San FranciscoSan Francisco, officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous city in California, with 808,437 residents, and the 17th most populous city in the United States as of 2022. The city covers a land area of 46.9 square miles (121 square kilometers) at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City and the fifth-most densely populated U.S. county.
San Francisco ADU Permits and Regulations Resources
Max ADU Size
850 square feet for a one-bedroom unit; 1,000 square feet for a two-bedroom unit
Primary Residence Setback
Side and Rear Setback
A minimum of 4 feet for both.