ADU rules in Allen County, IN — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
In unincorporated Allen County, the Zoning Ordinance allows one accessory dwelling unit (ADU) per residential lot. An integrated ADU inside a single-family home must be at least 300 square feet, and only one freestanding ADU is permitted where there is no integrated unit.
The Allen County Zoning Ordinance (Title 3), administered by the Fort Wayne-Allen County Department of Planning Services, treats accessory dwelling units as a residential accessory use. A lot may have one primary single-family detached dwelling plus either one Type III manufactured home or one freestanding accessory dwelling unit, provided there is no integrated ADU on the lot. If instead the ADU is integrated into the single-family home, it must be at least 300 square feet. Inside Fort Wayne, New Haven, and other incorporated towns the city's own zoning controls; these rules govern the unincorporated county.
Building or occupying an ADU without an Improvement Location Permit, or a second freestanding dwelling where one is not allowed, is a zoning violation enforced by Planning Services with correction orders and fines.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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