ADU Regulations in South Dakota (SD)
South Dakota is rated Moderate for ADU construction with an ADU-friendliness score of 30/100 (Restrictive). South Dakota 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 Dakota has no statewide ADU law. Sioux Falls and Rapid City have some ADU provisions. The state's generally hands-off regulatory approach means ADU construction often depends on local building codes rather than zoning restrictions.
Full ADU Regulations Summary for South Dakota
| 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 | Moderate |
ADU Regulations by City in South Dakota
ADU rules can vary by city even within the same state. Without a statewide ADU law, South Dakota cities set their own rules, and policies can differ significantly. Below are ADU details for 2 cities in South Dakota.
Sioux Falls
ADUs allowed in residential zones with conditional use approval. Sioux Falls expanded ADU provisions in 2023.
Rapid City
ADUs permitted in certain zones. Requirements include owner occupancy and parking.
How South Dakota Compares to Other States
Below is a comparison of South Dakota with five states that have similar ADU-friendliness scores. This comparison helps illustrate where South Dakota stands nationally.
| State | Score | Statewide Law | Parking Req? | Owner Occ? | Ease |
|---|---|---|---|---|---|
| South Dakota (SD) | 30 | No | Yes | Yes | Moderate |
| 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 Dakota
Can I build an ADU in South Dakota?
Yes, ADUs are allowed in South Dakota. However, South Dakota 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 "Moderate" with a friendliness score of 30/100.
Do I need to live on the property to have an ADU in South Dakota?
Yes, South Dakota 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 Dakota?
South Dakota 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 Dakota?
The permitting timeline in South Dakota 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 Dakota?
Your city or county — South Dakota has no statewide ADU statute, so zoning boards set the rules jurisdiction by jurisdiction. We track 2 South Dakota cities above (including Sioux Falls); 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 Dakota, or browse all 50 states to compare ADU regulations across the country.