Accessory Structures in Fairfield, CA (2026)
5 verified accessory structures rules for Fairfield, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Fairfield permits accessory dwelling units (ADUs) and junior ADUs (JADUs) on residential lots per FMC §25.20 and California Gov Code §65852.2/.22. Detached ADUs up to 1,200 sq ft and 16 feet tall; attached ADUs up to 50% of primary or 1,200 sq ft, whichever less. JADUs up to 500 sq ft. No additional density counted.
ADU Rules in Fairfield
Few RestrictionsADU Permits
Fairfield must approve or deny ADU permit applications ministerially within 60 days under Gov Code §65852.2. Applications go through the Fairfield BUILD portal with site plan, floor plan, elevations, and Title 24 documentation. Typical review is 4-8 weeks. No discretionary hearings allowed for code-compliant ADUs.
ADU Permit Process in Fairfield
Some RestrictionsADU Impact Fees
ADUs under 750 sq ft are exempt from all city development impact fees in Fairfield under California Gov Code §65852.2(f)(3). ADUs 750 sq ft and larger pay impact fees proportional to the primary dwelling, capped at the ratio of the ADU's square footage to the primary's square footage.
ADU Impact Fees in Fairfield
Few RestrictionsShed Rules
Fairfield exempts detached accessory structures under 120 sq ft and 12 feet tall from building permits but requires zoning compliance (setbacks, location, max coverage). Sheds under 60 sq ft and 7 feet tall may be placed anywhere except the front setback. Larger structures need a permit and may need engineered drawings.
Shed Rules in Fairfield
Few RestrictionsGarage Conversions
Garage-to-ADU conversions are permitted by right in Fairfield under FMC §25.20 and Gov Code §65852.2. Existing structures converted to ADUs require no additional setback or parking replacement. Full building, electrical, plumbing, and energy compliance (CalGreen, Title 24) still apply to the converted space.
Garage Conversion Rules in Fairfield
Few RestrictionsLooking for Solano County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Fairfield city rules.
Accessory Structures in Solano County →