Accessory Structures in Vacaville, CA (2026)
5 verified accessory structures rules for Vacaville, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Vacaville permits ADUs and JADUs ministerially under VMC 14.09.122 in conformance with California Government Code 66310 et seq. (renumbered from 65852.2 effective 2024). ADU maximum size scales with the primary dwelling: 850 sq ft if primary is up to 1,700 sq ft, 1,000 sq ft if primary is up to 2,000 sq ft, and 1,200 sq ft (or 50% of primary if larger) otherwise. ADUs cannot be used for short-term rentals under 31 days.
Vacaville ADU Rules (VMC 14.09.122 + Gov. Code 66310)
Some RestrictionsADU Permits
Vacaville processes ADU and JADU permits ministerially through the Community Development Department / Building Division under VMC 14.09.122 and California Government Code 66317. The city must act on a complete application within 60 days. Submittal is through the eTRAKiT online portal. Pre-approved ADU plans accelerate review under AB 434 (Gov. Code 66315).
Vacaville ADU Permit Process (Ministerial 60-Day Review)
Some RestrictionsADU Impact Fees
Under California Government Code 66322(a) (formerly 65852.2(f)(3)) and VMC 14.09.122, Vacaville ADUs under 750 square feet are exempt from all city impact fees. ADUs 750 sq ft and larger pay impact fees proportional to the ratio of ADU floor area to primary dwelling area. Standard building, plan-check, and utility connection fees still apply at any size.
Vacaville ADU Impact Fees (Sub-750 Sq Ft Exempt)
Few RestrictionsShed Rules
Vacaville sheds 120 square feet or smaller are exempt from a building permit under California Building Code 105.2(1) as adopted in VMC Title 15. Larger sheds require a building permit. All accessory structures must comply with VMC 14.09.200 zoning setbacks - typically 5 feet from side and rear lines and behind the front building line, with no electrical or plumbing for the permit exemption.
Vacaville Shed Rules (Building Code 120 sq ft Exemption)
Few RestrictionsGarage Conversions
Vacaville permits conversion of an existing attached or detached garage into an ADU under VMC 14.09.122 and California Government Code 66320(a)(1). No replacement parking is required (Gov. Code 66321(a)(2)). State default 4-foot side and rear setbacks apply for new construction within the existing garage footprint. Building permits and Title 24 energy compliance are required.
Vacaville Garage Conversion to ADU (Gov. Code 66320)
Few RestrictionsLooking for Solano County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Vacaville city rules.
Accessory Structures in Solano County →