San Mateo County
San Mateo County has an official local rule record in this scrape. Provider research is grouped at the San Mateo County level.
Direct answer
San Mateo Countyhas an official local ADU rule record in this directory. Start with the city's size, height, setback, parking, and owner occupancy standards below, then confirm lot-specific limits with the official source before hiring design or construction help.
Min: 150 square feet Max detached: not to exceed 800 square feet or 35% of primary residence, up to 1,500 square feet Max attached: not to exceed 800 square feet or 50% of primary residence, up to 1,500 square feet Max JADU: 500 square feet *Additional 150 square feet of floor area allowed for ingress/egress
26 feet; ADUs entirely within a primary residence may be the height of that residence. *Two-story ADUs allowed. Side and rear: 4 feet. Front: per underlying zoning district. Minimum separation: 5 feet, can be reduced with firewalls.
JADUs: No parking required ADUs: One spot may be required (tandem allowed). Outside of designated Midcoast areas, no parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle or ADU is within existing primary residence or accessory structure ADUs: none JADUs: owner occupancy required No short term rentals allowed
-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 Rules Budgeting Design Permitting Construction Renting Home » Local Rules » San Mateo County Local ADU Rules San Mateo...
Min: 150 square feet Max detached: not to exceed 800 square feet or 35% of primary residence, up to 1,500 square feet Max attached: not to exceed 800 square feet or 50% of primary residence, up to 1,500 square feet Max JADU: 500 square feet *Additional 150 square feet...
26 feet; ADUs entirely within a primary residence may be the height of that residence. *Two-story ADUs allowed.
Side and rear: 4 feet. Front: per underlying zoning district. Minimum separation: 5 feet, can be reduced with firewalls.
JADUs: No parking required ADUs: One spot may be required (tandem allowed). Outside of designated Midcoast areas, no parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle or ADU is within...
ADUs: none JADUs: owner occupancy required No short term rentals allowed
-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...