San Diego, CA Accessory Structures: Garage Conversions (2026)
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.
Key Facts
- Replacement Parking
- Not required
- Ceiling Height
- 7 feet minimum
- Permit Required
- Yes, through DSD
- Impact Fees
- Waived under 750 sq ft
- Code
- CA Gov Code 65852.2 + SDMC
Summary
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.
Conversions or Interior Alterations of Existing Structures: Where an existing structure is converted to an ADU, the ADU may continue to observe the setbacks of the existing structure. [...] The conversion of an existing accessory structure or a portion of the existing primary residence to an ADU is not subject to the 1,200-square-foot maximum gross floor area limitation. An ADU constructed within an existing accessory structure or a portion of the existing single dwelling unit may construct an additional 150 square feet to only allow for ingress and egress. [...] The conversion or demolition of a garage, carport, or covered parking structure does not require the replacement of parking spaces, except if the property is located in the Coastal Overlay Zone and within the Beach Impact Area of the Parking Impact Overlay Zone and outside of a transit priority area.
Full Breakdown
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.
Violations & Fines
Unpermitted conversions subject to code enforcement and double permit fees. Non-compliant conversions may be ordered restored to original condition or brought into compliance.
Frequently Asked Questions
Can I convert my garage to a living space in San Diego?
Does a garage conversion count toward my ADU limit?
Sources & Official References
Other rules in San Diego
California rules heatmap·Compare San Diego to another location·View the California accessory structures overview
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Garage Conversions in Nearby Cities
How other cities in San Diego County handle garage conversions.