ProVia replacement windows. Double-hung, casement, bay, bow, sliders, and awning, measured at the house. This page covers Thurmont, plus Walkersville and Mount Airy: 12 ZIP codes in Frederick County.
The style is chosen for how the opening should move. We confirm it at the in-home measure.
Both sashes move, and they tilt in so you can clean the outside glass from inside.
Cranks open up to 90 degrees for ventilation, then closes tight against the frame.
Bay, bow, and special-shaped combinations. Framing holds the projection. Flashing keeps it dry.
Horizontal sliders, awning, and single hung when the wall wants a different motion.
You can feel air moving near the frame, or the room by the window never warms up.
Condensation trapped inside the glass means the seal between the panes has failed.
Windows that stick, will not stay up, or will not lock.
Heating and cooling working harder every season often points to the openings.
ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Thurmont, 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 Thurmont, along with Walkersville and Mount Airy. They are not a city-limit map of Thurmont 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. Wind-driven rain is one reason a new window is foamed and flashed into the wall. We confirm that at the measure, not from a county headline.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule. Financing details.
These are company-wide reviews. They are not filed as Thurmont reviews, and we do not invent a local set.
One word: AWESOME. Roof replacement and all the windows. Chidi and Adam were professional. The installers were thorough.
Yes. This page covers Thurmont, plus Walkersville and Mount Airy: 12 ZIP codes in Frederick County under MD 142964.
Double hung, Casement, Bay and bow, Sliders and awning. The style is chosen for how the opening should move. We confirm it at the in-home measure.
Measured in person, Old unit out, opening checked, Foamed, flashed, and sealed, Trim 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 Thurmont.
$0 down financing for qualified homeowners. Plans are walked at the inspection. A small deposit holds the schedule.
Also in Thurmont: Roofing in Thurmont · Siding in Thurmont · Gutters in Thurmont · Doors in Thurmont · Decks in Thurmont.
Company-wide windows page · Signs a window needs replacement · Thurmont overview
Mount Airy windows · Walkersville windows · Brunswick windows · Frederick windows · Middletown windows · Urbana windows
Thurmont, plus Walkersville and Mount Airy. ExteriorMax installs roofing, siding, windows, gutters, doors, and decks in Thurmont, 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.