of Charleston ADU application/checklist process before you proceed any further.
Does North Charleston, SC Allow ADUs?
Potentially. North Charleston isn’t as clear right now because ADU allowances are in the works but nothing is definite yet. Your best next step is to contact the City of North Charleston Planning/Zoning team with your address and ask, in writing, whether a detached or internal ADU is permitted on your lot and what approvals are required before you apply for any building permits.
Does Columbia, SC Allow ADUs?
Yes! Columbia does allow ADUs, and runs them through specific standards that are tied to single-family detached lots. Under the city’s ordinance standards, an ADU is allowed only as accessory to a single-family detached dwelling, with no more than one ADU per lot. Columbia also includes an owner-occupancy requirement which means either the main home or the ADU must be the permanent, full-time residence of the owner. Next, you’ll need to verify your zoning with Columbia Planning & Development, then confirm whether you’re proposing an attached/internal ADU or detached ADU, and submit your plans for zoning review before pulling the building permit.
Does Mount Pleasant, SC Allow ADUs?
It does! Mount Pleasant is generally ADU-friendly in the sense that the town explicitly permits ADUs in a long list of zoning districts when conditions are met. The town’s published ADU requirements point homeowners to specific code sections and spell out that ADUs are permitted in multiple residential districts, subject to the town’s standards. Your next move should be to confirm your zoning district and talk to the Planning Department about size and height requirements.
Does Rock Hill, SC Allow ADUs?
Yes. The city’s zoning ordinance materials explicitly list “Accessory Dwelling Unit” as a permitted accessory use across multiple districts. Rock Hill’s rules include basic guardrails like minimum square feet (480 square feet) and district-based permissions. From a homeowner standpoint, your next steps should be to confirm your zoning district with Rock Hill Planning & Development, and ask staff which ADU standards apply to your lot.
Does Greenville, SC Allow ADUs?
Yes, but only with certain qualifications. In Greenville, ADUs are allowed under specific zoning conditions and not universally across every neighborhood. The city updated its development code to allow ADUs in certain zones, with limits like a maximum size around 1,000 sq. ft. or a percentage of the main home, plus requirements such as owner occupancy and additional parking. In some cases, rules differ between city limits and Greenville County, so you need to verify exactly where your property falls before assuming anything. Your next step should be to check your zoning through the City of Greenville Planning & Development Department, confirm whether ADUs are permitted “by right” or require approval, and then move into site planning and permitting once you know you’re eligible.
Does Summerville, SC Allow ADUs?
Summerville is more of a “depends on your zoning” situation, and you shouldn’t assume ADUs are automatically allowed without verification. The town does not have a simple, widely published blanket ADU allowance like Charleston, which means ADUs may be restricted, conditionally allowed, or handled under different accessory structure rules depending on your zoning district. In practical terms, this is a city where many homeowners hit roadblocks if they skip the zoning step. Your best move is to contact the Town of Summerville Planning & Zoning Department with your property address and ask whether a detached or attached ADU is permitted.
Does Goose Creek, SC Allow ADUs?
It can depend. Goose Creek falls into the category of cities where ADUs are not clearly promoted as a standard use, so approval is highly dependent on zoning interpretation and local ordinance details. That usually means ADUs may be limited to specific districts or may require special approval rather than being freely allowed. Because of that, homeowners should reach out to Goose Creek Planning & Zoning and ask specifically whether an accessory dwelling unit, guest house, or in-law suite is permitted and what the approval path looks like.
Does Sumter, SC Allow ADUs?
Sumter is another municipality where ADU rules are not clearly standardized across all residential areas, meaning they are typically controlled by zoning districts and local interpretation rather than a broad citywide program. In many cases, accessory living spaces may be allowed only if they don’t function as a completely independent dwelling, or they may require special approval to be classified as an ADU. The smart next step is to contact the City of Sumter Planning Department, confirm whether your property allows a second dwelling unit, and ask for written guidance on requirements like setbacks, utilities, and occupancy rules before submitting any building plans.
