Fairfax County, VA Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- R-1 conventional height cap
- 35 feet
- R-1 cluster height cap
- 60 feet
- Parapet/cornice allowance
- Up to 3 feet above limit
- Roof-feature exemption threshold
- 25% of roof area
- Sully Overlay max height
- 65 feet measured from grade
- First-offense fine
- $200 civil penalty
Summary
Fairfax County caps building height at 35 feet in the R-1 District under conventional subdivision standards, rising to 60 feet for structures in an approved cluster subdivision. Table 2102.4 of the Zoning Ordinance sets the number, while subsection 5100.2.C defines what counts toward it and which rooftop features are exempt.
Building height, maximum: 35 feet [Conventional] / 60 feet [Cluster]. ... (1) Maximum building height applies to all structures in the zoning district except those structures or features listed below and those structures assigned a different maximum height elsewhere in this Ordinance. (2) The height limitations of this Ordinance do not apply to accessory structures such as barns, silos, birdhouses, flues, or roof structures such as chimneys, spires, cupolas, gables, mechanical penthouses, domes, television antennas, water towers, water tanks, smoke-stacks, or other similar roof structures and mechanical equipment unless: (a) The structure(s) on a building roof cumulatively occupies an area greater than 25 percent of the total roof area; or (b) The structure is not used for a purpose accessory to the principal use of the building.
Official source re-checked September 7, 2026: no newer edition of the code had been published.
Full Breakdown
4, R-1 Lot and Building Standards, fixes the maximum building height for a conventional single-family subdivision in the R-1 District at 35 feet; a cluster subdivision approved under the same district can reach 60 feet. C(1), except structures the ordinance exempts or assigns a different height elsewhere. C(2) lists the exempt rooftop features by name: barns, silos, birdhouses, chimneys, spires, cupolas, gables, mechanical penthouses, domes, television antennas, water towers, water tanks and smokestacks are excluded from the height count unless they cumulatively cover more than 25 percent of the roof area or are not accessory to the building's principal use.
Rooftop HVAC units count toward height unless they sit in a penthouse or are fully screened on all four sides as an integral architectural element covering no more than 25 percent of the roof. A parapet wall, cornice, or similar projection may exceed the height limit by up to three feet, and USBC-mandated rooftop guardrails are excluded entirely. 4a requires the front setback to grow with the height, from 40 feet at 35 feet tall up to 67 feet at 60 feet tall. The Board of Supervisors can approve a special exception for extra height in specific commercial and institutional cases, and in the Sully Historic Overlay District and within 500 feet of it, an increase up to 60 feet of allowed height is possible, capped at an actual measured height of 65 feet from grade to the top of the roof or any rooftop structure.
Violations & Fines
Building or altering a structure above the applicable height limit without an approved special exception is a zoning infraction under Fairfax County Code § 8106.3.A: a $200 civil penalty for the first violation and $500 for each subsequent violation from the same facts. The Zoning Administrator can also require removal or reconstruction of the noncompliant portion of the structure.
Frequently Asked Questions
How tall can I build a house in Fairfax County's R-1 zoning district?
Do chimneys and antennas count toward my house's height limit?
Can Fairfax County approve a taller building than the zoning limit allows?
Sources & Official References
Other rules in Fairfax County
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