CA SB450

Removes the 25% exterior structural wall demolition limit for two-unit housing developments in single-family zones to qualify for ministerial (automatic) approval without discretionary review.

Prohibits local agencies from imposing zoning, subdivision, or design standards that apply non-uniformly across underlying zones, but allows standards that are more permissive than existing zone requirements.

Eliminates local agencies' authority to deny housing developments based on adverse impacts to the physical environment; only allows denial for specific adverse impacts to public health and safety with no feasible mitigation.

Requires local agencies to approve or deny housing development and urban lot split applications within 60 days of receiving a completed application, with automatic approval if deadline is missed.

Mandates that if applications are denied, permitting agencies must provide written feedback listing deficient items and describing how the applicant can remedy the application.