Water heater permits in Fairfax and Northern Virginia

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Your mailing city may not be your permit office

This matters in Northern Virginia more than people expect:

• The City of Fairfax (fairfaxva.gov) is a separate jurisdiction from Fairfax County (fairfaxcounty.gov).
• Many “Alexandria, VA” mailing addresses (including several 223xx ZIP codes outside the city line) are in Fairfax County.
• Many “Falls Church” mailing addresses are in Fairfax County, not the City of Falls Church.
• Jobs in the Towns of Vienna or Clifton that use Fairfax County PLUS also need a separate town approval uploaded to the county record.

If you are unsure, the real estate assessment or tax record for the address names the jurisdiction. Check that first — it decides which portal the permit goes through.

Fairfax County (most of our Fairfax, Springfield, Reston, and Herndon pages)

Source: Household Appliance (HAPL) — Residential and Residential Plumbing, Fairfax County Land Development Services, retrieved 2026-11-13.

• Gas water heater: a permit is required, even for a like-for-like replacement. If no new gas piping is being installed, the usual path is a Household Appliance (HAPL) permit in PLUS. If new gas piping is part of the job, use a Residential Plumbing permit instead.
• HAPL applications are not plan-reviewed; after a complete filing and fee payment, the permit is issued automatically and must be followed by the required inspection.
• Chimney vent certification is required for replacement or installation of all fuel-burning appliances in existing buildings.
• Owners may pull permits in their own name; the county strongly recommends a properly licensed contractor as the responsible party.
• Vienna or Clifton: upload the town’s approval to the PLUS record (for example, “Town of Vienna Approval”).

Fairfax County also points to Virginia’s rule that gas appliances are not exempt. Electric same-type, same-size, same-location replacements generally fall under that exemption — confirm if anything about the job is not a straight swap.

City of Fairfax (the independent city)

Sources: City of Fairfax permit FAQs, residential gas permit, retrieved 2026-11-13. Apply through the City’s permit portal. Code Administration: 703-385-7830.

• A gas water heater needs a gas permit and a plumbing permit.
• An electric water heater needs an electrical permit and a plumbing permit.
• Gas hookups must be coordinated through Washington Gas, per the city’s gas-permit page.

Do not use Fairfax County PLUS if the property is inside the City of Fairfax.

Arlington County

Source: Plumbing / Gas Permit, Arlington County, retrieved 2026-11-13. Applications go through Permit Arlington.

• Replacing fixtures or elements on gas-fueled equipment requires a permit and inspections.
• On equipment not fueled by gas, replacement of the same type, size, and location does not require a permit, with further exemptions in §108.2 of the building code.
• Replacing a fuel-burning appliance involves vent or chimney review; a chimney vent certification is part of that process.

City of Alexandria

Applications go through the City’s APEX portal and the Department of Code Administration / Permit Center. Gas water heaters require a permit under the same statewide rule. The city’s published permit activity includes water heater replacements; do not assume an electric swap is exempt without checking Alexandria’s current permit-requirements page: alexandriava.gov/permits/permit-requirements.

And again: an “Alexandria” mailing address may actually be in Fairfax County. Check the jurisdiction first — it decides which portal the permit goes through.

Prince William County (Woodbridge and nearby)

Source: Do I Need a Permit?, Prince William County Building Development, retrieved 2026-11-13.

• Permits always required: “Replacing gas or oil furnaces, gas logs, or appliances (water heater, range, etc.).”
• Permits not required: “Replacing an electrical water heater with the same size heater in the same location.”
• The City of Manassas and the City of Manassas Park issue their own permits (outside our launch coverage).
• The county’s page also notes that apartment buildings and condos are treated as commercial projects, which is a different permit path than a one- or two-family home or townhouse.

What the inspector is usually looking at

Across these offices, a final inspection is there to catch the failures that cause carbon monoxide problems, gas leaks, scalds, and water damage:

• Gas connection, shutoff, and sediment trap
• Vent size, slope, and termination; chimney certification where required
• TPR valve and its discharge piping
• Expansion tank on a closed system
• Electrical connections and breaker sizing on electric units
• Clearances, pan, and drain where required

Emergency replacements

If a heater has already failed, Virginia’s code allows the work to start, with the permit application submitted by the end of the first working day after the work begins (13VAC5-63-80). That is an emergency timing rule, not permission to skip the permit. Leak first steps.

FAQ