Skip Navigation

A building permit is required for decks greater than 16 inches above the lowest grade and exceeding 120 square feet, and for all decks, regardless of size, that are:

  • Located in a proposed or designated Baltimore County Historic District
  • On the Baltimore County Landmarks List
  • Located in the floodplain
  • Located in the Chesapeake Bay Critical Area

Required Documents

You must provide the following when submitting your permit application.

  • Under 600 square feet—Site plan
  • 600 square feet and over—Construction plans and site plan
  • Over 3,000 square feet—Signed and sealed plans by a design professional licensed in the state of Maryland
  • 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

View the deck construction 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