Accessory Structures in Vienna, VA (2026)
3 verified accessory structures rules for Vienna, Virginia, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Vienna amended Town Code Chapter 18 in November 2024 to permit Accessory Living Units (ALUs) attached to single-unit detached homes in RS-16, RS-12.5, and RS-10 zoning districts, effective December 30, 2024.
Vienna ADU Rules (Accessory Living Units)
Some RestrictionsShed Rules
Greenhouses and garden structures in Vienna are treated as accessory structures. Small non-commercial greenhouses under 256 square feet are exempt from building permits under the Virginia USBC but must meet zoning setbacks, height, and lot coverage limits. Heated or permanently foundationed greenhouses larger than 256 square feet require full building permits.
Accessory Structures: Greenhouses
Some RestrictionsGarage Conversions
Detached garages in Vienna require a building permit regardless of size and must meet zoning setbacks, height, and lot coverage limits. Most single-family districts allow detached garages in rear or side yards with 5 to 10 foot setbacks and a maximum height of 15 to 18 feet. Converting a garage into habitable space requires additional permits and replacement off-street parking.
Accessory Structures: Garages
Some RestrictionsLooking for Fairfax County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Vienna city rules.
Accessory Structures in Fairfax County →