Composite and wood decks with railings, laid out to the doors and the grade, framed to code. This page covers Dickerson, plus Poolesville and Barnesville: 5 ZIP codes in Montgomery 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 Dickerson, 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 Dickerson, along with Poolesville and Barnesville. They are not a city-limit map of Dickerson alone.
Photos on this page are examples of ExteriorMax work and the products we install. They are not a job at a specific address.
Poolesville, Barnesville, Dickerson. Montgomery County. Zone MD-MOCO-UPCOUNTY. ZIP codes: 20837, 20838, 20839, 20841, 20842.
From 2025-11-11 through 2026-11-11, National Weather Service severe reports for Montgomery County include this headline: 60 mph winds recorded in Montgomery 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 Dickerson, plus Poolesville and Barnesville: 5 ZIP codes in Montgomery 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 We do not publish a separate permit fee for Dickerson.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule.
Also in Dickerson: Roofing in Dickerson · Siding in Dickerson · Windows in Dickerson · Gutters in Dickerson · Doors in Dickerson.
Company-wide decks page · Composite and wood decks · Dickerson overview
Barnesville decks · Poolesville decks · Bethesda decks · Burtonsville decks · Chevy Chase decks · Clarksburg decks · Damascus decks · Gaithersburg decks
Dickerson, plus Poolesville and Barnesville. ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Dickerson, 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.