Berkeley updated its ADU standards to track 2023 state ADU law. Hillside Overlay and Rent Stabilization Ordinance interactions are the main local wrinkles. Conversion ADUs are treated distinctly from new construction.
Aligned with state ADU law. JADU up to 500 sq ft. Studio/1BR and 2+ BR ADU maxima per BMC Chapter 23.306. Conversion-only ADUs often treated differently on maximum size.
State guarantee: California requires every city to allow at least an 800 sq ft ADU exempt from local lot coverage, FAR, and front-setback rules.
Height baseline: 16 ft for detached, rising to 18 ft within ½ mile of major transit. Attached ADUs follow the primary home, capped at 25 ft.
Hillside Overlay can trigger parking unless a state exemption applies. Many non-Hillside parcels follow no-parking or reduced-parking outcomes.
Objective ministerial building-permit pathway when standards are met. City publishes ADU checklists and FAQs.
State backstop: A complete ADU permit must receive a decision in 60 business days. If the city stalls past 30 business days, AB 253 lets you hire a certified private plan checker to force a 10-business-day decision.
City has run pilot amnesty-style programs for qualifying unpermitted dwelling units with posted windows.
SB 543: No impact fees on ADUs ≤750 sq ft. Above 750 sq ft, fees scale to the ratio of ADU size vs the main home.
Visit the official Berkeley ADU page (link in hero) for current eligibility and downloads.
Standard ADUs in Berkeley: no owner-occupancy required (made permanent in 2023).
JADUs: limited to 500 sq ft of interior livable space within an existing single-family home. Owner occupancy is required only when sanitation facilities are shared with the main house. JADUs cannot be used as short-term rentals (AB 1154 / SB 543).
Sketch a floorplan, walk through it in 3D, and have our planners review it for size, height, and setback compliance before you submit to Berkeley.
Heads up: Local rules change frequently. This page summarizes publicly available state law (California Government Code §§ 66310–66342) and current local guidance for general planning purposes. Always confirm specifics with the Berkeley planning desk before submitting plans. ADUMetrics does not provide legal advice.