Replacement Windows & Window Installation in Pittsburgh

Ireland Contracting installs replacement windows across Pittsburgh and Western PA: Pella wood-clad, Marvin wood, and ProVia vinyl units, measured to your openings and installed by our own crews rather than a subcontractor. From a single leaking window to a whole-home replacement, the result is a draft-free fit, clean trim inside and out, and lower heating bills through a Pittsburgh winter.

Most of the windows we replace are original to the house: rope-and-pulley wood sashes in Mt. Lebanon, Bellevue, and Squirrel Hill, or first-generation vinyl from the 1990s that has fogged between the panes. Either way, the symptoms are the same: drafts you can feel from the couch, condensation on the inside glass, sashes that won't stay up, and a furnace that runs all night. A modern double- or triple-pane window with low-E glass and an argon fill fixes all of it at once.

We install three brands so the frame material matches the house and the budget. ProVia vinyl is the value choice for most homes: low-maintenance, well insulated, and backed by a lifetime transferable warranty. Pella wood-clad windows give you real wood inside with an aluminum exterior that never needs painting, which suits the region's brick and stone homes. Marvin wood windows are for historic and custom work where the profile and the species matter. We'll show you all three side by side and tell you which we'd put in your house.

Full-frame or insert? An insert (pocket) replacement keeps your existing frame and trim and is the faster, less expensive route when the old frame is sound. A full-frame replacement removes everything down to the rough opening so we can inspect and reflash the sill, the right call when there's rot, water staining, or you want to change the window size. We check the frames on the measure visit and recommend one or the other, not both.

One thing we don't do: window repair. We don't replace glass, reglaze sashes, or fix balances on existing units. If a window has failed, we replace the whole unit properly rather than patching it, and we'll tell you honestly if it's only one or two windows that need it.

Watch a window job from measure to walkthrough in our window replacement videos .

Replacing windows and siding together lets us do the trim and flashing once. See our Pittsburgh siding installation .

Replacing windows in Pittsburgh's older homes

Pittsburgh's housing stock is old. Most of the homes we work on in Allegheny County were built before 1960, and a lot before 1930. Those houses have plaster returns, out-of-square openings, and original wood frames that have been painted a dozen times. Replacing windows in them is a different job than in a 2005 subdivision: openings are measured individually, sills often need rebuilding, and any home built before 1978 is handled under EPA lead-safe work practices when we disturb painted trim.

The climate matters too. Our winters push heat out through single-pane glass and uninsulated frames, and freeze-thaw cycles work water into any gap around the unit. That's why we foam and flash every opening rather than relying on caulk, and why we steer most homeowners to a low-E, argon-filled double pane at minimum, the upgrade you feel most on a January night.

Because we also do siding, soffit, and fascia, we finish the exterior side properly: capped in aluminum or trimmed in Azek to match the house, so there's no bare wood left to weather.

What's included

• Pella, Marvin, and ProVia replacement windows
• Installed by our own crews, not subcontractors
• Insert or full-frame replacement, recommended per window
• Double- and triple-pane, low-E, argon-filled glass packages
• Interior and exterior trim finished in Azek or aluminum wrap
• Licensed PA #026195, free itemized estimates since 1994

Options we offer

• ProVia vinyl windows
• Pella wood-clad (EnduraClad aluminum exterior)
• Marvin wood and fiberglass windows
• Double-hung and single-hung
• Casement and awning
• Sliding and picture windows
• Bay and bow windows
• Specialty shapes and egress windows

Our windows process

1. 1 In-home measure & consult. We measure every opening, check the frames and sills, and help you choose brand, frame material, style, and glass package for each room.
2. 2 Custom order. Your windows are built to your exact opening sizes, typically four to eight weeks depending on brand and options.
3. 3 Installation. Our crew removes the old units, sets, shims, foams, and flashes the new ones, and finishes interior and exterior trim. A handful of windows is usually a day; whole-home jobs one to two days.
4. 4 Final walkthrough. We operate and lock every window with you, register the manufacturer warranty, and leave the house clean.

Windows across Western PA

We provide windows throughout the Greater Pittsburgh area and Western Pennsylvania, including:

• Allegheny County
• Butler County
• Washington County
• Westmoreland County
• Beaver County
• Glenshaw
• Wexford
• Gibsonia
• Fox Chapel
• Sewickley
• Shaler
• Mount Lebanon
• Upper St. Clair
• Bethel Park
• Monroeville
• Cranberry Township
• Mars
• Butler
• McMurray
• Canonsburg
• Murrysville
• Monaca
• Beaver Falls
• Beaver
• Aliquippa
• Conway
• Chippewa
• Darlington
• Freedom
• Baden