Berkeley ADU and Zoning Guide for Homeowners

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team.

Berkeley requires a building permit for every accessory dwelling unit (ADU) and junior ADU (JADU), and the city runs an amnesty program to help owners legalize older unpermitted units. This guide summarizes what the City of Berkeley publishes, so you know where you stand before you build, sell or legalize.

Berkeley ADU rules at a glance

Permit needed	Yes, all ADUs and JADUs need a building permit
Standards	Berkeley Municipal Code Chapter 23.306
Where allowed	Lots with an existing or proposed single-family home, or an existing duplex or multi-family building
Review type	Ministerial under state law, with no public hearing
Courtesy notice fee	$500, collected with a new ADU building permit application
Address assignment	$250, non-refundable
Apply	City of Berkeley Permits Online portal

How the Berkeley ADU process works

Berkeley’s Land Use Planning Division checks zoning and development standards, and the building permit process checks the construction itself. The city publishes an ADU information sheet and FAQs, and a permit fee estimator for building fees. Planning questions can go to planning@cityofberkeley.info.

Unpermitted units and the amnesty program

Berkeley’s Amnesty Program for Unpermitted Dwelling Units lets owners legalize existing units. Staff help identify the path. Path 1 is to apply for a building permit and obtain a Certificate of Occupancy, with the unit reviewed against the ADU zoning and development standards. If you are selling, an unpermitted unit can complicate financing and appraisals, which is one reason owners choose a cash sale.

Where Berkeley ADUs are allowed and which law applies

Accessory dwelling units and junior ADUs are independent or semi-independent living spaces with complete or partial provisions for sleeping, cooking and sanitation. Berkeley allows them on lots with an existing or proposed single-family home, and ADUs are also permitted on lots with an existing duplex or multi-family building.

The city’s current ADU and JADU standards took effect on November 9, 2023 and follow California Government Code sections 66314 to 66332 and 66333 to 66339.

The local standards are in Berkeley Municipal Code Chapter 23.306, and the city also publishes an ADU information sheet with FAQs that covers fees, parking, measurements and rental and occupancy rules.

Berkeley also keeps a gallery of ADU designs it has already pre-approved. The city says these can offer a faster and less expensive path to permit approval than a custom design, which is worth knowing if you are weighing whether to build before a sale.

What happens after you submit an ADU permit application

1. Submit. Apply in person at the Permit Service Center or through the Permits Online portal.
2. Courtesy notice. Within 10 working days of submission, staff mail a notice to the owners and tenants of the property and of adjacent, confronting and abutting properties. A $500 fee collected with the application covers the notice.
3. Ministerial review. State law requires review of an ADU application without a public hearing, using objective criteria. Berkeley states that approved ADU permits are not appealable.
4. Deed restriction. Before the building permit is issued, you record a deed restriction with the Alameda County Clerk-Recorder. It prohibits using the ADU or JADU as a short-term rental and limits selling the accessory unit separately from the main home.
5. Address assignment. Every ADU except a JADU needs a new address, requested from the Building and Safety Division with a non-refundable $250 payment before the permit is issued. The city issues the address before final inspection.
6. Energy rules. Newly constructed ADUs are subject to Berkeley’s Electrification Reach Code in Chapter 19.36.

Berkeley’s Land Use Planning Division does not assess impact fees, and the city offers an online permit fee estimator for building permit costs.

Rules that affect additions, bedrooms and older buildings

If you are adding to a Berkeley home, the zoning rules go beyond the ADU standards. The city’s guidance says you should check your zoning and any special site conditions such as landmarks, creeks and seismic hazards on its parcel conditions page, then review the development standards for your district.

Large additions	No floor area limits in residential districts, but an addition over 600 square feet (or 15% of lot area, whichever is less) needs an Administrative Use Permit. Additions after October 31, 1991 count toward the threshold; attic and basement conversions with no expansion do not.
Bedrooms	In most residential districts, a fifth bedroom needs an Administrative Use Permit and a sixth or more needs a Use Permit. The rule can reach rooms that are not labeled as bedrooms.
Demolition	Removing 50% or more of a building’s exterior walls and roof counts as demolition and needs a Use Permit, with possible Landmarks Preservation Commission review.
Non-conforming setbacks	Alterations or additions within the setback need an Administrative Use Permit. The setback can be extended but not further reduced.
Lot coverage and density	A vertical addition on a lot over its coverage limit, or on a lot with more units than the zone allows, needs a Use Permit.

