Evaluating the Potential for Building 5- to 10-Unit Housing Projects Across California

Student Work
Emily Biro
June 2023

California passed Senate Bill 9 in 2021, allowing for the development of up to four units on single-family zoned parcels. However, housing professionals and recent studies indicate that the requirements and restrictions of SB 9 do not allow for financially feasible development. Accordingly, the overall impact of SB 9 remains unclear. Given feasibility concerns with proposed SB 9 projects, this research explores whether larger developments, with five to 10 units, are more financially feasible on parcels currently zoned for single-family homes in California.