ADU Rules: Antioch vs El Cerrito
How do adu rules rules compare between Antioch, CA and El Cerrito, CA?
El Cerrito has fewer restrictions than Antioch.
Antioch, CA
Contra Costa County
California state law (AB 68, SB 13, AB 881, and subsequent legislation) broadly permits ADUs in all single-family zones. Antioch must comply with state ADU law, allowing both attached and detached ADUs with streamlined permits.
View full Antioch 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 | Antioch | El Cerrito |
|---|---|---|
| Maximum Size | 1,200 sq ft (detached ADU) | - |
| Junior ADU | Up to 500 sq ft within home | - |
| Setbacks | 4 feet for detached ADUs | 4 ft side/rear (state minimum) |
| Approval | 60-day city review period | - |
| Units allowed | - | 1 ADU + 1 JADU per lot |
| Max detached ADU size | - | 800 sq ft ministerial; up to 1,200 sq ft |
| Processing time | - | 60 days ministerial |
| Short-term rental | - | Prohibited for ADUs (<30 days) |
Highlighted rows indicate differences between cities.
Antioch FAQ
Can I build an ADU in Antioch?
Yes, California law allows ADUs in all single-family zones. Detached ADUs up to 1,200 sq ft and junior ADUs up to 500 sq ft are permitted.
What are the setback requirements for ADUs in Antioch?
Detached ADUs have reduced setback requirements of 4 feet from side and rear property lines under state law.
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.
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