Governor Newsom signed Senate Bill 9 into law in September 2021, which effectively eliminates single family zoning throughout the state of California.
SB 9 requires jurisdictions to ministerially approve a housing development of two dwelling units on a non-historic single-family zoned parcel, and to also ministerially approve a lot split for existing non-historic single-family zoned parcels of 2,400 square feet or greater, subject only to limited exceptions. This means that an existing parcel with one single-family house could be subdivided into two separate parcels, and each parcel could develop two dwelling units on each split lot, for a total of four units where there was only one dwelling unit originally.
