Montgomery County has the strictest shed permit policy in Maryland — a building permit is required for every single shed, regardless of size. No 150-square-foot exemption, no skids loophole, no exceptions. That means before your shed is delivered, you need an approved permit in hand. This guide covers exactly what that process looks like: the Fast Track path for sheds under 200 square feet, site plan requirements, setback and size rules, permit fees, required inspections, and the important municipality wrinkle that catches homeowners in Rockville, Gaithersburg, and Takoma Park off guard.