San Mateo County
Hillsborough ADU rules
Hillsborough 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
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...
Height
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...
Setbacks
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
Parking
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...
Owner occupancy
JADU: Required ADU: Not required for ADUs created on or after January 1, 2020
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...