State and local coverage
San Francisco has curated State and Local paths so the page can show a source-backed starting point while reports compare applicable rule families.
California ADU rules · popularity rank #4
San Francisco ADU Rules & Requirements
San Francisco ADU rules include state and local paths across single-family and multifamily cases. The city page separates official source-backed rule rows from parcel-specific feasibility questions.
Based on 13 curated rule paths from official sources. Last reviewed June 2026.
Quick facts
- Popularity rank
- #4 California ADU market
- Rule paths
- 13 curated ADU rule sets
- Detached max size
- 850-1,000 sq ft by bedrooms
- Side / rear setbacks
- 4 ft state baseline
- Height
- 18 ft plus roof-pitch allowance
- Primary source
- SF Planning ADU page
Single-family and multifamily rules
The data covers single-family and multifamily ADU cases, including detached, attached, conversion, and JADU-style paths where official sources support them.
Bedroom-based size references
The state detached path includes 850 sq ft for studio or one-bedroom units and 1,000 sq ft for two-bedroom or larger units, with setback and height rows kept separate.
Check these rules against your lot
City rules explain the ceiling. Your parcel determines the practical answer: zoning, lot size, APN, setbacks, overlays, and buildable area.
Check my propertyTop California ADU city rules
San Francisco ADU FAQ
No. These pages summarize official city and state rule sources for planning research. Permit approval still depends on parcel geometry, zoning details, overlays, easements, fire access, utilities, and plan-check review.
California ADU law creates statewide minimum paths, while cities keep local standards for many project types. Showing both paths keeps the homeowner from treating a single city rule as the whole answer.
Run an address-specific feasibility check. The report combines official city rules with deterministic GIS and parcel data so the next question becomes what fits on your actual lot.
Source notes
Summaries reflect the official source listed below and the structured ADU rule data collected for HomeFeasible's first launch. Regulations change and individual parcels vary; verify current requirements with the city planning department or run a parcel-specific check before making decisions.
San Francisco Accessory Dwelling Units | SF PlanningCanonical URL: https://homefeasible.com/city/san-francisco/adu