California SB 423 — Streamlined Multifamily Approval (CA)
Tracked preemption from the California overlay bundle.
Overview
← All state preemptionsCalifornia overlay roll-upCalifornia zoning wikiCalifornia building codesFederal overlaysGlossaryFederal-conflict: Not flagged
Effective
2024-01-01
Sunset
2036-12-31
Authority
state
Scope
state:CA
Other California preemptions
California AB 2011 — Affordable Housing and High Road Jobs ActCalifornia AB 2097 — Parking Mandate Elimination Near TransitCalifornia SB 9 — Housing Opportunity and More Efficiency (HOME) ActCalifornia SB 10 — Local Upzoning AuthorizationCalifornia ADU / JADU By-RightCalifornia Builder's RemedyCalifornia Density Bonus Law
Primary-source summary
SB 423 — Streamlined Multifamily Approval (2023, effective 2024–2036)Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
AND
city.sb423_tier∈ {10%,50%}parcel.base_zone_category∈ {res_mf,mu,com}
Preempted fields
2 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
review_type | waive_discretionary | — | |
design_review | waive | — | 50%+ affordable projects waive design review entirely |
Citation
Authority source
CA Government Code §65913.4
Research notes
Tier sourced from CA HCD SB 35/423 Determination dataset. Exempt tier = jurisdiction meets RHNA milestones; no streamlining required. 10% tier = streamline ≥10% affordable projects. 50% tier = streamline ≥50% affordable projects. Prevailing wage / skilled & trained workforce requirements apply. Cannot be applied in coastal zone, very high fire severity zones, or on sites with existing tenants displaced within 10 years.