2 rules for unincorporated Loudoun County, Virginia.
Verified from official government sources
Loudoun County enforces outdoor lighting standards through Revised 1993 Zoning Ordinance §5-652 (Outdoor Lighting Performance Standards). New installations must use full-cutoff fixtures directing light downward. Maximum illuminance at property lines specified. Data center campuses in Ashburn have specific lighting standards to limit spillover. Middleburg area and rural western Loudoun have stronger dark-sky interests due to horse country and agritourism. Sky Meadows State Park nearby is a designated IDA Dark Sky area. Incorporated towns have their own standards.
Loudoun County Zoning Ordinance §5-652 caps illuminance at 0.1 foot-candle at residential property lines from non-residential sources. Light trespass complaints handled by Loudoun Code Enforcement. Virginia common-law nuisance supports civil action against excessive neighbor lighting. Rural western Loudoun sees frequent complaints about unshielded barn lights and security lights. Commercial violations escalate quickly; residential disputes often handled via mediation or HOA covenants.
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