Garage conversion rules in San Joaquin County, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage-to-ADU conversions in unincorporated San Joaquin County are permitted by right under state law with no replacement parking required. SB 987 requires simultaneous review of demolition and ADU permits. Building permits are required for all habitable space conversions.
SJC Development Title 9 implements state ADU law for garage conversions. Converting a garage to an ADU is permitted by right with ministerial approval. Under AB 2221, replacement parking is not required for garage-to-ADU conversions. SB 987 (effective Jan 1, 2024) requires the county to review demolition permits and ADU permits simultaneously when a detached garage is being replaced with an ADU; adding an ADU does not trigger fire sprinkler installation in the existing primary dwelling. Non-ADU garage conversions to habitable space (home offices, recreation rooms) require building permits for structural or electrical modifications. Apply at permits.sjgov.org.
Unpermitted garage conversion: stop-work order, retroactive permit, and fines.
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See how San Joaquin County's garage conversions rules stack up against other locations.
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