California ADU Law in 2026

Which recent laws changed California ADU rules?

California has spent several legislative sessions steadily expanding ADU rights and stripping cities of the ability to block them. According to California Legislative Information, the bills below are the ones that matter most for a 2026 build. This guide owns the statewide picture; for how these rules play out at the Sacramento permit counter, see the Sacramento rules guide.

• SB 1211 (eff. Jan 1, 2025): raised the detached-ADU cap on multifamily lots from 2 to up to 8, and bars requiring replacement of demolished uncovered parking
• AB 1033: lets localities opt in to allow ADUs to be sold separately as condominiums (subject to DRE approval)
• Statewide preemption (Jan 1, 2025): local ordinances that conflict with state ADU law became unenforceable

See also:Sacramento ADU rules, setbacks & permits — how these apply locally

What are the major 2025–2026 ADU bills at a glance?

What does SB 1211 mean for multifamily owners?

SB 1211 is the biggest change for investors. On a qualifying multifamily lot, the detached-ADU cap jumped from two to as many as eight — a fourfold increase — and cities can no longer force you to replace uncovered parking you demolish to make room. For a single-family homeowner the practical cap is still one ADU plus one JADU, but for anyone holding small apartment parcels, SB 1211 added real density on land they already own.

The economics compound with the rest of the framework. Each of those detached units is still reviewed on the ministerial 60-day clock, and any unit kept under 750 square feet is exempt from local impact fees (per California HCD), so the per-unit cost of adding density stays in check. Removing the parking-replacement mandate matters most on tight urban parcels, where surrendering covered or uncovered spaces used to be the thing that killed a project — under SB 1211, effective January 1, 2025, that obstacle is gone.

Can you sell an ADU separately under AB 1033?

AB 1033 is the law that lets an ADU be sold separately from the main house — as a condominium — but only in cities that opt in by adopting a local ordinance. Where it's available, it turns an ADU into a sellable asset rather than just a rental. Check whether your specific jurisdiction has adopted an AB 1033 program before counting on a separate sale.

What did AB 1332 change about pre-approved plans?

AB 1332 (added as Government Code section 65852.27) is the law that put pre-approved ADU plans on a statewide footing. It requires every California city and county to establish a program for the preapproval of ADU plans by January 1, 2025, and it bars an agency from limiting who can submit plans — homeowners, architects, engineers, designers, and ADU companies can all submit. Once a plan is preapproved, the agency must post it, along with the submitter's contact information, on its website.

The practical payoff is speed. When a complete application is for a detached ADU using a preapproved plan — or a plan identical to one the agency approved during the current triennial code cycle — the agency must approve or deny it within 30 days, half the standard 60-day ministerial ADU review baseline. The 30-day clock isn't a blanket promise: it's specific to complete detached-ADU applications using an eligible preapproved or identical plan, and it doesn't remove site-specific review for placement, utilities, foundation conditions, energy compliance, or fees.

See also:Pre-approved ADU plans in California — how AB 1332 and shelf-ready plans cut permit time

What building-code and Title 24 rules still apply?

Expanding ADU rights didn't waive the building code — a new ADU is still a dwelling and has to be built to it. Every permit package needs Title 24 energy-compliance documentation, structural calculations, and (where the lot requires it) a soils report, alongside the site plan, floor plans and elevations or a preapproved plan number, and a utility plan for water, sewer, and electrical service. Title 24 is California's energy-efficiency standard, and it's why ADU designs lean toward a tight building envelope and efficient mechanical systems such as heat-pump mini-splits.

Where state law does ease the burden is cost, not code. Units under 750 square feet are exempt from local impact fees (per California HCD), ADU utility connection and capacity fees are limited by statute, and the ministerial 60-day clock keeps review out of discretionary hearings. So the modern ADU framework is best read as two tracks: state law steadily widens what you're allowed to build and caps the fees, while the building and energy code still governs how the unit must be constructed.

What is statewide preemption, and how does it affect owner-occupancy?

The 2025 statewide preemption means a city can't enforce an ADU ordinance that's more restrictive than state law — setbacks, size minimums, and process hurdles that conflict with state standards are unenforceable. Combined with the suspension of owner-occupancy for ADUs permitted after January 1, 2020 (JADUs excepted) and the ban on parking-replacement mandates for conversions, the trend is unmistakably toward making ADUs easier to build.

What does the 2026 law mean for Sacramento homeowners?

For most single-family owners the practical takeaways are: you can build without owner-occupancy requirements (for ADUs permitted after Jan 1, 2020), you can't be forced to add parking for a conversion, and you have a clear 60-day permit clock. Investors with multifamily parcels gained the most room under SB 1211. Property taxes rise only by the ADU's added value — there's no special ADU tax exclusion in current law.

See also:Does an ADU increase property tax?

How do you confirm the current law for your lot?

ADU statutes change most legislative sessions, and cities implement them on their own timelines — especially opt-in programs like AB 1033. Treat this as orientation, not legal advice. We confirm the current rules with your specific jurisdiction as part of a free feasibility check, including whether local opt-in programs apply to your lot.

See also:Check My Lot