Do you need a permit for a pool or hot tub in Montgomery County, MD?
It depends on the details of your project.
Every pool needs a permit except a prefabricated pool less than 18 in deep.
Hot tubs need a permit too.
A pool is an accessory structure, so it follows the accessory setbacks for your zone and stays out of the front yard.
A person last checked these rules on October 20, 2026. This is guidance only, so confirm with Montgomery County before you build.
Check your exact lot
Your zoning district sets the setbacks, and a flood zone can change the permit answer. Enter your address to see both.
Permits a pool or hot tub can need in Montgomery County
| Permit | When it applies |
|---|---|
| Swimming pool or hot tub permit | DPS requires a permit for swimming pools and hot tubs. Only prefabricated pools under 18 in deep are exempt. |
| Electrical permit | Pumps, heaters, lights and bonding need an electrical permit.Medium confidence |
| Sediment control permit | Disturbing more than 5,000 sq ft, or moving 100 cubic yards of earth, needs a DPS sediment control permit. A big in-ground pool can cross the 100 cubic yard line on its own. |
| Floodplain development permit | All development in a FEMA special flood hazard area needs a floodplain permit. |
| Historic Area Work Permit (HPC) | On a Master Plan historic site or in a historic district, exterior changes need a Historic Area Work Permit from the Historic Preservation Commission before DPS issues other permits. |
Local details
- 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.
How to apply
- DPS eServices
- Department of Permitting Services
- MCAtlas zoning map
- Phone: 311 (240-777-0311)
Common questions
- When does a pool or hot tub need a building permit in Montgomery County?
- DPS requires a permit for swimming pools and hot tubs. Only prefabricated pools under 18 in deep are exempt. A prefabricated pool less than 18 in deep needs no permit in Montgomery County.
- Where do I apply for a pool or hot tub permit in Montgomery County?
- Apply through DPS eServices, or call 311 (240-777-0311).
Sources
- Montgomery County DPS, Permits Required list (land disturbance). Checked 2026-10-21
Land Disturbance (greater than 5,000 square feet or 100 cubic yards or more of earth movement) [likely requires a permit].
- 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...
- Montgomery Planning, Historic Area Work Permits. Checked 2026-10-21
Work requiring a HAWP includes but is not limited to the following: [new construction, additions, removing porches and other exterior work on Master Plan historic sites and properties in Master Plan historic districts, reviewed by the Historic Preservation …