Natalie’s Library
Do I need a permit for a home addition in Gaithersburg?
Natalie’s answer
“Yes, home additions in Gaithersburg require permits from Montgomery County for any structural, electrical, plumbing, or mechanical work; only purely cosmetic changes like paint or flooring typically do not. MOSS handles the entire Montgomery County permitting process on your behalf, from preparing scaled drawings to coordinating all required inspections through final approval.”
Yes, a home addition in Gaithersburgalmost certainly requires one or more permits from Montgomery County's Department of Permitting Services, and virtually every element of that addition will be reviewed. Structural work, new foundations, framing, load-bearing walls, and roof ties, triggers a building permit. Any new or relocated electrical circuits, plumbing rough-in, gas lines, or HVAC equipment each require their own trade permits alongside it. Egress windows and exterior doors are also code-regulated elements. The only work that typically escapes permitting is purely cosmetic: paint, flooring, cabinetry that involves no plumbing or electrical, and similar finish-level changes. Montgomery County's review timeline for a complete residential addition submission generally runs 10 to 15 business days for initial review, with resubmissions adding 7 to 10 days per cycle if revisions are needed, and most projects reach final permit issuance within 20 to 30 days of a complete filing.
At MOSS, pulling the permit is our responsibility, not yours. Our design team prepares the detailed, scaled drawings and specifications that Montgomery County requires, including the completed residential remodeling permit application, and submits the full package directly to the Department of Permitting Services on your behalf. We track the review, respond to any comments, coordinate resubmissions if needed, and schedule every required inspection from rough-in framing and mechanical through final sign-off. You never have to navigate county offices or interpret correction letters; we handle that entireprocess so your project stays on schedule.
Permitting does more than satisfy a legal requirement, it creates a documented record that every phase of construction met current building and safety codes, which matters enormously when you sell or refinance your home. An unpermitted addition can complicate a title search, trigger lender concerns, or require expensive retroactive inspection. If your Gaithersburg neighborhood has a homeowners association, there is another layer to consider: many HOA architectural review committees must approve exterior modifications before Montgomery County will issue the permit. MOSS manages that parallel process as well, providing the renderings and documentation your architectural review board needs so both approvals move forward together without unnecessary delays.