Bill > SF2369

This bill, effective July 1, 2026, aims to standardize and clarify regulations for accessory dwelling units (ADUs), which are secondary housing units on the same lot as a primary single-family residence, by amending existing county and city laws. Key provisions include requiring that ADUs be allowed in zoning districts where single-family residences are permitted as a principal use, and that their size be limited to either 1,000 square feet or 50% of the primary residence's size, excluding unfinished basements from the ADU size calculation. The bill also specifies that ADUs can only be prohibited or limited by deed restrictions or common interest community rules, not by local ordinances that are more restrictive than those applied to single-family residences, and clarifies that ADUs within historic preservation districts can only be regulated if they are deemed incongruous with the district's historical aspects. Furthermore, the bill defines "size" for the purpose of these regulations as the gross living area of the primary dwelling unit, excluding garages, decks, and unheated porches.