Does Florence, SC Allow ADUs?
Possibly, but we can’t say for sure. Florence leans toward a “case-by-case” approach, where ADUs are not universally permitted but may be allowed depending on zoning and how the structure is classified. Like most of South Carolina, everything hinges on local zoning and not state law. If you’re considering building here, your next step is to work directly with the City of Florence Planning, Research & Development Department to find out whether your lot allows an ADU and what size and placement limits apply.
Does Spartanburg, SC Allow ADUs?
Yes, but it looks a bit different. Spartanburg is a bit different from most cities because it doesn’t follow a traditional ADU ordinance model, instead, it allows what is essentially a second dwelling on the same lot if you meet all the development requirements. In practice, that means you can build an ADU, but it has to comply as if it were its own house which means setbacks, road frontage, and access all need to meet full standards. The smart way to approach Spartanburg is to treat your ADU like a second home on the property. We recommend you call the City of Spartanburg Planning Department and ask specifically what standards your second dwelling must meet before you design anything.
Does Hilton Head Island, SC Allow ADUs?
It is unlikely. Hilton Head is one of the toughest places in South Carolina to build an ADU, mainly because of strict zoning and neighborhood rules. The town prioritizes controlled development and aesthetics, so true detached ADUs are often limited or not allowed in many areas, especially if they function as a completely independent residence. If you’re serious about building here, your first move should be to check both the Town of Hilton Head zoning and your specific neighborhood/HOA rules. Start by contacting the town’s Community Development Department with your address as this is one of those locations where approval depends heavily on your exact property, not just citywide rules.
Does Myrtle Beach, SC Allow ADUs?
Yes, but only with very strict limitations. Myrtle Beach leans restrictive when it comes to ADUs, mostly because of density concerns and the city’s focus on tourism-driven development. ADUs are not broadly permitted across all residential zones, and in many cases, what is allowed are accessory structures that aren’t full independent living units. You typically won’t find a clear citywide size allowance like “800 sq. ft.” because approval depends on zoning classification first. If your property does allow something similar to an ADU, expect it to be limited in size relative to the main home and subject to standard setbacks. Your next step is to contact Myrtle Beach Planning & Zoning to see if an ADU on your lot is even possible.
Does Greer, SC Allow ADUs?
Yes! Greer is actually one of the more ADU-friendly cities in this group, and the rules are a lot clearer. The city allows ADUs in residential areas, but they’ve put solid guardrails in place to keep them secondary to the main home. Typically, the size is limited to the lesser of about 750 square feet or roughly one-third of the primary home, and the unit must be on the same lot and positioned behind or to the side of the main house. Owner occupancy is also commonly required, which matters if you’re thinking of rental income. Check your zoning, make sure your lot can physically meet setbacks, then submit a site plan to the City of Greer Planning Department before applying for a building permit.
Does Aiken, SC Allow ADUs?
Aiken falls into the category of cities where ADUs are not clearly standardized across all residential zones, so everything depends on how your property is zoned and how the structure is classified. In many cases, detached guest houses or accessory buildings may be easier to approve than fully independent ADUs with kitchens and separate utilities. Your next step is to contact the City of Aiken Planning Department to find out exact ADU requirements that may not be posted online.
Looking for an ADU Builder Serving South Carolina?
If you are ready to take the next step in finding an ADU builder you can trust, Zook Cabins is happy to offer you our experience and skill wherever you live in South Carolina. With decades of experience in the housing and nontraditional housing world, our Amish crafted ADUs are built to last but with your comfort and needs in mind. Simply contact us to talk with one of our representatives or request a free quote on a model you’ve been eyeing. Let us help you dwell beyond the ordinary.
And if South Carolina is starting to seem a bit more complicated for your ADUs thatn you had origonally anticipated, take a look at the table below and see if another state can fit your desires a bit more.