Shed permit rules in Milwaukee County, WI — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Milwaukee County has no shed ordinance. Detached sheds and garages are exempt from the Wisconsin Uniform Dwelling Code, so permits, size, and setbacks come from your city or village zoning and building code, subject to state fire-separation rules.
Sheds and detached accessory buildings are not regulated by Milwaukee County. Under the Wisconsin Uniform Dwelling Code, SPS 320.05(4) expressly exempts detached garages and accessory buildings from the code, with the single exception of the fire-separation requirement in SPS 321.08(1). So a detached shed's permit threshold, size, height, and setbacks are set by the city, village, or town where the property sits, through its zoning ordinance and building inspector. Many Milwaukee County municipalities require a zoning permit for any shed and a building permit above a size threshold (commonly around 150 square feet), plus setbacks and lot-coverage limits. Even a permit-exempt shed must still meet the state fire-separation standard near a lot line. Check with your municipality's inspection department.
Erecting a shed without the permit your municipality requires, exceeding local size or height limits, or violating setbacks can bring forfeitures and removal orders. A shed too close to a lot line may also violate SPS 321.08(1).
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