California ADU Law in 2026
Updated June 12, 2026 · Upside ADU
Quick answer
Recent California laws have expanded ADU rights: SB 1211 allows up to eight detached ADUs on qualifying multifamily lots, AB 1033 lets cities opt in to allow ADUs to be sold separately as condos, and statewide preemption (effective Jan 1, 2025) voided non-conforming local ADU ordinances. Sacramento follows these state minimums.
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?
Recent California ADU legislation
| Law | Effective | What it does |
|---|---|---|
| SB 1211 | Jan 1, 2025 | Up to 8 detached ADUs on multifamily lots; no parking-replacement mandate |
| AB 1033 | Opt-in | Allows ADUs to be sold separately as condos where adopted |
| Statewide preemption | Jan 1, 2025 | Voids local ADU rules that conflict with state law |
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, 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.
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 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:Talk to a builder
This guide is general information, not legal or tax advice. ADU rules change often and vary by city — we confirm the current requirements for your jurisdiction during your free feasibility check.
Sources & references
- SB 1211 (2024) — ADUs on multifamily lots — California Legislative Information
- AB 1033 (2023) — separate condo sale of ADUs — California Legislative Information
- Accessory Dwelling Units — official guidance — California Dept. of Housing & Community Development (HCD)
External links open official government and lender resources. Construction price and rent figures reflect 2026 Sacramento-region market conditions; confirm current rules and fees with your jurisdiction.