ADU permit guide for San Francisco, California
San Francisco County, CaliforniaReviewed August 28, 2026
Department of Building Inspection reviews local ADU permits through the City Online Portal System. Use this page to plan the local process and the fee questions to verify before you submit.
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Permit fee planning by size
GetYourPermit research · 5 published reference lines
| ADU size | Researched range |
|---|---|
| 600 sq ft | $7,673 – $11,652 |
| 800 sq ftimpact-fee band | $9,741 – $15,104 |
| 1,000 sq ft | $11,041 – $17,351 |
| 1,200 sq ft | $12,423 – $19,541 |
Getting the permit
- Department
- Department of Building Inspection
- Where to apply
- City Online Portal System