Do I need an HVAC permit in Arlington, VA? The like-for-like exemption, the gas exception and zoning

Arlington's rule

From the County's Mechanical Permit page, read 23 October 2026, which points to Section 108.2 of the Virginia Uniform Statewide Building Code (13VAC5-63-80) for further exemptions:

Three Arlington specifics. Zoning: "If a permit is not required, contact Zoning for approval of the location of any outdoor equipment," so an exempt condenser swap still needs a zoning check if the unit sits near a lot line. Commercial houses: "Some residential properties are considered commercial per the Building Code and therefore require a commercial permit," and the application asks which yours is. Vents: fuel-burning installations need a chimney or vent inspection on the County's Chimney Vent Certification form. When in doubt, the Inspection Services Division is on 703-228-3800.

Who can pull it

Virginia lets "the owner or lessee of the relevant property or the agent of either" apply, as well as the contractor (USBC 108.3). Arlington's Permit Arlington Roles page says the contractor "Must meet specific licensing criteria (specialty / class)" and the County "strongly suggest[s]" naming the contractor as Permit Holder, with a notarized affidavit when it is not. The Mechanical page adds that a Permit Authorization Affidavit may be needed depending on who holds and who applies.

An HVAC contractor holds a DPOR contractor license with an HVAC specialty, and its class caps the job: Class C up to $30,000 a job, Class B to $150,000 (Code of Virginia 54.1-1100). 94.2% of Arlington HVAC firms in our file matched an active DPOR license. Check yours on DPOR's License Lookup (steps).

How the County processes it

From the Mechanical page:

1. Apply online in Permit Arlington. If a building permit exists, mechanical plans go under it.
2. Completeness check within 2 business days.
3. Review, up to 2 business days for residential work; revisions if comments are issued.
4. Final processing within 2 business days: contractor verification and fee calculation. Pay online.
5. Post the permit and placard once paid; the approved plan set follows in about 2 business days.
6. Inspections. "The onsite individual must contact the assigned inspector the morning of the inspection, or it will be cancelled."

Fees come from separate Inspection Services, Zoning and DES schedules, and some permits draw on more than one. We could not read a current residential mechanical fee table on the County's site, so the invoice is the figure to plan on.

What 2,807 Arlington HVAC permits show

Arlington HVAC firms finish their permits: 86.9% reached final, and only 4 of 56 busy firms finished under 70%. Two of the five busiest filers, Hearth & Home Technologies LLC and Chesapeake Hearth and Stone Company LLC, are hearth firms: fireplace and insert work sits in this count alongside furnaces and heat pumps. Filing peaks in October, ahead of the heating season. The middle half of firms' usual jobs, $4,000 to $12,320, is a fair check on a system replacement quote. Local prices: Arlington HVAC cost; national ones: HVAC replacement cost.

See every Arlington HVAC contractor by finished permits →

Check it in five minutes

1. Ask for the DPOR license number, then confirm the class and HVAC specialty on License Lookup.
2. After the job, search your address in Permit Arlington for the permit and its final (how).
3. Compare firms on the Arlington HVAC list; counts by year on Arlington permit statistics.

Gas lines and water heaters: Arlington, VA plumbing permit; new circuits for a heat pump: Arlington, VA electrical permit. Other places: do I need a permit for HVAC replacement.

What this does not tell you

Like-for-like electric swaps that needed no permit leave no record, so our count under-represents simple electric swaps. Fireplace and hearth work is counted with HVAC. A filed value is the applicant's figure. We could not verify the County's mechanical fee amounts.