San Bruno ADU topic page
San Bruno ADU Rules
Start with the official local ADU rules, then confirm lot-specific limits before requesting provider quotes.
Short answer
Start with the official local ADU rules, then confirm lot-specific limits before requesting provider quotes.
Source requirement: Official city or county rule source parsed and cited.
Local rule evidence
Size
Min: 150 sf – size required by Health Code, section 17958.1 Max one bedroom or less: 850 square feet Max one bedroom or more (Lots less than 7,500 SF): 1,000 SF Max two+ bedrooms ( Lots greater than 7500 square feet): . 1,200 square feet Max JADU: 500 square feet *50%...
Setbacks and parking
Rear and side: 4 feet JADUs: No parking required ADUs: One spot may be required (tandem allowed). No parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle on-street parking permits are required...