ADU permit process in Antioch, California
Contra Costa County, California
Prepared by GetYourPermit editorial teamReport an error
We haven’t written Antioch’s permit guide yet.
We publish permit process guides one city at a time, and we would rather publish nothing than guess at Antioch’s rules using another city’s process. Permit steps, submittal requirements, and review timelines are set locally, so a guide copied from a neighboring city would be wrong in ways that cost you time.
Here is what is useful for Antioch right now.
See the fee estimate for AntiochStart here instead — official and primary sources for Antioch
The official City page confirms that the live City page identifies and links the July 1, 2026 master fee schedule amended June 9, 2026 as its newest schedule.
Accessed August 28, 2026
The current City PDF publishes residential valuation inputs, the plan-check percentage, City surcharges, and the complete building-permit valuation table effective July 26, 2026.
Accessed August 28, 2026
The City-linked current code states the proportional ADU impact-fee formulas and exempts ADUs smaller than 750 square feet from City development impact fees.
Accessed August 28, 2026
What to ask the Antioch building department
- The current building permit fee schedule, and the date it took effect.
- Whether development impact fees apply at your square footage — many California cities waive them for ADUs of 750 sq ft or less.
- Plan submittal requirements: what drawings they expect, in what format, and whether submittal is online or in person.