These thresholds matter when you sell. A buyer who sees a fifth bedroom or a large older addition may ask whether the correct use permit was obtained.

Legalizing an unpermitted unit before you sell

Berkeley’s Pilot Amnesty Program for Unpermitted Dwelling Units is open from January 1, 2025 to December 31, 2028. It is limited to single-family lots with an unpermitted ADU or JADU built before January 1, 2020.

Consultations with program staff are free and confidential, and the city says owners can discuss legalization without disciplinary action or code enforcement proceedings. Staff can be reached at UDUamnesty@berkeleyca.gov. Depending on demand, the city may place applicants on a waiting list.

Path 1: building permit and Certificate of Occupancy	Detailed plans, zoning review and inspections against the code. Fees are based on a percentage of the total estimated construction or conversion cost. Future violations cannot revoke the legalization.
Path 2: Housing Certificate of Compliance	Unit must meet the Housing Code and minimum fire and life safety standards. No zoning review. A permit is needed only for corrective work. Future violations could affect the compliance status.

Program fees listed by the city: no fee for pre-application consultations, a $590 application fee on either path, a $250 reinspection fee on Path 2, and the $250 address assignment fee.

Owners must hire licensed professionals, and Path 2 applicants submit inspection certification forms confirming the electrical, mechanical and plumbing systems work and the unit has no major structural deficiencies.

Owners can also request up to a five-year delay of code enforcement to meet a specified building standard, but never for fire, life and health safety violations.

The city lists reasons to legalize that matter to sellers: the unit becomes more appealing to buyers and renters, and home insurance may not cover unpermitted units.

Selling a Berkeley home with a unit: what California law requires

Whether or not you legalize, California’s disclosure rules apply. Under Civil Code section 1102.1, the transfer disclosure statement cannot be waived in an as-is sale, and your duty to disclose material facts stays in place.

If you know about work or a unit without a required permit, treat it as something to raise with your agent or escrow officer. A disclosure delivered after the buyer makes an offer lets the buyer cancel within three days of in-person delivery or five days of mailing.

Our California as-is and unpermitted work guide explains these rules, and our natural hazard disclosure guide covers the separate hazard zone disclosure.

Questions to answer before choosing how to sell

• Was the unit built or converted before January 1, 2020, and can you document it?
• Do you live in the main home or the JADU (needed for JADU amnesty eligibility)?
• Do you have time and budget for plans, licensed professionals and corrective work?
• Would a buyer’s lender or insurer accept the unit as it stands?

If the answers point to a long legalization process, a direct cash sale lets you sell the property as it is and leave the permit work to the buyer.

How to sell a house in Berkeley

1. Decide whether to legalize the unit first or sell as-is.
2. Gather any permits, plans and Certificates of Occupancy you have.
3. Request a no-obligation cash offer.
4. Review the offer and pick your closing date.
5. Close and receive your funds with no repairs required.

Frequently asked questions

Do I need a permit for a Berkeley ADU?

Yes. The City of Berkeley states that all ADUs and JADUs require a building permit.

Can I sell a Berkeley home with an unpermitted unit?

Yes, but lenders and appraisers may treat the unit differently. A cash buyer can purchase as-is. Talk to a real estate attorney or tax advisor about your situation.

Do ADUs in Berkeley get a public hearing?

No. The City of Berkeley notes that state law requires ministerial review of ADU applications without a public hearing and that approved ADU permits are not appealable. Neighbors do receive a courtesy notice by mail.

Can I rent my Berkeley ADU as a short-term rental?

No. The recorded deed restriction required for ADUs and JADUs prohibits short-term rental use and limits separate sale of the accessory unit from the main home.

How much does the Berkeley amnesty program cost?

Consultations are free. The city lists a $590 application fee, a $250 reinspection fee on the Housing Certificate of Compliance path, a $250 address assignment fee, and building permit fees based on the cost of the work.

Does my unit qualify for Berkeley’s amnesty program?

The pilot program covers single-family lots with an unpermitted ADU or JADU built before January 1, 2020. Contact UDUamnesty@berkeleyca.gov to confirm eligibility.

More guides

• We Buy Houses in Alameda County
• Alameda County Property Tax Guide
• Berkeley Building Permits Guide
• All California Guides

Sources

• City of Berkeley: Residential Additions and ADUs
• City of Berkeley: Amnesty Program for Unpermitted Dwelling Units

This guide is general information from public sources, not legal or tax advice. Confirm current rules with the City of Berkeley.