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Energy codes, green building and upkeep in Fairfax County, VA

Houses follow the Virginia USBC (2021 edition), including its energy provisions. Code Compliance handles upkeep and occupancy problems in existing homes.

A person last checked these rules on October 20, 2026. This is guidance only, so confirm with Fairfax County before you build.

The details

  • New houses and additions meet the USBC energy provisions. Replacing an electric HVAC unit is exempt from permit.High confidence
  • Fairfax Code Compliance enforces property upkeep, multiple-occupancy and inoperable-vehicle rules on existing homes.Medium confidence
  • Residential EV charging is limited to Level 1 and 2.High confidence

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Common questions

Which energy, green-building and property-maintenance rules apply to a house in Fairfax County?
Houses follow the Virginia USBC (2021 edition), including its energy provisions. Code Compliance handles upkeep and occupancy problems in existing homes.

Sources

  1. Virginia USBC, 13VAC5-63-80 Section 108.2 (pools, mechanical, electrical and flood-area items). Checked 2026-10-21
    8. Swimming pools that have a surface area not greater than 150 square feet and are less than 24 inches deep... 14.4 Replacement of mechanical appliances provided the equipment is not fueled by gas or oil in Group R-2 where serving a single-family dwelling …
  2. Fairfax County Code Compliance, How many people can live in a home?. Checked 2026-10-21
    No more than four persons not related by blood or marriage functioning as a single household [§ 4102.3.A]... no more than one family, plus two renters, may live together as a single household... The presence of a second kitchen in a home does not automatica…
  3. Fairfax County Zoning Ordinance § 4102.7.A(5), (6), (17), rear setback coverage, freestanding accessory structures, swimming pools. Checked 2026-10-21
    All accessory structures and uses may cumulatively cover no more than 30 percent of the minimum rear setback on any lot located in a conventional residential district... [Coverage includes] children's play equipment, sports court, pool and associated deckin…
  4. Fairfax County Zoning Ordinance § 4102.7.P, solar collection system; § 4102.7.E, electric vehicle charging. Checked 2026-10-21
    A solar collection system mounted on the roof of a building... may extend up to five feet above the applicable maximum building height... Any accessory structure supporting a solar collection system, such as a canopy, must comply with height and setback req…

Disclaimer: This is general information, not legal or professional advice for any one property. Codes change. SetbackIQ is not a zoning determination, a permit, or a survey, and it does not replace an architect, engineer, or lawyer. Confirm with your building and zoning offices before you build, buy, or sign a contract.