ADU rules in Dearborn, MI — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Michigan has no statewide ADU mandate, and Dearborn's zoning code generally does not authorize accessory dwelling units in single-family districts, though attached in-law arrangements may be possible.
Unlike California or Oregon, Michigan has not enacted statewide legislation requiring cities to allow accessory dwelling units. Dearborn's zoning ordinance historically restricts single-family residential districts to one dwelling unit per lot. Detached accessory structures such as garages, sheds, and pool houses are allowed but cannot include kitchens or be used as independent dwellings. Some homeowners create in-law suites within the primary dwelling, which generally must share utilities and access with the main residence and not be a separate rental unit. Conversion of garages, basements, or attics into independent rental apartments is not permitted without rezoning or variance. The Planning Department can provide specific guidance on district rules. Residents interested in ADU policy should follow planning commission agendas and state legislative activity on housing reform.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Wayne County.
See how other cities in Wayne County handle adu rules.
See how Dearborn's adu rules rules stack up against other locations.
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