Indiana ADU Laws

No statewide ADU law - entirely local control. Indiana approaches ADUs through local zoning with significant variation between municipalities. Many major jurisdictions and rural counties have established paths for ADUs, treating them as permitted use in residential zones (AG, RR, R-1) or requiring special exceptions through Board of Zoning Appeals. Common requirements: ADU must remain subordinate to primary home, owner-occupancy required in one unit, size typically 220-900 sqft (Greenwood: max 30% of primary or 800 sqft whichever greater), height limited to 30 feet or primary structure height (whichever less). Benton County example: max 900 sqft, 2 bedrooms. No shared driveways/curb cuts allowed. ADUs can increase property values up to 35%. Local flexibility allows communities to tailor rules to neighborhood character - typical Midwest approach of local control over state mandates.