HVAC Permit in Montgomery County, Maryland

Permit required?

Yes, a permit is required.

When a permit is usually needed

For installation replacement repair or conversion 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.

Official fee schedule

Where to apply

• Official permit page
• Permit portal

Frequently asked questions

Do you need a hvac permit in Montgomery County?

A mechanical permit is required in Montgomery County for any work involving heating, ventilating, and air-conditioning systems including installation, replacement, repair, or conversion. ACCA Manual J Calculations (8th edition) are required when ductwork is being added to a new or existing system. One-for-one replacements are issued immediately upon application. Always confirm with the Montgomery County Department of Permitting Services before starting.

How much does a hvac permit cost in Montgomery County?

Fees are set by Montgomery County and are not published here. See the official fee schedule for current amounts.

How long does a hvac permit take in Montgomery County?

Processing time for a hvac permit in Montgomery County varies by workload and project scope. Contact the Montgomery County Department of Permitting Services for a current estimate.

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

You can apply through the Montgomery County permit portal or contact the Montgomery County Department of Permitting Services directly. The links are listed on this page.

Official sources

• https://www.montgomerycountymd.gov/department-permitting-services/all-permits/electrical-mechanical-permits/residential-mechanical-permit-process
• https://www.montgomerycountymd.gov/DPS/Process/combuild/residential-mechanical.html