1 county-level rule, plus city-specific rules for 1 city in Vanderburgh County, Indiana.
Verified from official government sources
Indiana has no statewide ADU mandate; the Evansville-Vanderburgh County Area Plan Commission regulates ADUs under the Unified Development Ordinance (UDO). ADUs are allowed only as accessory to a single-family home or duplex on lots of at least 5,000 sq ft, sized 400-800 sq ft (or 40% of the principal structure, whichever is greater), with mandatory owner occupancy of either the principal home or the ADU recorded by deed restriction.
1 cities in Vanderburgh County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Vanderburgh County Ordinance Hub →