When is a Building Permit Required?

We have had lots of people asking When is a Building Permit Required in Montgomery County MD?

Here is your Answer:
If you are building, installing, and/or altering any of the following you may need a building permit:

Addition
Basement-existing
Deck
Driveway (apron only)
Electrical Work
Exterior Work on Historic Property
Fence
Fire Repair
Garage
Hot tub
HVAC/Heating (replacing)
Interior Alteration
Retaining Wall
Replacing structural members of roof framing, including sheathing
Solar Panels
Shed
Signs
Sunroom
Swimming Pool
A wood burning stove/fireplace installation
Change the size of doors and windows or make new openings for same
Change a building’s use
Structural alterations

Source
permittingservices.montgomerycounty