ADU rules in Macomb County, MI β also called accessory dwelling unit regulations or granny flat ordinances β cover setbacks, owner-occupancy, parking, and permit requirements.
Macomb County does NOT regulate accessory dwelling units. Under the Michigan Zoning Enabling Act (PA 110 of 2006, MCL 125.3101 et seq.), zoning authority sits exclusively with home-rule cities, charter townships, and general-law townships. There is no statewide ADU mandate or preemption in Michigan. Each Macomb County jurisdiction β Sterling Heights, Warren, Roseville, Clinton Township, St. Clair Shores, Mount Clemens, Macomb Township, Shelby Charter Township, and others β sets its own rules through its local zoning ordinance.
Michigan's land-use framework gives general zoning authority to cities, villages, and townships under the Michigan Zoning Enabling Act, codified at MCL 125.3101 through 125.3702 (Public Act 110 of 2006). MCL 125.3201 authorizes local legislative bodies to enact zoning ordinances regulating land use and development. Counties may zone only in unincorporated, unzoned territory, and once a township adopts its own zoning ordinance the township ordinance controls (MCL 125.3209). Macomb County is fully covered by city and township zoning, so there is no county ADU rule. Michigan has no statewide ADU statute comparable to California's SB 9/SB 13 framework β the legislature has considered ADU bills (e.g., HB 4221 of 2021) but none have passed into general preemption. Consequently, ADU permissibility, size, owner-occupancy, parking, and short-term rental coupling vary by jurisdiction. Macomb Township's zoning ordinance is administered through the Planning Department at 54111 Broughton Road, Macomb, MI 48042; Sterling Heights, Warren, Roseville, Clinton Township, St. Clair Shores, and Mount Clemens each maintain separate zoning ordinances administered by their own building/planning departments. Building construction itself, regardless of zoning, must comply with the Stille-DeRossett-Hale Single State Construction Code Act (PA 230 of 1972, MCL 125.1501) and the Michigan Residential Code.
No county-level ADU enforcement. Violations are pursued by the local city or township under its zoning ordinance, typically as a municipal civil infraction with daily fines, plus stop-work orders and orders to remove unpermitted structures. Building Code violations under PA 230 of 1972 are enforced locally per MCL 125.1521. Unpermitted electrical or plumbing work under the Skilled Trades Regulation Act (PA 407 of 2016) is independently enforceable by LARA.
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