California ADU Laws 2025: Everything Homeowners Need to Know
Jaime Costilla ·
California ADU Laws: 2025 Update
California continues to lead the nation in ADU-friendly legislation. Here's everything you need to know about the current laws and how they affect your ADU project.
Key Laws Currently in Effect
AB 976 — No Owner-Occupancy Requirement (Permanent) Previously, some cities required property owners to live on-site if they had an ADU. AB 976 permanently eliminates this requirement for standard ADUs, meaning you can rent out both your main home and your ADU.
Exception: JADUs still require owner-occupancy of either the main home or the JADU.
AB 1033 — ADU Separate Sale This groundbreaking law allows ADUs to be sold separately from the main home as condominiums. This means:
- Your ADU can be its own sellable property
- Buyers can purchase just the ADU (potentially at a lower price point)
- This creates new affordable homeownership opportunities
Note: Cities must opt in to AB 1033, so check your local jurisdiction.
AB 434 — Pre-Approved ADU Plans Requires all California cities to develop pre-approved ADU plans by January 1, 2025. Benefits:
- Faster permitting (often 2-3 weeks instead of 6-8)
- Lower design costs
- Reduced plan check fees in some cities
- Certainty of approval
SB 13 / AB 68 / AB 881 — Core ADU Framework These foundational laws established:
- 60-day permit review timeline
- Ministerial (non-discretionary) approval
- Reduced setbacks (4 feet rear and side)
- Elimination of parking requirements for conversions
- Fee waivers for units under 750 sq ft
- Allowance for both an ADU and JADU on single-family lots
AB 670 — HOA Restrictions Homeowners associations cannot prohibit ADUs on single-family lots. While HOAs can impose reasonable design standards, they cannot effectively prevent ADU construction.
Size & Setback Rules
| ADU Type | Maximum Size | Setback Requirements |
|---|---|---|
| Detached | 1,200 sq ft | 4 ft rear and sides |
| Attached | 50% of existing home | 4 ft rear and sides |
| Garage Conversion | Existing structure | None (existing location) |
| JADU | 500 sq ft | None (within existing home) |
What's Coming Next
The California legislature continues to consider new ADU-related bills. Trends to watch:
- Further streamlining of permitting processes
- Additional incentives for affordable ADU rentals
- Expansion of ADU separate sale provisions
- Potential state-level ADU financing programs
Vision ADU stays current with every California ADU law change. Contact us for expert guidance on your project.