New state ADU and housing laws take effect January 2027
Summary
Vice Chair Combs urged staff to prepare for a wave of new state laws — SB 1117 fixing the 750-square-foot DIF fee cliff, AB 956 allowing two detached ADUs on single-family lots, AB 2601 combining SB 9 lot splits with housing projects, and AB 1621 capping plan-check revisions — all effective January 1, 2027.
At a glance
- Total mentions
- 1
- Last 30 days
- 1
Discussed at 1 meeting in the last 60 days; most recently Oct 28, 2026.
Impact analysis
SB 1117 will change development impact fees for ADUs over 750 square feet, potentially cutting costs for homeowners adding larger ADUs.
Homeowners and builders planning ADUs and SB 9 projects under the new, more permissive rules.
Mentions & discussions (1)
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