San Mateo County
San Bruno ADU rules
San Bruno has an official local rule record in this scrape. Provider research is grouped at the San Mateo County level.
Local rule facts
Min/max ADU 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%...
Height
single story: 18 feet, two-story/over garage complying with setbacks of underlying zone and aligning roof pitch to main house pursuant to SB-897 : 20 feet
Setbacks
Rear and side: 4 feet
Parking
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 but not offered to ADU...
Owner occupancy
JADU: Required, ADU: not required for ADUs built recently (2020-2024)
Process
-at-a-Glance FAQs Floorplans Inspiration Glossary Guidebook + Exercises Pre-Designed Plans Process-at-a-Glance See the resources page Events About Contact Getting Started Learning the Rules Budgeting Design Permitting Construction Renting Getting Started Learning the...