Composite and wood decks with railings, laid out to the doors and the grade, framed to code. This page covers Mount Airy, plus Walkersville and Thurmont: 12 ZIP codes in Frederick County.
The layout is matched to the doors and the yard. Material is chosen at the estimate.
Sized to the house and laid out for how you actually use the yard.
Boards that hold color and skip the yearly stain.
Pressure-treated wood when the house wants real boards.
Stairs, rails, and code-right infill that finish the elevation.
Boards that flex, crack, or stay dark and damp.
Posts and rails that move when you lean on them.
Nails backing out and fasteners bleeding rust.
Gaps where the deck meets the house, or stairs that shift.
ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Mount Airy, Maryland under MD 142964. Maryland, Virginia, West Virginia, and Pennsylvania are authorized service areas. The business address is 6301 Ivy Ln, Suite 120, Greenbelt, MD 20770.
The ZIP codes below are the zone list that names Mount Airy, along with Walkersville and Thurmont. They are not a city-limit map of Mount Airy alone.
Photos on this page are examples of ExteriorMax work and the products we install. They are not a job at a specific address.
Walkersville, Thurmont, Mount Airy. Frederick County. Zone MD-FRED-NORTH-EAST. ZIP codes: 21727, 21759, 21762, 21770, 21771, 21774, 21775, 21778, 21788, 21792, 21793, 21798.
From 2025-11-11 through 2026-11-11, National Weather Service severe reports for Frederick County include this headline: 58 mph winds recorded in Frederick County. That is a county record. It does not mean every home in these ZIP codes experienced that weather. A county wind headline is not a deck inspection. Soft boards, loose ledgers, and wobbly rails are what we look at on site.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule. Financing details.
Yes. This page covers Mount Airy, plus Walkersville and Thurmont: 12 ZIP codes in Frederick County under MD 142964.
Signature decks, Composite, Wood, Railings. The layout is matched to the doors and the yard. Material is chosen at the estimate.
Laid out with you, Footings and ledger, Boards and fasteners, Rails, stairs, and walkthrough.
Permit rules differ by county. ExteriorMax handles the permit and HOA packet for the job. We do not publish a separate permit fee for Mount Airy.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule.
Also in Mount Airy: Roofing in Mount Airy · Siding in Mount Airy · Windows in Mount Airy · Gutters in Mount Airy · Doors in Mount Airy.
Company-wide decks page · Composite and wood decks · Mount Airy overview
Thurmont decks · Walkersville decks · Brunswick decks · Frederick decks · Middletown decks · Urbana decks
Mount Airy, plus Walkersville and Thurmont. ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Mount Airy, Maryland under MD 142964. Maryland, Virginia, West Virginia, and Pennsylvania are authorized service areas. The business address is 6301 Ivy Ln, Suite 120, Greenbelt, MD 20770.