Accessory Structures in West Allis, WI (2026)
2 verified accessory structures rules for West Allis, Wisconsin, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
West Allis allows one accessory dwelling unit per lot as a limited accessory use in most residential and several commercial districts, defined as any dwelling unit besides the principal one.
West Allis Accessory Dwelling Unit Rules
Some RestrictionsWest Allis Revised Municipal Code § 19.36
Accessory Dwelling Unit A dwelling unit other than the principal dwelling unit. ... Accessory Dwelling Unit All Permitted up to 1 accessory dwelling unit per lot
Shed & Carport Rules
West Allis limits a detached shed ('Other Accessory Building') to 300 square feet and 15 feet of height, set back 60 feet from the front lot line and 3 feet from the side and rear lines.
West Allis Shed Size And Setback Rules
Some RestrictionsWest Allis Revised Municipal Code § 19.42
No residential accessory building may exceed the minimum and maximum standards set forth in the table below. If any cell is blank, no limit is imposed. Accessory Dwelling Unit Detached Garage Other Accessory Building Exterior Wall Height (maximum) 20' 10' 10' Height (maximum) Height of principal building, not to exceed 20' Height of principal building, not to exceed 18' 15' Buil...
Looking for Milwaukee County county-wide rules?
County ordinances apply to unincorporated areas and may supplement West Allis city rules.
Accessory Structures in Milwaukee County →