ADU rules in Concord, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
California Government Code §65852.2 (AB 68, AB 881, SB 13) and §65852.22 (JADUs) require all California cities including Concord to allow Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) on residential lots. Concord's ADU ordinance is codified in the Concord Development Code and conforms to state mandates. Property owners may build at least one ADU plus one JADU per single-family lot (two ADUs total), and multifamily properties may add multiple ADUs under separate provisions. Cities cannot restrict detached ADUs under 800 square feet below an 800 sq ft, 16-foot height allowance; must allow 4-foot rear and side setbacks; cannot require replacement parking for garage conversions near transit; cannot require owner-occupancy for new ADUs permitted between 2020-2024 (though AB 976 now allows permanent owner-occupancy requirements for JADUs only); must process permits within 60 days; and cannot charge impact fees for ADUs under 750 square feet. AB 1033 (2024) allows cities to opt in to ADU condo-ization (separate sale of ADUs). ADUs must connect to utilities; a separate water or sewer connection may be required by CCWD/Central Contra Costa Sanitary District. ADUs count as part of housing element production.
Contact your local code enforcement office for specific penalty information.
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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 Concord's adu rules rules stack up against other locations.
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