Composite and wood decks with railings, laid out to the doors and the grade, framed to code. This page covers Mercersburg, plus Greencastle: 5 ZIP codes in Franklin 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 Mercersburg, Pennsylvania under PA178917. 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 Mercersburg, along with Greencastle. They are not a city-limit map of Mercersburg alone.
Photos on this page are examples of ExteriorMax work and the products we install. They are not a job at a specific address.
Greencastle, Mercersburg. Franklin County. Zone PA-FRANKLIN-GREENCASTLE-MERCERSBURG. ZIP codes: 17225, 17231, 17236, 17256, 17263.
From 2025-11-11 through 2026-11-11, National Weather Service severe reports for Franklin County include this headline: 23 severe storm reports in Franklin County. That is a county record. It does not mean every home in these ZIP codes experienced that weather. The estimate is based on the house, not the headline.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule. Financing details.
Yes. This page covers Mercersburg, plus Greencastle: 5 ZIP codes in Franklin County under PA178917.
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 We do not publish a separate permit fee for Mercersburg.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule.
Also in Mercersburg: Roofing in Mercersburg · Siding in Mercersburg · Windows in Mercersburg · Gutters in Mercersburg · Doors in Mercersburg.
Company-wide decks page · Composite and wood decks · Mercersburg overview
Greencastle decks · Chambersburg decks · Fort Loudon decks · Mont Alto decks · Path Valley decks · Waynesboro decks
Mercersburg, plus Greencastle. ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Mercersburg, Pennsylvania under PA178917. Maryland, Virginia, West Virginia, and Pennsylvania are authorized service areas. The business address is 6301 Ivy Ln, Suite 120, Greenbelt, MD 20770.