Fairfax County, VA · Fairfax County Zoning Ordinance
I-3 provides for scientific research, development and training, offices, light-intensity production of goods, and related supporting nonresidential activities -- a broad spectrum of clean industries under enhanced performance standards. Height 75ft. FAR 0.40 (up to 0.50 by Board). Front setback equal to building height (at least 40ft); side equal to height (none abutting a railroad). Landscaped open space min 15%. Min lot 40,000 sq ft. Section 2104.3.
Development standards in I-3
Maximum FAR
0.4
Maximum height
75 ft
Minimum lot size
40000 sq ft
Read from Fairfax County Zoning Ordinance, effective through 2026-07-01.
Permitted uses in I-3
AllowedLight Manufacturing
AllowedWarehouse / Distribution
AllowedOffice / R&D
Not AllowedSTR - Short-Term Rentals STRs not permitted in this zone.
Not AllowedResidential
"Conditional" means the use generally requires a public hearing or special-exception approval — a very different timeline and risk profile from a by-right permit.
This is the zone. What about the parcel?
Zone rules are the starting point — the answer for a specific property also depends on lot
size, overlays, existing improvements and site conditions. Run a free address lookup to see
what applies to one property.