5 county-level rules, plus city-specific rules for 4 cities in Milwaukee County, Wisconsin.
Verified from official government sources
Milwaukee County does not have a countywide ADU ordinance. In Wisconsin, accessory dwelling units are a zoning matter regulated by each city, village, or town under its own zoning code and building permits, not by county government.
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.
Wis. Admin. Code SPS 320.05(4)
With the exception of s. SPS 321.08 (1), the provisions of this code do not apply to detached garages or to any accessory buildings detached from the dwelling.
Milwaukee County does not regulate garage conversions. Converting a garage into living space is a zoning and building-code matter handled by your city or village, and adding a dwelling unit brings the space under the Wisconsin Uniform Dwelling Code.
Milwaukee County has no carport ordinance. As a detached accessory structure, a carport is exempt from the state Uniform Dwelling Code, so its permit, size, height, and setbacks are set entirely by your city or village zoning code.
Milwaukee County has no tiny-home ordinance. A tiny house on a foundation is a dwelling under the Wisconsin Uniform Dwelling Code and is zoned by your city or village; a tiny house on wheels is treated as an RV and cannot be a permanent residence without local approval.
4 cities in Milwaukee County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Milwaukee County — parking, noise, fences, fires, animals, pools, and more.
Milwaukee County Ordinance Hub →