San Mateo County
Portola Valley has an official local rule record in this scrape. Provider research is grouped at the San Mateo County level.
Direct answer
Portola Valleyhas 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.
External ADU: 800 to 1,500 square feet depending on proposed setbacks/FAR JADU: 500 square feet Internal ADU: 1700 square feet *Not more than 50% of primary dwelling square footage, unless 50% of primary dwelling is less than 800 square feet.
less than base zoning district: 16 feet vertical/maximum height Compliant setbacks: 18 feet vertical height/24 feet maximum height *Higher builds require discretionary approval unless preempted by State Law Setbacks Less than base zoning district: Subject to additional standards (height/size) Attached: Same as zoning for primary dwelling Detached: rear and side – 4 feet, front – same as...
JADUs/Internal ADUs: None External ADUs: One parking spot required but may be shared with primary unit on parcels 1 acre or greater. Tandem parking/parking in setbacks allowed JADU: Required, ADU: not required for ADUs built recently (2020-2024)
-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 » Portola Valley Local ADU Rules Portola Valley...
External ADU: 800 to 1,500 square feet depending on proposed setbacks/FAR JADU: 500 square feet Internal ADU: 1700 square feet *Not more than 50% of primary dwelling square footage, unless 50% of primary dwelling is less than 800 square feet.
Not yet parsed from an official local source.
less than base zoning district: 16 feet vertical/maximum height Compliant setbacks: 18 feet vertical height/24 feet maximum height *Higher builds require discretionary approval unless preempted by State Law Setbacks Less than base zoning district: Subject to additional...
JADUs/Internal ADUs: None External ADUs: One parking spot required but may be shared with primary unit on parcels 1 acre or greater. Tandem parking/parking in setbacks allowed
JADU: Required, ADU: not required for ADUs built recently (2020-2024)
-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...