ADU rules in Antioch, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
Under California law, ADUs up to 1,200 square feet are allowed on single-family lots. Junior ADUs up to 500 square feet within the existing home are also permitted. Cities cannot impose owner-occupancy requirements on ADUs through 2025. Setback requirements are reduced to 4 feet for detached ADUs. The city must approve or deny ADU applications within 60 days.
ADUs require building permits. Unpermitted ADUs face enforcement action.
Antioch, CA
Antioch prohibits modified exhaust systems, excessive engine revving, squealing tires, and loud car stereos audible more than 50 feet from the vehicle. Calif...
Antioch, CA
Antioch prohibits amplified music, loudspeakers, and sound equipment that can be heard more than 50 feet from the source or inside a neighbor's residence. Co...
Antioch, CA
Powered lawn and garden equipment in Antioch may be operated between 7:00 AM and 7:00 PM on weekdays and 8:00 AM to 5:00 PM on weekends and holidays. This in...
Antioch, CA
Antioch restricts construction noise to weekdays 7:00 AM to 7:00 PM and Saturdays 8:00 AM to 5:00 PM. Construction is prohibited on Sundays and major holiday...
Antioch, CA
Antioch enforces quiet hours from 10:00 PM to 7:00 AM on weekdays and 10:00 PM to 8:00 AM on weekends and holidays. During these hours, amplified sound, loud...
Antioch, CA
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Side-by-side rule comparisons with other cities in Contra Costa County.
See how other cities in Contra Costa County handle adu rules.
See how Antioch's adu rules rules stack up against other locations.
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