Fairfax County, VA Fire Regulations: Brush Clearance (2026)

Unlike California or Colorado WUI zones, Fairfax County does not have mandated defensible-space clearance distances. However, several regulatory mechanisms address vegetation fire risk. Fairfax County Code Chapter 119 (Property Maintenance) limits grass and weeds on improved lots to 12 inches; violations can be abated by the County at the owner's expense. The Statewide Fire Prevention Code Section 304 prohibits accumulation of combustible materials that create a fire hazard. The Fire Marshal can order abatement of dangerous conditions under SFPC 110. Virginia's 4 PM Burning Law (§10.1-1142) and VDOF-issued burn bans address fire season risk by limiting ignitions rather than requiring clearance. The Virginia Department of Forestry promotes the national Firewise USA program, and communities in fire-prone western Fairfax County (Great Falls, Clifton, parts of Burke near wooded parks) participate voluntarily. Recommended Firewise practices include keeping a 30-foot defensible zone around structures, pruning tree limbs 10 feet from chimneys, clearing debris from gutters and roofs, and maintaining screened vents. Homeowners in wooded subdivisions should also coordinate with HOAs that often have tree preservation covenants which can limit clearance (some require a pre-removal permit if clearing more than a threshold diameter). The County Urban Forestry Division reviews tree removal on lots subject to tree preservation easements.