Garage conversion rules in Solano County, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
In unincorporated Solano County, converting a garage into living space requires a building permit through the Solano County Building and Safety Division. Conversions of an existing garage into habitable space are most commonly permitted as a Junior Accessory Dwelling Unit (JADU) or Accessory Dwelling Unit (ADU) under Solano County Code §28.72.10, as amended by Ordinance 2020-1817.
A garage conversion in Solano County is reviewed under both Chapter 28 (Zoning Regulations) and the California Residential Code as adopted by the County. Converting an attached garage into living space typically qualifies as a Junior ADU under §28.72.10(B)(3) when the new unit is 500 sq ft or less and the property owner lives on site in either the main home or the JADU. Converting a detached garage instead qualifies as a standalone ADU under §28.72.10(B)(2), with the existing footprint preserved and no change to existing setbacks required by state ADU law. All conversions must add code-compliant exits, light, ventilation, smoke and CO alarms, and bring electrical, plumbing, and mechanical work to current code. Solano County adopted Ordinance 2020-1817 to align its ADU and JADU standards with California Government Code §65852.2 and §65852.22.
Converting a garage into living space without a building permit is a violation of Chapter 28 (zoning) and the adopted California Residential Code. Code Compliance can issue stop-work orders and administrative citations and require the work to be either permitted retroactively or restored to a legal garage. Unpermitted dwelling conversions can also trigger California Health and Safety Code substandard-housing notices.
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See how Solano County's garage conversions rules stack up against other locations.
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