ADU Laws California 2026

Last verified: October 6, 2026, against the enacted bill texts on California Legislative Information

California's ADU rules come from state law, carried out by each city's building department. Below are five recent bills, each summarized from the Legislative Counsel's digest of the enacted text and linked to it, followed by what they mean for permit timing. This is a plain-language orientation, not legal advice: for a specific property the answer depends on the current law, the parcel's zoning and how the local department applies them, and a decision with legal or financial weight deserves a licensed attorney. The state housing department's ADU Handbook is the official overview.

Five recent bills, from the enacted text

AB 976 (2023): no owner-occupancy requirement for ADUs

Chapter 751, Statutes of 2023 (bill text). A city or county can no longer require the owner to live on a property with an ADU, for any ADU. Local rules may still require that an ADU be rented for terms of 30 days or longer.

AB 1033 (2023): selling an ADU as a condominium, where the city allows it

Chapter 752, Statutes of 2023 (bill text). A local agency may adopt an ordinance that allows the main house and its ADU or ADUs to be sold separately as condominiums. It is optional for each city, so whether it applies to a given property has to be checked locally.

SB 1211 (2024): more detached ADUs on multifamily lots

Chapter 296, Statutes of 2024 (bill text). On a lot with an existing multifamily building, up to eight detached ADUs can be approved ministerially, as long as they do not outnumber the existing units; on a lot with a proposed multifamily building, up to two. It also ends replacement-parking requirements when an uncovered parking space is removed or converted for an ADU.

SB 543 (2025): a completeness check within 15 business days, and the size of a junior ADU

Chapter 520, Statutes of 2025 (bill text). A permitting agency has to decide whether an ADU or junior ADU application is complete, and say so in writing, within 15 business days of receiving it; if it is incomplete, the notice must list what is missing and how to complete it, and the agency must offer an appeal process. A junior ADU is defined as no more than 500 square feet of interior livable space.

AB 1154 (2025): owner occupancy for junior ADUs

Chapter 507, Statutes of 2025 (bill text). A city can require the owner to live in the house only when the junior ADU shares sanitation facilities with it; a junior ADU with its own bathroom does not trigger that requirement. Junior ADU rentals have to be for terms longer than 30 days.

A note on how to use this page

The summaries above follow each bill's official digest; the linked texts are the authority. For a specific property, the reliable next step is a check with LADBS (or the local building department) and, where the answer affects a legal or financial decision, a licensed attorney. Shulmen Construction LA can walk through how current rules apply to a specific address as part of an ADU consultation.

What this means for permit timing

Once an application for an ADU on a lot with an existing home is complete, state law gives the permitting agency 60 days to approve or deny it (Government Code section 66317); SB 543 adds the 15-business-day completeness check before that. If the ADU is applied for together with a new house, the agency may wait to decide the ADU until it decides the house. Those are legal deadlines, not averages. A Terner Center analysis of state data found that ADU applications in Los Angeles County took an average of 147 days to be permitted outside the Coastal Zone and 260 days inside it from 2018 to 2022. In the City of Los Angeles, LADBS's Approved Standard Plans Program shortens plan check for designs built from pre-approved plans.

Plan the phases separately: design and engineering first, then the city's review with any corrections and clearances, then construction. On our Beverlywood project, the detached ADU's LADBS permit took about three months and construction about eight, from demolition to final inspection. For cost ranges see the Los Angeles Remodeling Costs 2026 page, and for what a project includes, the ADU Construction page.

Why this changes so often

ADU policy has been one of the most actively legislated areas of California housing law for several years running, with the state removing local barriers to ADU construction and cities adjusting their own rules in response. That pace of change is why no single page, this one included, should be the final word on what is currently allowed. Shulmen Construction LA re-checks this page against the official texts and manages the permitting conversation with LADBS directly on every ADU project.