Hillsborough Accessory Dwelling Unit (ADU) Standards
New laws were recently passed, and updates will be coming soon
INFORMATION | |
Contact |
Planning Department – 650.375.7422 |
Website | |
ADU Ordinance | |
STANDARDS | |
Zones allowed |
All residential areas
|
Lot restrictions |
None |
Minimum lot size |
None |
Min / Max ADU size |
None / 1400 sf |
ADU building height |
32 feet, 22 foot wall height (same as primary residence) |
Setbacks |
Same as primary residence – minimum 25’ from front property line and 20’ from side property lines. Conversion of a legally nonconforming structure within the required setbacks is permitted however. |
Parking requirements |
For 1-2 bedroom units, one unenclosed space is required and for 3+ bedroom units, two unenclosed spaces are required, unless state exemptions are met (ADU is within 1⁄2 mile of transit, in existing structures, in historic districts, within one block of car share locations, or in an area with residential parking permit rules that do not allow second units to get a permit). Tandem parking and parking in setbacks is allowed.
|
Owner occupancy |
No requirement |
Sample fees from recently built projects* |
ADU 1 (674 sf, detached): $4,847
ADU 2 (437 sf, detached): $3,445
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Other requirements |
|
Process |
ADUs require administrative review without public notification, hearing, or fee. Design review is also required to ensure architectural consistency. Making an appointment to meet with a planner in the initial stages of the project can help avoid challenges and is highly recommended. |
Exceptions |
None |
Disclaimer: standards and process may vary. Consultation with the contact is recommended before starting any project.
*Fees are specific to each project and will vary. Fees change regularly. These are provided as examples only.
Download ADU Standards PDF
Updated: 12/11/2017