





Window Installation Pittsburgh, PA
Andersen & Pella Replacement Windows Installed by Trusted Local Specialists
When you need window installation in Pittsburgh, PA, choosing the right installer matters just as much as choosing the right product. At Window Installation Specialists, we help homeowners throughout Pittsburgh and surrounding Western Pennsylvania communities upgrade their homes with expertly installed Andersen and Pella replacement windows and doors. The company highlights nearly 50 years of experience, service throughout the Pittsburgh area, and a focus on premium brands and professional installation.
Whether you are replacing old drafty windows, improving energy efficiency, updating curb appeal, or investing in long-term home value, our team delivers the craftsmanship and guidance homeowners deserve.
15 Years in a Row!
Trusted Pittsburgh Window Installation Specialists
Your windows affect comfort, appearance, insulation, and efficiency every day. Poor installation can lead to drafts, water intrusion, air leaks, and expensive problems later. That is why homeowners across the Pittsburgh area turn to Window Installation Specialists for careful, high-quality installation backed by decades of hands-on experience. The current site states that installations are handled by experienced professionals rather than subcontracted crews and that the company focuses on proper sealing, insulation, and long-term performance.
We believe every home deserves a custom solution, not a one-size-fits-all sales pitch. Our approach is built around honest recommendations, premium products, and detailed workmanship that helps your new windows perform the way they should.
Our Replacement Window Installation Process
A clear, proven sequence refined over five decades of installations across Western Pennsylvania — from your first consultation to the final walkthrough.
Consultation & Planning
We visit your home to understand your goals, assess your existing windows, and answer your questions in person.
Our installers take precise, on-site measurements to ensure every window and door is built for an exact fit.
Selection & Ordering
We help you choose the right style, material, and performance features from Andersen®, Pella®, Marvin®, and Therma-Tru®.
Your windows and doors are ordered to the exact specifications of your home, built to your selected products.
Installation Day
Our employee installers carefully remove your old windows, protecting your home’s interior and exterior throughout.
InstallationMasters™ Certified craftsmen install your new windows and doors to manufacturer specifications.
We insulate and seal around each unit to eliminate drafts and maximize energy efficiency.
Trim work is finished on both sides of the window or door for a clean, polished, weathertight appearance.
Finishing & Walkthrough
Every installation is inspected to confirm proper operation, sealing, and finish before we consider the job done.
We remove all debris and old materials, leaving your home as clean as we found it.
Premium Windows & Doors, Matched to Your Home
We don’t sell a single house brand. As InstallationMasters™ Certified installers, we carry three of the most respected names in the industry, and we’ll help you choose the one that actually fits your home, your budget, and how you live in it.
Andersen® Windows
Premium Wood & CompositeBest for homeowners seeking premium wood and composite replacement windows.
Andersen has spent more than a century building a reputation as one of the most trusted names in North American window manufacturing, and that reputation is earned through material science as much as tradition. Their signature innovation is Fibrex composite, a proprietary blend of reclaimed wood fiber and polymer that resists the warping, rotting, and swelling that plague traditional wood frames while still delivering the warmth and dimensional stability homeowners want from a true wood-look window. For homeowners with historic or architecturally distinctive properties, Andersen’s wood-interior lines pair that composite exterior shell with real wood on the interior face, giving you weather resistance outside and an authentic, stainable wood surface inside that matches original trim and millwork.
Where Andersen really separates itself is in customization. Their product lines span nearly every window operating style, casement, double-hung, awning, bay, bow, and specialty shapes, and they offer an extensive range of exterior colors, interior wood species, hardware finishes, and grille patterns. That flexibility matters enormously on older Pittsburgh homes, brick colonials, and Victorians where matching an existing architectural character isn’t optional; it’s the whole point of the project. Andersen’s High-Performance Low-E4 glass options are also engineered specifically for four-season climates like ours, balancing winter heat retention with summer solar heat rejection so the same window performs well in a January cold snap and a July heat wave.
We recommend Andersen most often to homeowners who want a premium, architecturally flexible window and are planning to stay in their home long enough to value the investment. Between the Fibrex composite performance, the depth of the customization catalog, and Andersen’s long-standing warranty coverage, it’s a product built for decades of ownership, not just resale season.
Pella® Windows
Vinyl, Fiberglass & WoodIdeal for vinyl, fiberglass, and architecturally accurate wood windows.
Pella’s strength is breadth. Rather than specializing in a single material, they manufacture serious product lines in vinyl, fiberglass, and wood, which means we can put a genuinely well-engineered Pella window into almost any budget or performance target a homeowner brings us. Their vinyl lines are built for homeowners who want reliable, low-maintenance performance at a more accessible price point without sacrificing structural integrity, while their fiberglass lines step up in strength and thermal performance for homes that need to stand up to more demanding conditions, larger openings, taller frames, or exposure to harsher weather.
