Mechanical Permits


The new Momentum permitting system is live.  However, you will use the legacy ePermits online system for the following only:

  1. Cell Tower Permits
  2. Special Utility Permits
  3. Department of Environment Permits
  4. Electrical or Mechanical Permits that are associated with an existing permit in ePermits 
  5. For revisions to applications/permit prior to 5/1/23, you must utilize the existing revision process found here

For all other permits you must use Momentum by applying here.

Mechanical Permit applications are completed online. After you submit your information, please allow 24 hours for verification of your registration information before our department grants you access.
To obtain permission to apply for Mechanical Permits online, the Licensed/Master HVACR will need to register.

  1. First, complete the "Online Permit Application - Electronic Signature Acknowledgment Form"
  2. Next, register and/or create your user profile
  3. Finally, send an e-mail to DPIE at:

The e-mail information should contain the following information:

  • Company Name
  • E-mail Address (used as the login when setting up the profile)
  • HVACR MD State Issued License Number (the number shown in black text)
  • Completed Electronic Signature Form
  • Scanned copy of the latest HVACR MD State issued License
  • Scanned, color copy of the Master's Driver's License

Should you have any questions, please send an e-mail to:

Access the Online Permit Application in Momentum.


TRADE MANUALS — Step-by-Step Instructions with Visuals

VIDEOS — Mechanical Permits, parts 1–4

View the below videos on YouTube for assistance in completing your application.                 

Mechanical Permit Inspection Requirements

Residential mechanical systems not deemed to be part of a Third-Party Inspection Program (TPIP or TPIP-R) project, typically will be inspected by DPIE building inspector(s). This includes duct rough-in, system set-up per code.

The Master HVAC installer must submit an original Third-Party certification for the following:

  • System data information, distribution, zones covered.
  • System startup and performance testing.

The DPIE building inspector(s) will conduct a final visual quality assurance inspection of the system for approval.

All commercial mechanical systems are required to be inspected and certified by a Maryland Registered Professional Engineer contracted by the customer. The DPIE inspector(s) will conduct a final quality assurance inspection only and will obtain the original Third-Party certifications during the final inspection for mechanical installations which have not been deemed part of the Third-Party Inspection Program (TPIP).

Any Mechanical systems deemed part of a Third-Party Inspection Program (TPIP) project or having a total construction cost of $200,000 or more will be required to be a part of the Third-Party Inspection Program (TPIP), to include but not limited to Structural, Mechanical, Fire Protection, and Electrical inspections to be inspected and certified. Regardless of construction cost, the Building Code Official or designated representative may include or exclude a project from the TPIP due to its complexity, simplicity, or innovation.