ADU Regulations in Indiana (IN)
Indiana is rated Difficult for ADU construction with an ADU-friendliness score of 30/100 (Restrictive). Indiana 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. Indiana has no statewide ADU legislation. ADU permissibility depends entirely on local zoning, which is generally restrictive in most jurisdictions. Indianapolis and Bloomington have some ADU provisions. Most suburban and rural areas lack ADU-specific regulations.
Full ADU Regulations Summary for Indiana
| 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 Indiana
ADU rules can vary by city even within the same state. Without a statewide ADU law, Indiana cities set their own rules, and policies can differ significantly. Below are ADU details for 3 cities in Indiana.
Indianapolis
ADUs allowed in some dwelling districts with conditional approval. Owner occupancy required. Maximum 40% of primary dwelling size.
Bloomington
ADUs permitted in residential zones. Bloomington has relatively permissive ADU rules for Indiana.
Fort Wayne
Limited ADU provisions. Requires variance or conditional use permit in most zones.
How Indiana Compares to Other States
Below is a comparison of Indiana with five states that have similar ADU-friendliness scores. This comparison helps illustrate where Indiana stands nationally.
| State | Score | Statewide Law | Parking Req? | Owner Occ? | Ease |
|---|---|---|---|---|---|
| Indiana (IN) | 30 | No | Yes | Yes | Difficult |
| Alabama (AL) | 30 | No | Yes | Yes | Difficult |
| Arkansas (AR) | 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 |
Frequently Asked Questions About ADUs in Indiana
Can I build an ADU in Indiana?
Yes, ADUs are allowed in Indiana. However, Indiana 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 Indiana?
Yes, Indiana 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 Indiana?
Indiana 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.
Do I need extra parking for an ADU in Indiana?
Indiana may require additional off-street parking for ADUs. The specific number of spaces depends on your local jurisdiction. This can be a significant barrier if your lot has limited space for parking.
Can I rent out my ADU in Indiana?
Yes, long-term rentals of ADUs are allowed in Indiana. Short-term rentals (like Airbnb) are also generally permitted, though your city may have separate short-term rental regulations.
How long does it take to get an ADU permit in Indiana?
The permitting timeline in Indiana is: Varies by jurisdiction. Without a statewide mandate, permitting timelines depend entirely on your local jurisdiction's review process. Actual timelines can be affected by plan review backlogs, inspection scheduling, and the complexity of your project. Pre-approved ADU plans, where available, can significantly speed up the process.
Check ADU Rules for Your City
Use our ADU regulations lookup tool to find the specific rules for your city in Indiana, or browse all 50 states to compare ADU regulations across the country. Remember that local rules may be more specific than state-level regulations.