There is no countywide lot-coverage rule. Your city or township zoning ordinance caps how much of a lot buildings and impervious surfaces may cover, under the Michigan Zoning Enabling Act. Residential districts commonly allow roughly 30 to 50 percent.
Lot coverage, the share of a parcel taken up by buildings, drives, and other impervious surfaces, is capped district by district by each Saginaw County municipality, not the county. The City of Saginaw, Frankenmuth, and townships like Saginaw Charter Township and Thomas set maximum building coverage and sometimes total impervious coverage in their bulk schedules, often landing between 30 and 50 percent in residential zones. Coverage limits tie into stormwater management, and larger projects near the Saginaw, Tittabawassee, and Cass rivers face drainage review through the county drain commissioner and EGLE. Permeable pavers may earn partial credit in some ordinances. Exceeding a coverage cap requires a variance from the local zoning board of appeals.
The city or township zoning administrator enforces coverage limits; over-covering a lot draws a zoning violation and can hold up a certificate of occupancy. Relief comes only through a variance from the local zoning board of appeals.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Saginaw's lot coverage limits rules stack up against other locations.
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