Where do I apply for a deck permit in Montgomery County?

Apply through DPS eServices, or call 311 (240-777-0311).

Do you need a permit for a deck in Montgomery County, MD?

Yes. Montgomery County requires a building permit for all decks, regardless of height above grade.

Every deck needs a building permit, whatever its height.

Decks must meet the zoning setbacks for the lot.

Rules last checked by a person on October 20, 2026. Guidance only; confirm with Montgomery County before you build.

Setbacks depend on your zoning district, and a flood zone can change the permit answer. Enter your address to see both.

Permit	When it applies
Building permit	Montgomery County requires a building permit for all decks, regardless of height above grade.
Floodplain development permit	If the lot is in a FEMA special flood hazard area, all development there needs a permit.

Stair lighting, outlets or a hot tub on the deck also need an electrical permit.
Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.

When does a deck need a building permit in Montgomery County?: Montgomery County requires a building permit for all decks, regardless of height above grade.
Where do I apply for a deck permit in Montgomery County?: Apply through DPS eServices, or call 311 (240-777-0311).

Montgomery County DPS, Guidelines for Building Residential Decks (rev. 04/15/2025). Checked 2026-10-19.
A building permit is required for all decks regardless of the height above grade.
44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...