Vacaville, CA Accessory Structures: Shed Rules (2026)

VMC Title 15 adopts the California Building Code by reference. California Building Code 105.2 (Work Exempt From Permit) item 1 exempts one-story detached accessory structures used as tool and storage sheds, playhouses, and similar uses, provided the floor area does not exceed 120 square feet (about 10x12 feet). Wall height is generally capped at 10 feet and overall height at 18 feet per CBC 105.2 and VMC 14.09.200. The 120 sq ft exemption applies only to structures with no plumbing, no electrical, and no mechanical (HVAC) systems - adding any of those triggers separate trade permits even if no building permit is required for the structure itself. Larger sheds require a building permit through the Vacaville Building Division eTRAKiT portal and must meet California Residential Code or Building Code structural requirements. Zoning compliance under VMC 14.09.200 always applies: accessory structures must be located behind the front building line, set back at least 5 feet from side and rear property lines in most residential districts (RE, RL, RM), and 3 feet for accessory structures under 120 sq ft and 8 feet or less in height in some districts. Sheds in the Hillside (H) Overlay must use ignition-resistant construction per California Building Code Chapter 7A. HOAs (Browns Valley, Foxboro, Northpointe, Vanden Meadows) frequently impose stricter color, material, and roof-pitch rules under the California Davis-Stirling Act.