Accessory Structures in Milwaukee County, WI (2026)

1 county-level rule, plus city-specific rules for 4 cities in Milwaukee County, Wisconsin.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Milwaukee County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Milwaukee County has no countywide zoning - it is the only Wisconsin county that is 100% incorporated, with all 19 municipalities (10 cities and 9 villages) regulating ADUs locally. The City of Milwaukee, the largest jurisdiction, allows ADUs as a Limited Use in single-family residential districts (RS1-RS6) under a 2025 ordinance amending Code of Ordinances Chapter 295 (Zoning). Wis. Stat. §62.23 grants city zoning authority and §61.35 grants village zoning authority.

Accessory Dwelling Unit (ADU) Rules in Milwaukee County, Wisconsin

Some Restrictions

Full ordinance details →Official source ↗

Accessory Structures by City in Milwaukee County

4 cities in Milwaukee County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.

MilwaukeePop. 577,222

9 verified rules • ADU Impact Fees, ADU Owner Occupancy

Greenfield

2 verified rules • ADU Rules, Shed Rules

Wauwatosa

2 verified rules • ADU Rules, Shed Rules

West Allis

2 verified rules • ADU Rules, Shed Rules

All Milwaukee County ordinances

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