HVAC Permit in Fairfax County, Virginia

Permit required?

Yes, a permit is required.

When a permit is usually needed

For new installation or replacement of any HVAC system

Permit cost and what affects it

Fees are set by the locality and are not published here. See the official fee schedule or contact the office for current amounts.

Permit costs generally depend on the project valuation, the scope of work, and the inspections required. Ask the office how the fee is calculated for your specific project.

Where to apply

• Official permit page
• Permit portal

Frequently asked questions

Do you need a hvac permit in Fairfax County?

A mechanical permit is required in Fairfax County for all HVAC work including new installation, replacement, repair, or conversion of heating and cooling systems. HVAC Certification may also be required. Trade permits do not require plans and are obtained through the PLUS portal after the associated building permit is issued. Always confirm with the Fairfax County Land Development Services before starting.

How much does a hvac permit cost in Fairfax County?

Fees are set by Fairfax County and are not published here. Contact the office for current amounts.

How long does a hvac permit take in Fairfax County?

Processing time for a hvac permit in Fairfax County varies by workload and project scope. Contact the Fairfax County Land Development Services for a current estimate.

Where do you apply for a hvac permit in Fairfax County?

You can apply through the Fairfax County permit portal or contact the Fairfax County Land Development Services directly. The links are listed on this page.

Official sources

• https://www.fairfaxcounty.gov/landdevelopment/permit-library/mechanical-residential
• https://www.fairfaxcounty.gov/landdevelopment/when-permit-required