Garage conversion rules in Dane County, WI — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions to living space in unincorporated Dane County require building permits and must meet habitable space standards under Wisconsin building code. Converting to an ADU is permitted in appropriate zoning districts.
Converting a garage to a living unit or ADU in unincorporated Dane County requires a building permit and zoning review. The converted space must meet Wisconsin SPS habitable space standards (minimum ceiling height, egress windows, insulation, heating). If the conversion eliminates required on-site parking, replacement parking may need to be provided. Conversions to an ADU are permitted in residential and some agricultural zoning districts under Chapter 10.
Unpermitted garage conversions are building code violations subject to stop-work orders and fines. Non-compliant conversions may require restoration.
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See how Dane County's garage conversions rules stack up against other locations.
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