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A mechanical permit is required when:

  • Ductwork is being installed in a dwelling that does not have ductwork, or additional ductwork not covered by other permits
  • Mechanical work was not included with the scope of work for an existing building permit
  • Additional mechanical work is being completed
  • Smoke control systems and smoke removal systems require mechanical permits and must be applied for on separate applications from the building permit

A separate electrical, plumbing/gas permit may be required depending on the system being installed. These would be applied for by a licensed electrician or plumber/gasfitter contractor with Baltimore County.

Required Documents

  • Construction Plans
  • Data Sheets—Only required for commercial permits, unless waived by the Building Plan Review division.

About the Application Process

To learn more about the application process, read the steps and watch the videos below, or view the FAQ or full tutorial video playlist.

 Apply for a Permit

Once you have reviewed the process outlined above and have gathered your required documentation, apply for your permit online using the buttons below.


Explore Permits, Approvals and Inspections


Contact Us

Department of Permits, Approvals and Inspections

County Office Building
111 West Chesapeake Avenue
Towson, Maryland 21204


Monday through Friday
8:30 a.m. to 4:30 p.m.



C. Pete Gutwald