San Francisco ADU Rules & Regulations
Last updated: Verified:
ADU Rules and Regulations in San Francisco
San Francisco permits Accessory Dwelling Units (ADUs) on most residentially zoned properties under California state law and SF Planning Code Section 207(c)(4). The city processes ADU applications through ministerial review.
What You Can Build
- Detached ADU: A standalone structure up to 1,200 square feet with 4-foot rear and side setbacks, up to 16 feet tall.
- Attached ADU: An addition or conversion within or attached to the primary dwelling.
- Garage Conversion: Convert an existing garage to a dwelling unit -- one of the most common ADU types in San Francisco.
- Junior ADU (JADU): Up to 500 square feet converted from existing space within the primary dwelling.
Size Limits
| ADU Type | Maximum Size |
|---|---|
| Detached ADU | 1,200 sq ft |
| Attached ADU | 1,200 sq ft or 50% of primary dwelling |
| Junior ADU (JADU) | 500 sq ft |
Setbacks
- Side setback: 4 feet (detached ADU)
- Rear setback: 4 feet (detached ADU)
- Conversions: Existing legal structures maintain current setbacks even if nonconforming
Parking
No additional parking is required for ADUs. If a garage is converted, the lost parking spaces do not need to be replaced.
Permit Process
- Review your property on the SF Property Information Map (PIM)
- Schedule a pre-application meeting with SF Planning (recommended)
- Prepare architectural plans meeting building code requirements
- Submit application to SF Planning and the Department of Building Inspection (DBI)
- Ministerial review completed within 60 days of a complete application
- Receive permit, begin construction, and schedule inspections
Fees
Permit fees in San Francisco typically range from $5,000 to $20,000 depending on scope. ADUs under 750 square feet may be exempt from certain impact fees. The city also offers expedited review for qualifying ADU projects.
More about San Francisco Zoning
Sources
- SF Planning - ADU Overview·sfplanning.org·Accessed 2026-03-22·Direct link
- SF Planning Code Section 207(c)(4) - Accessory Dwelling Units·codelibrary.amlegal.com·Accessed 2026-03-22·Direct link(Section: Section 207(c)(4))
FAQ
Frequently Asked Questions
Can I convert my garage into an ADU in San Francisco?
Yes. Garage conversions are one of the most common ADU types in San Francisco. You can convert an existing garage into a dwelling unit without providing replacement parking spaces.
Do I need a Conditional Use permit for an ADU in San Francisco?
No. ADUs that meet state law requirements receive ministerial (non-discretionary) approval. No Conditional Use authorization, variance, or other discretionary review is required.
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.