ADU permit process in Fairfield, California
Solano County, California
Prepared by GetYourPermit editorial teamReport an error
We haven’t written Fairfield’s permit guide yet.
We publish permit process guides one city at a time, and we would rather publish nothing than guess at Fairfield’s rules using another city’s process. Permit steps, submittal requirements, and review timelines are set locally, so a guide copied from a neighboring city would be wrong in ways that cost you time.
Here is what is useful for Fairfield right now.
See the fee estimate for FairfieldStart here instead — official and primary sources for Fairfield
- CityPermit Fees
The live City Permit Fees page identifies the linked FY2026-27 ADU fee schedule as effective July 1, 2026 and explains that plan-check fees are due at plan submission while the remainder is due at permit issuance.
Accessed August 29, 2026
The City-hosted FY2026-27 ADU fee schedule gives the dedicated Building, review, utility, development-fee, and 750-square-foot proportionality rules; the document is marked revised November 24, 2025.
Accessed August 29, 2026
What to ask the Fairfield building department
- The current building permit fee schedule, and the date it took effect.
- Whether development impact fees apply at your square footage — many California cities waive them for ADUs of 750 sq ft or less.
- Plan submittal requirements: what drawings they expect, in what format, and whether submittal is online or in person.