San Mateo County
Hillsborough has an official local rule record in this scrape. Provider research is grouped at the San Mateo County level.
Direct answer
Hillsboroughhas 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.
JADU: 500 sq. ft. Building Permit Only: 800 sq. ft. Detached/Attached ADU Planning Permit (one bedroom or less): 850 sq. ft. Detached/Attached ADU Planning Permit (2+ bedrooms): 1,000 sq. ft. Applicant can request an ADU Exception Review, which allows more permissive standards through a discretionary review process.
Detached: Up to 16 feet. If site is within ½ mile walking of transit, then 18 feet is allowed (Up to 20 feet if necessary to accommodate a roof pitch). Detached with increased setbacks: Up to 22 feet, if ADU has side and rear setbacks of at least 20 feet and is at least 25 feet from all public right-of-way. Attached: Up to height of primary dwelling or 25 feet, whichever is lower. Side...
JADUs: No parking required ADUs: One spot may be required (tandem or within setback allowed). No parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle, or on-street parking permits are required but not offered to ADU occupant when the ADU application is submitted with an application to create a new primary...
-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 » Hillsborough Local ADU Rules Hillsborough...
JADU: 500 sq. ft. Building Permit Only: 800 sq. ft. Detached/Attached ADU Planning Permit (one bedroom or less): 850 sq. ft. Detached/Attached ADU Planning Permit (2+ bedrooms): 1,000 sq. ft. Applicant can request an ADU Exception Review, which allows more permissive...
Detached: Up to 16 feet. If site is within ½ mile walking of transit, then 18 feet is allowed (Up to 20 feet if necessary to accommodate a roof pitch). Detached with increased setbacks: Up to 22 feet, if ADU has side and rear setbacks of at least 20 feet and is at...
Side and Rear: 4 feet Front: 25 feet, unless these would preclude the construction of an ADU that is 800 square feet No setback is required for an ADU that is constructed in the same location and to the same dimensions as an existing structure
JADUs: No parking required ADUs: One spot may be required (tandem or within setback allowed). No parking required if: ½ mile walking distance from public transit, in a historic district, or one block from a car-share vehicle, or on-street parking permits are required...
JADU: Required ADU: Not required for ADUs created on or after January 1, 2020
-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...