ADU rules in Richmond, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Richmond permits ADUs and JADUs ministerially in all residential zones, with no owner-occupancy requirement for the ADU. Studios/1-bedroom units may be up to 850 sq ft and 2+ bedroom units up to 1,000 sq ft; detached ADUs are limited to 16 feet (18 feet near transit).
Richmond's ADU regulations are codified at Richmond Municipal Code Section 15.04.610.020 and implement California Government Code §§ 66310-66342 (renumbered from former § 65852.2 by SB 477, effective March 25, 2024). The City's official ADU Info Sheet (effective January 1, 2025) confirms ADUs are allowed in all residential areas zoned for single-family or multi-family housing, with no owner-occupancy required for the primary ADU. Maximum floor area is 850 sq ft for studios/1-bedroom and 1,000 sq ft for 2+ bedroom units. Detached ADUs are capped at 16 feet (or 18 feet within one-half mile walking distance of a major public transit stop or high-quality transit corridor under Public Resources Code § 21155), with an additional two feet permitted to accommodate a roof pitch matching the primary dwelling. Attached ADU additions may reach 25 feet or the zoning district height limit, whichever is lower. Side and rear setbacks for detached new-construction ADUs are 4 feet. ADUs may not be sold separately from the primary dwelling and may not be used as short-term rentals (rental terms must be 30 days or longer per Gov. Code § 66315 and § 66323). The approval is ministerial, with review within 60 days (30 days if using City pre-approved plans). No impact fees may be imposed on an ADU under 750 sq ft. On lots with single-family dwellings, up to one JADU, one attached ADU, and one detached ADU are allowed.
Construction without a building permit is a Code violation under RMC Chapter 15.04.950 and California Building Code 2025 Section 105. Unpermitted ADUs are subject to abatement, fines, and may not be rented or sold. The City may require removal or retroactive permitting at the owner's expense.
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Side-by-side rule comparisons with other cities in Contra Costa County.
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