Garage Conversions: Brentwood vs El Cerrito
How do garage conversions rules compare between Brentwood, CA and El Cerrito, CA?
Brentwood and El Cerrito have similar restriction levels.
Brentwood, CA
Contra Costa County
Brentwood garages must meet California Residential Code requirements for fire separation, including 5/8-inch Type X drywall on walls and ceilings separating the garage from living space and a self-closing, self-latching 20-minute fire-rated door. Conversion to an ADU is permitted by right under AB 68, and the city cannot require replacement parking for transit-adjacent conversions.
View full Brentwood rules →El Cerrito, CA
Contra Costa County
Attached and detached garages in unincorporated Contra Costa must meet zoning setbacks and building code fire separation (1/2-inch gypsum from dwelling). Garages cannot be converted to living space without a permit, though garage-to-ADU conversions are streamlined under state law with no replacement parking near transit.
View full El Cerrito rules →Key Facts Comparison
| Fact | Brentwood | El Cerrito |
|---|---|---|
| - | - | |
| Fire separation | - | 1/2 in gypsum + 20-min self-closing door |
| Setback (detached) | - | 3 ft side/rear typical R-zones |
| Conversion to living | - | Requires permit + full CRC compliance |
| Garage-to-ADU parking | - | No replacement required near transit |
| Commercial use | - | Triggers home-occupation review |
Highlighted rows indicate differences between cities.
Brentwood FAQ
El Cerrito FAQ
Can I convert my garage to a bedroom without a permit?
No. Converting a garage to any habitable use requires a building permit, plan review, and final inspection. Unpermitted work creates liability at sale and can trigger enforcement.
Do I need replacement parking when I convert to an ADU?
No, if the site qualifies under AB 68—within a half mile of transit, in a historic district, or for a JADU or a converted ADU.
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