ADU rules in Ann Arbor, 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. Ann Arbor ADU policies depend on local zoning. Some Michigan cities have adopted ADU-friendly ordinances.
Michigan does not have a statewide ADU mandate. ADU permissibility depends entirely on Ann Arbor zoning code. Some Michigan cities (Ann Arbor, Grand Rapids, Detroit) have adopted ADU-friendly zoning allowing accessory dwelling units on residential lots. Others prohibit additional dwelling units in single-family zones. Where allowed, ADUs typically must meet size limits (600 to 800 sq ft), setback requirements, and may have owner-occupancy rules. A building permit is required. Parking requirements may apply.
Unpermitted ADU: standard building code enforcement. Zoning violation: cease-and-desist + fines. Must bring to code or remove.
Ann Arbor, MI
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Ann Arbor regulates overnight parking on public streets. Many areas restrict parking between certain hours or require permits for overnight street parking.
Ann Arbor, MI
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Ann Arbor, MI
Ann Arbor requires permits for retaining walls above a certain height, typically 4 feet. Engineering review may be required for taller walls.
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See how Ann Arbor's adu rules rules stack up against other locations.
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