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An alteration permit is required:

  • For all commercial properties
  • To add one or more basement bedrooms
  • For basement excavations
  • To convert unfinished basement space into a finished space:
    • If structural changes are involved or moving a bearing wall.
    • If the property is located in a Flood Zone, Historic District or the Chesapeake Bay Critical Area. Use the Permit Review Tool to determine if the property is in a flood zone.
    • When plumbing, gas fitting and electrical work are required, trade permits must be pulled by a Master Plumber or Electrician licensed with Baltimore County.

A building permit is not required to convert unfinished basement space into a finished space if the above items are not involved.

If property is served by a well and septic system, a site plan must be provided that complies with the Ground Water Site Plan Requirements.

Building Guidelines


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