What sets Pella apart for us as installers, though, is how seriously they take architectural accuracy. Their wood window lines are designed with historically correct sightlines, authentic muntin profiles, and traditional proportions that read correctly on period homes, which is a real concern in neighborhoods with historic Pittsburgh housing stock, brick colonials, and farmhouse-style construction where an off-the-shelf modern profile visibly clashes with the original design. Pella’s Insynctive smart technology, available on select lines, also lets homeowners monitor whether windows are open, closed, or locked from a phone, a feature that’s become increasingly popular for homeowners managing security and energy use across a larger property.
We typically point homeowners toward Pella when they want flexibility across material and price without giving up authentic detailing. It’s a product line that lets us match the right material to the right application, vinyl for a straightforward budget-conscious replacement, fiberglass for strength and performance, or wood for a historically accurate restoration, all under one manufacturer’s warranty and support structure.
Therma-Tru® Doors
Fiberglass Entry DoorsIndustry-leading fiberglass entry doors offering exceptional durability and energy efficiency.
Therma-Tru built its name specifically on fiberglass entry door systems, and it remains one of the most widely specified names in that category for a simple reason: fiberglass solves the two biggest failure points of a traditional wood entry door. It won’t rot, warp, or split from exposure to Western Pennsylvania’s freeze-thaw winters and humid summers, and it holds paint and stain finishes far longer than wood without the recurring maintenance cycle. Their door skins are also molded from real wood grain, so from a few feet away a stained Therma-Tru door reads as authentic wood grain and texture, not a synthetic substitute, while performing like a manufactured composite underneath.
Energy performance is the other half of the equation, and it’s where fiberglass construction genuinely outperforms both wood and steel. Therma-Tru door systems use a polyurethane foam core that delivers meaningfully higher insulating value than a solid wood slab, paired with compression weatherstripping and multi-point locking hardware on many lines that pulls the door tight against the frame at multiple points rather than a single latch, cutting down on the drafts and air infiltration that are common failure points on older, worn entry doors. For a home’s main entry, the door with the most traffic and the most direct weather exposure of any opening in the house, that combination of insulation and a tight seal has a real, noticeable effect on comfort near the front hall.
We install Therma-Tru most often for homeowners replacing a tired, drafty, or weather-damaged entry door who want a long-term, low-maintenance upgrade that still looks like a genuine wood door. With glass insert options, panel styles, and finish systems ranging from classic to contemporary, it’s a product that fits nearly any home’s curb appeal goals while solving the practical problems that send most homeowners looking for a new entry door in the first place.
Home Improvement Hour with Rob Pratte on KDKA (1020AM).
Understanding Your Window Replacement Options
Replacing windows involves real technical decisions. Here’s what our installers tell homeowners before every project, in plain language.
01Difference Between Window Replacement and New Construction Windows
Replacement windows are built to fit inside your existing frame, which stays in place along with your home’s exterior trim and siding. This keeps the project fast and avoids disturbing surrounding walls. New construction windows include a nailing fin and are designed to be installed into open framing, typically during a build or a full-frame renovation where the old frame and exterior trim are being removed entirely. For most homeowners updating an existing home, replacement windows are the right category; new construction windows come into play on additions, full gut renovations, or new builds.
02Double Pane vs Triple Pane
Double pane windows use two glass layers with an insulating gas-filled gap between them, and they’re the standard choice for most homes in our region, balancing cost, energy performance, and weight. Triple pane windows add a third layer of glass and a second gas-filled gap, which improves insulation and sound dampening further, at a higher price and added window weight. We generally recommend triple pane for north-facing rooms, homes right along busy roads, or homeowners specifically prioritizing maximum energy efficiency; for most standard replacement projects, a quality double pane window with good Low-E glass delivers excellent performance for the investment.
03Window U-Factor Explained
U-Factor measures how well a window prevents heat from escaping your home, rated on a scale where lower numbers mean better insulation. It’s the single most important number on a window’s energy label for our climate, since Western Pennsylvania winters put a real premium on heat retention. A window with a low U-Factor keeps more of your heating dollars inside the house instead of leaking out through the glass and frame. When we walk homeowners through product options, U-Factor is usually the first spec we point to, ahead of glass appearance or frame color, because it has the most direct impact on your monthly energy bill.
04Low-E Glass Benefits
Low-E, short for low-emissivity, is a microscopically thin metallic coating applied to the glass that reflects infrared heat while still letting visible light pass through normally. In winter, it reflects your indoor heat back into the room instead of letting it radiate out through the glass. In summer, it reflects the sun’s heat before it enters the home, reducing air conditioning load. The coating also blocks a significant portion of UV light, which slows the fading of carpets, furniture, and flooring near windows. Nearly every window we install today includes some tier of Low-E coating, because the comfort and efficiency gains are substantial relative to the cost.
05Argon vs Krypton Gas
Both gases are used to fill the sealed space between window panes in place of ordinary air, since they conduct heat more slowly and improve insulation. Argon is denser than air, more affordable, and performs best in the wider gas gaps typical of double pane windows, making it the standard choice for most residential installations. Krypton is denser still and performs better in narrower gaps, which makes it useful in triple pane windows or slim-profile frames where there isn’t room for a wide gas cavity, but it costs considerably more to manufacture. For most double pane replacement projects, argon delivers the better value; krypton earns its higher price mainly in triple pane or space-constrained applications.
