Backyard project permits in Montgomery County, MD
Montgomery County is one of the strictest places in the country for small projects. Every shed, deck and fence needs a permit, whatever its size.
Rules last checked by a person on October 20, 2026. Guidance only; confirm with Montgomery County before you build.
| Typical project | Permit? |
|---|---|
| Shed10 by 12 ft shed, 10 ft tall, no power | Yes: Building permit |
| Deck160 sq ft freestanding deck, 24 in high | Yes: Building permit |
| Fence6 ft wood fence in the back yard | Yes: Fence permit |
| Garage24 by 20 ft detached garage with lights | Yes: Building permit, Electrical permit |
| ADU650 sq ft detached backyard cottage | Yes: Building permit, Zoning review and ADU rental license |
Check your exact lot
Permit office
Montgomery County building code (2021 IRC as amended) and Zoning Ordinance (Chapter 59).
- DPS eServices
- Department of Permitting Services
- MCAtlas zoning map
- Phone: 311 (240-777-0311)