Garage conversion rules in Milwaukee County, WI — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
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.
Garage conversions are not addressed by any Milwaukee County ordinance. Whether you may convert a garage into habitable space, and what setbacks, parking replacement, and occupancy rules apply, is set by the zoning code of the city, village, or town under Wis. Stat. 62.23(7). While a detached garage alone is exempt from the state Uniform Dwelling Code under SPS 320.05(4), converting it into living quarters generally creates a dwelling unit that must meet the UDC (chs. SPS 320 to 325), administered by the municipal building inspector under SPS 320.06. A unit that becomes an accessory dwelling also follows that municipality's ADU standards, and lost off-street parking is a common local issue. The county does not issue these approvals.
Converting a garage without the zoning approval and building permit your municipality requires can trigger stop-work orders, forfeitures, and orders to restore the garage. A conversion that fails the Uniform Dwelling Code may be denied occupancy.
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