ADU Rules: Concord vs El Cerrito
How do adu rules rules compare between Concord, CA and El Cerrito, CA?
Concord and El Cerrito have similar restriction levels.
Concord, CA
Contra Costa County
Concord must allow at least one ADU plus one Junior ADU per single-family residential lot under California Government Code §65852.2 (AB 68/881). ADUs up to 800 sq ft cannot be denied. Permits process within 60 days, 4-foot setbacks, no parking near transit, no impact fees under 750 sq ft.
View full Concord rules →El Cerrito, CA
Contra Costa County
Contra Costa County allows one ADU and one JADU on any residential lot by ministerial permit, consistent with AB 68/AB 881 and Gov. Code 65852.2. Detached ADUs up to 800 sq ft with 4-foot setbacks are permitted as of right, with 60-day review, no impact fees under 750 sq ft, and no replacement parking required near transit.
View full El Cerrito rules →Key Facts Comparison
| Fact | Concord | El Cerrito |
|---|---|---|
| - | - | |
| Units allowed | - | 1 ADU + 1 JADU per lot |
| Max detached ADU size | - | 800 sq ft ministerial; up to 1,200 sq ft |
| Setbacks | - | 4 ft side/rear (state minimum) |
| Processing time | - | 60 days ministerial |
| Short-term rental | - | Prohibited for ADUs (<30 days) |
Highlighted rows indicate differences between cities.
Concord FAQ
El Cerrito FAQ
Do I need to provide a parking space for my new ADU?
No, if your property is within half a mile of public transit, in a historic district, or the ADU is a conversion of an existing garage. Otherwise one space is required, which can be in a driveway tandem.
Can I rent my ADU on Airbnb?
No. State law allows counties to prohibit ADU rentals under 30 days, and Contra Costa prohibits short-term rentals of ADUs.
Compare other topics
See how Concord and El Cerrito compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool