Garage conversion rules in San Diego, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
San Diego permits garage conversions to ADUs under state law (Government Code 65852.2) without requiring replacement parking. Conversions must meet Building Code standards for habitable space including egress, ventilation, insulation, and fire separation. Permits required through Development Services.
Under California Government Code 65852.2 and SDMC ADU regulations, existing garages may be converted to accessory dwelling units. Key provisions: no replacement parking is required when converting a garage to an ADU (state law prohibits the City from requiring it). The converted space must meet Building Code standards for habitable space: minimum ceiling height (7 feet), natural light and ventilation (windows), adequate egress, fire separation from the primary dwelling, insulation, and smoke/CO detectors. A building permit is required from Development Services. The conversion typically qualifies as a 'converted ADU' separate from the detached or attached ADU allowance, meaning you can have a converted garage ADU plus an additional ADU on a single-family lot. Impact fees are waived for conversions under 750 sq ft. Electrical, plumbing, and mechanical work require separate permits. The garage conversion must include a kitchen and bathroom to qualify as an ADU.
Unpermitted conversions subject to code enforcement and double permit fees. Non-compliant conversions may be ordered restored to original condition or brought into compliance.
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Side-by-side rule comparisons with other cities in San Diego County.
See how other cities in San Diego County handle garage conversions.
See how San Diego's garage conversions rules stack up against other locations.
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