ADU Rules: Antioch vs Concord
How do adu rules rules compare between Antioch, CA and Concord, CA?
Concord 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 →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 →Key Facts Comparison
| Fact | Antioch | Concord |
|---|---|---|
| Maximum Size | 1,200 sq ft (detached ADU) | - |
| Junior ADU | Up to 500 sq ft within home | - |
| Setbacks | 4 feet for detached ADUs | - |
| Approval | 60-day city review period | - |
| - | - |
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.
Concord FAQ
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