ADU permit guide for Lafayette, California
Contra Costa County, CaliforniaReviewed August 28, 2026
Use this page for early ADU permit planning in Lafayette. 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 | $7,700 – $17,550 |
| 800 sq ftimpact-fee band | $12,000 – $26,800 |
| 1,000 sq ft | $14,100 – $31,300 |
| 1,200 sq ft | $16,400 – $36,200 |
Getting the permit
We have not written Lafayette’s permit guide yet. The official sources below are the right place to start.
View official permit starting points