Accessory Structures in Fairfax, VA (2026)
3 verified accessory structures rules for Fairfax, Virginia, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
The City of Fairfax (independent city) currently allows Accessory Dwelling Units only as attached units within a single-family home under Zoning Ordinance §3.5.5.D.1. ADUs may not exceed 35% of the principal dwelling's size and may have no more than two bedrooms. Either the main or accessory unit must be owner-occupied. Detached ADUs are not currently permitted, and short-term rentals (Airbnb, etc.) are not allowed in the City.
Accessory Dwelling Unit Rules in the City of Fairfax
Heavy RestrictionsShed Rules
In the City of Fairfax, sheds under 256 square feet on residential lots typically do not require a building permit under the Virginia Uniform Statewide Building Code, but zoning approval is required. Sheds must meet rear and side setbacks, typically 5 to 10 feet, and cannot be placed in front yards. Electrical and plumbing work requires separate permits. HOA approval may be required.
Accessory Structures: Sheds
Some RestrictionsGarage Conversions
Detached garages in the City of Fairfax require a building permit regardless of size and must comply with residential zoning setbacks. Typical rear setbacks are 5 to 10 feet and side setbacks 5 feet for R-1 and R-2 districts. Maximum height usually 15 to 20 feet. Lot coverage and floor area limits apply. Converting a garage to living space requires separate permits and ADU review if adding kitchen.
Accessory Structures: Detached Garages
Some RestrictionsLooking for Fairfax County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Fairfax city rules.
Accessory Structures in Fairfax County →