Accessory Structures in Loudoun County, VA (2026)
2 rules for unincorporated Loudoun County, Virginia.
Verified from official government sources
ADU Rules
Loudoun County caps accessory dwellings at 1,200 to 2,500 square feet depending on zoning district under Section 4.02.01, limits most lots to a single unit, and only allows a second on parcels of 20 acres or more.
Loudoun County Accessory Dwelling Size Limits
Some RestrictionsLoudoun County, VA, Zoning Ordinance § 4.02.01.B, D, G (Accessory Dwellings)
B. Maximum Size. Accessory Dwellings must not exceed the following maximum size: 1. In Transition Zoning Districts..., Rural Zoning Districts..., and Joint Land Management Area Zoning Districts..., the lesser of: a. 70% of the gross floor area of the principal structure and a footprint not more than 70% of the footprint of the principal structure; or b. 2,500 square feet in gross floor area. 2....
Shed & Carport Rules
A carport in unincorporated Loudoun County counts as a non-habitable accessory structure under the Zoning Ordinance's definition: a roofed space outside a building used to shelter vehicles. Attached to a single-family home, it must sit more than 5 feet from a rear or side property line and meet road setbacks of 60 feet (regular lots) or 40 feet (irregular lots), plus a Zoning Permit before construction.
Loudoun County Carport Setback Rules
Some RestrictionsLoudoun County, VA, Zoning Ordinance § 7.01.04.B.2.g; § 10.04.A.2; Ch. 12 (Definitions)
Carport: Any space outside a building and contiguous thereto, wholly or partly covered by a roof, and used for the shelter of motor vehicles. A carport may have a side enclosure that is more than eighteen inches in height, exclusive of required supports and the side of the building to which the carport is contiguous. ... In conjunction with single-family dwellings only, any non-habitable, acces...
All Loudoun County ordinances
See every category we cover for Loudoun County: parking, noise, fences, fires, animals, pools, and more.
Loudoun County Ordinance Hub →