ADU Regulations in South Carolina (SC)
South Carolina is rated Difficult for ADU construction with an ADU-friendliness score of 30/100 (Restrictive). South Carolina does not have a statewide ADU law — regulations are set entirely by local jurisdictions. Owner must reside on the property. Additional parking may be required. South Carolina has no statewide ADU legislation. ADU permissibility depends on local zoning. Charleston and Greenville have some ADU provisions. Most municipalities do not specifically address ADUs in their codes. HOA restrictions often further limit ADU construction.
Full ADU Regulations Summary for South Carolina
| ADUs Allowed | Yes |
| Statewide ADU Law | No |
| Maximum ADU Size | Set locally |
| Owner Occupancy Required | Yes |
| Parking Required | Yes |
| Minimum Setback | Set locally |
| Permitting Timeline | Varies by jurisdiction |
| Impact Fees | Varies by jurisdiction |
| Long-Term Rental Allowed | Yes |
| Short-Term Rental (Airbnb) Allowed | Yes |
| Ease of Building | Difficult |
ADU Regulations by City in South Carolina
ADU rules can vary by city even within the same state. Without a statewide ADU law, South Carolina cities set their own rules, and policies can differ significantly. Below are ADU details for 3 cities in South Carolina.
Charleston
ADUs (called 'carriage houses') permitted in some zones per historic precedent. Charleston has a tradition of secondary dwelling units. Design review may apply.
Greenville
ADUs allowed in certain residential zones with conditional approval. Greenville has been expanding ADU permissions.
Columbia
Limited ADU provisions. Requires conditional use permit in most zones.
How South Carolina Compares to Other States
Below is a comparison of South Carolina with five states that have similar ADU-friendliness scores. This comparison helps illustrate where South Carolina stands nationally.
| State | Score | Statewide Law | Parking Req? | Owner Occ? | Ease |
|---|---|---|---|---|---|
| South Carolina (SC) | 30 | No | Yes | Yes | Difficult |
| Alabama (AL) | 30 | No | Yes | Yes | Difficult |
| Delaware (DE) | 30 | No | Yes | Yes | Moderate |
| Georgia (GA) | 30 | No | Yes | Yes | Moderate |
| Idaho (ID) | 30 | No | Yes | Yes | Moderate |
| Illinois (IL) | 30 | No | Yes | Yes | Moderate |
Frequently Asked Questions About ADUs in South Carolina
Can I build an ADU in South Carolina?
Yes, ADUs are allowed in South Carolina. However, South Carolina does not have a statewide ADU law, so the specific rules depend on your city or county's zoning code. Some cities are more permissive than others. The ease of building is rated "Difficult" with a friendliness score of 30/100.
Do I need to live on the property to have an ADU in South Carolina?
Yes, South Carolina generally requires owner occupancy — the property owner must live either in the main house or the ADU. This means you cannot rent out both units simultaneously. Note: individual cities may have their own owner-occupancy rules, so check your local zoning.
How big can an ADU be in South Carolina?
South Carolina does not set a statewide maximum ADU size — this is determined by your local jurisdiction. Common local limits range from 600 to 1,200 square feet. Check your city's zoning code for the specific maximum.
How long does it take to get an ADU permit in South Carolina?
The permitting timeline in South Carolina is: Varies by jurisdiction. Without a statewide mandate, permitting timelines depend entirely on your local jurisdiction's review process.
Who decides ADU rules in South Carolina?
Your city or county — South Carolina has no statewide ADU statute, so zoning boards set the rules jurisdiction by jurisdiction. We track 3 South Carolina cities above (including Charleston); if yours isn't listed, the planning or zoning office is the authoritative source.
Check ADU Rules for Your City
Use our ADU regulations lookup tool to find the specific rules for your city in South Carolina, or browse all 50 states to compare ADU regulations across the country.