ADU rules in Indiana
Representative cities: Indianapolis, Fort Wayne.
ADU permit rule
Permit requiredCase by casecity authority
Fee basis
Building permit fee set by the local building department; zoning/use approval also required.
Typical timeline
Varies
Setback
—
Area threshold
Not size-exempt
Exempt if
Not exempt
Go / no-go
case-by-case
ADUs are allowed only where local zoning permits an accessory dwelling unit. A building permit is required for construction. Verify with your city (e.g., Indianapolis BNS or Fort Wayne Community Development).
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Frequently asked questions
Do I need a permit to build an ADU in Indiana?
Per Indiana rules, an ADU is "yes" for a permit and the authority is "city". ADUs are allowed only where local zoning permits an accessory dwelling unit. A building permit is required for construction. Verify with your city (e.g., Indianapolis BNS or Fort Wayne Community Development). Always confirm with the issuing building department.
How big can an ADU be in Indiana?
Size limits for an ADU in Indiana are set by local zoning — verify with your city building department.
What are the ADU setbacks in Indiana?
Setback rules vary by city in Indiana; confirm with the local planning or building department.
How much does an ADU permit cost in Indiana?
Fee basis: Building permit fee set by the local building department; zoning/use approval also required.