Commercial Mechanical / HVAC Permits

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A City issued permit is required for all commercial heating, ventilation, and air conditioning (HVAC*) work.

Most mechanical / HVAC permits issued in the City of Gaithersburg are part of a combination permit, where the building plans are complete drawings that show architectural/building work, mechanical/HVAC work, plumbing and electrical work. However, there are times when a separate, stand-alone mechanical/HVAC permit is needed. Here are some examples of when an HVAC permit is needed:

  • Installation and/or replacement of an air conditioner, condenser, furnace, heat pump, exhaust fan, boiler, cooling tower, etc.
  • Fire and/or smoke dampers.
  • Commercial clothes dryers, clothes dryers in multifamily buildings.
  • Commercial walk in coolers and freezers.
  • Significant changes to the ductwork of an existing system.
  • Installation of a commercial kitchen exhaust system. (Note: The fire suppression system requires a separate permit from the City Fire Marshal’s office. See - Fire Protection Permits.

Requirements for permit:

  • A fully completed application form.
  • Installer must hold a current State of Maryland Master’s HVACR license.
  • Factory specification sheets for any/all units being installed.
  • Payment of the permit fee when required.

* Sometimes the acronym is seen as HVACR; in that case, the R stands for refrigeration.