ADU permit guide for Orinda, California
Contra Costa County, CaliforniaReviewed August 28, 2026
Use this page for early ADU permit planning in Orinda. A verified local process guide is not available yet, so confirm every step and fee with the city before you submit.
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Permit fee planning by size
GetYourPermit research · 3 published reference lines
| ADU size | Researched range |
|---|---|
| 600 sq ft | $6,750 – $16,800 |
| 800 sq ftimpact-fee band | $10,900 – $26,950 |
| 1,000 sq ft | $13,300 – $32,600 |
| 1,200 sq ft | $15,600 – $38,000 |
Getting the permit
We have not written Orinda’s permit guide yet. The official sources below are the right place to start.
View official permit starting points