Genesee County sets no countywide retaining-wall rule. Height thresholds and permits are handled by your city or township building department; taller walls typically need engineered plans.
Retaining walls are regulated locally under the Michigan Zoning Enabling Act and the building code adopted by each city or township, not by Genesee County. A common threshold: walls over about 4 feet (measured bottom of footing to top) require a building permit and engineered drawings, and walls that support a surcharge or slope may need engineering at any height. Grand Blanc-area municipalities administer these through their building departments. Because the county has no standard, verify the exact height trigger, setback, and drainage requirements with your municipal building official before construction, and check the drain commissioner's rules if the wall affects stormwater flow.
A non-permitted or failing wall can draw a stop-work order, correction order, and civil fines from the local building department. The county enforces no retaining-wall standard.
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