Which permit applies to your replacement
Fairfax County (through its Land Development Services department) has two permit paths for a residential water heater:
- Household Appliance permit (HAPL) — for a direct replacement with the same fuel type where no new gas piping is being installed. This covers the large majority of residential swaps, gas and electric alike.
- Residential Plumbing permit (PLBR) — required when the project includes new gas piping, such as converting from electric to gas or relocating a gas unit.
Note that gas water heaters need a permit even for an identical like-for-like replacement — “it’s the same unit” is not an exemption under the Virginia Residential Code.
What the inspection actually checks
The permit comes with one county inspection after installation. The inspector is verifying the things that keep a water heater from becoming a hazard:
- Venting on fuel-burning units — flue connections and draft, so combustion gases leave the house instead of entering it. Fairfax County also requires a chimney vent certification for fuel-burning appliance replacements.
- Temperature & pressure relief valve and its discharge pipe — the safety device that prevents a tank from over-pressurizing.
- Water and gas connections — leak-free, correctly sized, with proper shutoffs.
- Code details like expansion control, drain pans where required, and clearances.
Who pulls the permit — and why it should be the plumber
Fairfax County allows property owners to apply for the permit themselves, but the county itself recommends the licensed contractor pull it as the responsible party. When your plumber pulls the permit, the plumber — not you — is on the hook for code compliance, scheduling the inspection, and fixing anything the inspector flags. A contractor who asks you to pull the permit for work they’re doing is shifting that liability onto you; treat it as a red flag.
What happens if you skip the permit
- Home sale problems. Unpermitted water heater work is a common find in pre-sale inspections, and resolving it after the fact costs more than doing it right.
- Insurance risk. If an unpermitted unit leaks or fails, an insurer may scrutinize the claim.
- Safety. The inspection exists because bad venting and missing relief valves are genuinely dangerous — carbon monoxide and scalding-pressure failures are the exact things it screens for.
The permit fee is modest relative to the cost of the job, and a plumber who handles permits routinely can usually have one issued within a couple of business days. For current fees and forms, see the county’s Household Appliance permit page.
Outside Fairfax County?
The permit requirement comes from the statewide Virginia code, so the answer is “yes, a permit” across Northern Virginia — but each jurisdiction (the City of Fairfax, Falls Church, Arlington, Loudoun, Prince William) runs its own permit office with its own forms and fees. Wherever you are, the same rule of thumb applies: the installer should pull the permit and meet the inspector.
Replacing a water heater in Fairfax County? We handle the permit and inspection as part of the job and quote the full price upfront. Call (703) 832-9090 or see our water heater service.