Fairfax County, VA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- R-1 front setback
- 40 feet, conventional subdivision
- R-1 side setback
- 20 feet each side, 40 feet total
- R-1 rear setback
- 25 feet, conventional subdivision
- Cluster side/rear setback
- Equal to building height, min 20/25 feet
- Setback-exempt structures
- Mailboxes, bus shelters, street lights, utilities
- First-offense fine
- $200 civil penalty
Summary
Fairfax County's R-1 District requires a 40-foot front setback, a 20-foot minimum side setback (40 feet total on both sides) and a 25-foot rear setback for conventional single-family lots. Table 2102.4 of the Zoning Ordinance sets those numbers, while subsection 5100.2.D spells out which structures the setback rules do and do not reach.
Front setback, minimum: 40 feet [Conventional] / 30 feet [Cluster]. ... Side setback, minimum: 20 feet [total minimum 40 feet]. ... Rear setback, minimum: 25 feet. ... (a) Minimum setbacks are specified for each zoning district, except as may be further qualified by other provisions of this Ordinance. (b) Minimum setbacks apply to all buildings and structures as they relate to the lot lines and public streets except as provided in subsection 5100.2.F(2) and for the following: 1. Underground utility equipment; 2. Mailboxes; 3. Bus shelters; 4. Street lights; 5. Public bicycle shelters; and 6. Any similar structures or devices that are in the public interest and are in harmony with and do not adversely impact the surrounding area as determined by opinion of the Zoning Administrator.
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, sets the yard setbacks for a conventional single-family subdivision in the R-1 District at 40 feet minimum from the front lot line, 20 feet minimum on each side (a combined 40 feet across both side yards), and 25 feet minimum from the rear lot line. A cluster subdivision in the same district uses a different formula for non-single-family structures: the side setback must equal the building's height but never less than 20 feet, and the rear setback must equal the building's height but never less than 25 feet.
4a scales the front setback up with height, from 40 feet at a 35-foot building up to 67 feet at 60 feet tall. D(1) governs how these numbers apply countywide: minimum setbacks apply to all buildings and structures as they relate to lot lines and public streets, with a short list of exceptions that never have to observe a setback at all: underground utility equipment, mailboxes, bus shelters, street lights, public bicycle shelters, and similar public-interest structures the Zoning Administrator finds harmonious with the surrounding area.
Interior units of single-family attached dwellings and stacked townhouses are exempt from the minimum side setback between the units themselves. 4, and setbacks provided to satisfy this Ordinance can never be reduced or reused to satisfy another lot's requirement.
Violations & Fines
Building or expanding a structure within the required setback without an approved modification 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, and the Zoning Administrator can order the encroaching portion removed or relocated.
Frequently Asked Questions
How close to my property line can I build in Fairfax County's R-1 district?
Do mailboxes and bus shelters have to meet the yard setback rules?
Do sheds and detached garages follow the same setback as the house?
Sources & Official References
Other rules in Fairfax County
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