Vienna, VA Accessory Structures: Shed Rules (2026)

The Town of Vienna regulates residential greenhouses through the USBC small-structure exemption and the Vienna Zoning Ordinance accessory structure standards. A small, non-commercial, hobby greenhouse with a floor area not exceeding 256 square feet, not used for habitation, and without permanent plumbing or heating beyond portable heaters, is exempt from a building permit under the USBC. Portable polycarbonate hoop houses, plastic-sheet coldframes, and small lean-to greenhouses up to this size typically fall under the exemption. Larger greenhouses, any greenhouse on a permanent foundation with plumbing or permanent heating, or any commercial greenhouse require building permits through Fairfax County Land Development Services, with mechanical and plumbing permits as applicable. Zoning setbacks apply to all greenhouses regardless of permit exemption. Typical rear-yard setbacks of 5 to 10 feet and side-yard setbacks of similar magnitude apply, greenhouses must be in the rear or side yard, and they count toward overall lot coverage which is capped at 25 to 35 percent depending on district. Maximum height is typically 12 to 15 feet. Greenhouses for commercial sales (nursery operations) are not a permitted home occupation in residential districts and must be located in commercial or agricultural zones. Heating with propane, natural gas, or kerosene heaters must follow manufacturer clearances and fire safety rules; electric heaters plugged into a permitted outdoor outlet are simpler. HOAs may regulate greenhouse color, placement, and screening. Light pollution from grow lights visible through glazing can draw neighbor complaints. Stormwater runoff from polycarbonate roofs may need management during significant rain events.