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Accessory Structures

Berkeley's Accessory Structures: The Rules That Matter

By CityRuleLookup Editorial Team

Every city handles accessory structures a little differently. In Berkeley, California, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

ADU Rules

Berkeley allows accessory dwelling units on any lot zoned for residential use, capping new-construction ADUs at 1,200 square feet outside the Hillside Overlay and 25 feet in height, with a 60-day Zoning Certificate review that cannot be denied for ADUs meeting state law.

Key details: Governing chapter: BMC Chapter 23.306. Max ADU size, outside Hillside Overlay: 1,200 sq. ft.. Max ADU height, outside Hillside Overlay: 25 ft.. Minimum lot line setbacks: 4 ft. rear/side/street side. Permit review timeline: 60 days, Zoning Certificate.

Building an ADU that exceeds the Table 23.306-2 floor area, height, or setback standards without an approved deviation, or occupying one before the Zoning Certificate is issued, is a zoning violation subject to the City's standard code enforcement process and can block final building permit sign-off.

ADU Rental Restrictions

Berkeley requires every ADU and Junior ADU to carry a recorded deed restriction barring rentals shorter than 30 days, filed with the Alameda County Recorder before the unit can be occupied, closing off short-term and vacation-rental use of these units.

Key details: Governing section: BMC 23.306.040(C)(3). Minimum rental term: 30 days. Restriction recorded with: Alameda County Recorder. Runs with the property: yes, binds future owners. Separate-sale restriction: Junior ADU never sellable apart from main home.

Renting an ADU or Junior ADU for a stay shorter than 30 days breaches the recorded deed restriction required under BMC 23.306.040.C and is enforceable by the City as a zoning violation against the property, independent of any separate short-term rental licensing rules that apply to other unit types.

ADU Owner Occupancy

Berkeley requires the owner to live in either the Junior ADU or the single-family home it sits in whenever a property has a Junior ADU, recorded as a deed restriction, unless the JADU has its own separate bathroom and kitchen or the owner is a public agency, land trust, or housing nonprofit.

Key details: Governing section: BMC 23.306.040(C)(4). Applies to: properties with a Junior ADU. Owner must occupy: the JADU or the single-family dwelling. Exception 1: JADU has separate sanitation facilities. Exception 2: owner is a public agency, land trust, or housing org.

Failing to maintain owner-occupancy of either the Junior ADU or the main single-family dwelling, where required, breaches the recorded deed restriction under BMC 23.306.040.C.4 and is enforceable by the City as a zoning violation running with the property.

Shed & Carport Rules

A new backyard shed in Berkeley needs an Administrative Use Permit in most residential districts, with height capped by lot-line distance and setbacks running as high as 50 percent of lot depth at the front.

Key details: Standard permit: AUP for new accessory building. ES-R threshold: UP required at 100 sq ft+. Max height (10 ft+ from line): 24 feet. Front setback, interior lot: 50% of lot depth. Alley setback: 5 feet.

Building a new accessory structure without the required AUP or Use Permit, or exceeding the height and setback standards in Table 23.304-7 without an approved deviation, is a zoning violation subject to the same enforcement and abatement authority the Zoning Officer applies to other unpermitted construction, including required removal or retroactive permitting.

The Bottom Line

Berkeley's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Berkeley is broadly strict or permissive.

All of the above reflects Berkeley's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.