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.