06What Causes Window Seal Failure?
The seal between glass panes is what keeps the insulating gas in and moisture out. Over time, constant expansion and contraction from temperature swings, sun exposure, and simple age can stress that seal until it fails. Once it does, humid outside air works its way into the gap, and you’ll typically notice permanent fog, cloudiness, or condensation trapped between the panes that no amount of cleaning removes. Poor original installation, inferior seal materials, and direct sun exposure on south- and west-facing windows all accelerate this failure. A foggy pane between the glass is one of the clearest signs a window has reached the end of its useful life.
07Signs You Need New Windows
A few patterns show up consistently on the homes we visit: windows that are difficult to open, close, or lock; visible drafts near the frame even when the window is shut; condensation or fog trapped between the panes; wood that’s soft, rotted, or showing water damage around the sill or frame; single-pane glass in a home that hasn’t been updated in decades; and a noticeable jump in heating or cooling bills without another clear cause. Any one of these on its own is worth a look. Several of them together, especially on windows original to an older home, are a strong signal that replacement will pay for itself in comfort and efficiency.
08How Proper Installation Affects Energy Efficiency
Even the best-engineered window will underperform badly if it’s installed poorly. Most real-world air leaks happen around the perimeter of the window, not through the glass itself, at the gap between the window frame and the rough opening in your wall. Proper installation means correctly shimming the unit level and square, fully insulating that perimeter gap without over-compressing the insulation, and sealing it with the right air-sealing materials on both the interior and exterior sides. This is exactly why we use our own employee installers rather than subcontractors: installation quality has as much impact on your actual energy bill as the window product itself, and it’s the part homeowners can’t easily inspect once the trim goes back on.
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Proudly Serving Western Pennsylvania
From the city of Pittsburgh out through the North Hills, South Hills, and surrounding suburbs, our employee installers bring the same InstallationMasters™ Certified craftsmanship to every home we visit.
PittsburghHome base since 1973
- Cranberry Township
- Wexford
- McCandless
- Fox Chapel
- Upper St. Clair
- Peters Township
- South Hills
- Bethel Park
- Mt. Lebanon
- Irwin
- North Huntingdon
- Murrysville
- Greensburg
- Monroeville
- Plum
- Penn Hills
- Sewickley
- Robinson Township
- Moon Township

Meet Bill Kish
Bill Kish has been installing replacement windows since 1973 and has spent more than five decades helping homeowners throughout Western Pennsylvania improve their homes.
His expertise has been featured on KDKA Radio’s Home Improvement Hour, where he has answered homeowner questions for many years.
Bill personally oversees projects and remains involved in helping homeowners choose the right windows and doors for their homes.
Featured expert, KDKA Radio’s Home Improvement HourAnswering homeowner questions on window and door installation for years on air
Top 10 FAQs – Wood, Fiberglass & Composite Window Installation in Pittsburgh
1. What types of window materials do you install in Pittsburgh?
We specialize in premium window materials including wood, fiberglass, Fibrex® composite (Andersen), and advanced composite options (Pella). These materials offer superior durability, energy efficiency, and long-term performance compared to standard vinyl windows.
2. What are the benefits of wood windows?
Wood windows provide a timeless, high-end look, excellent insulation, and the ability to be painted or stained to match your home. They are ideal for homeowners looking for classic aesthetics with strong energy performance.
3. Why choose fiberglass windows for your home?
Fiberglass windows are known for their strength, durability, and resistance to warping, cracking, and temperature changes. They are a great option for Pittsburgh homes due to their ability to handle seasonal weather fluctuations.
4. What is Fibrex® and how is it different from vinyl?
Fibrex® is Andersen’s exclusive composite material made from reclaimed wood fibers and thermoplastic polymer. It is stronger, more energy-efficient, and longer-lasting than vinyl, with a more refined appearance and better insulation properties.
5. What are composite windows and why are they popular?
Composite windows combine the benefits of multiple materials to provide exceptional strength, energy efficiency, and low maintenance. Both Andersen and Pella offer advanced composite options designed for long-term performance in all climates.
6. Do you install Andersen and Pella windows in Pittsburgh?
Yes, we specialize in installing Andersen® and Pella® windows, two of the most trusted and recognized brands in the industry, known for their quality craftsmanship, innovation, and energy efficiency.
7. Which window material is best for energy efficiency?
Fiberglass, Fibrex®, and composite windows offer some of the highest energy efficiency ratings, helping reduce drafts and lower heating and cooling costs—especially important in Pittsburgh’s changing seasons.
8. How do I choose between wood, fiberglass, and composite windows?
The best option depends on your goals:
- Wood – Best for traditional style and customization
- Fiberglass – Best for durability and strength
- Fibrex®/Composite – Best overall balance of performance, efficiency, and low maintenance
We help homeowners choose the right solution during a free consultation.
9. Are premium window materials worth the investment?
Yes, upgrading to wood, fiberglass, or composite windows from Andersen or Pella provides long-term value through energy savings, durability, and increased home resale value compared to lower-cost alternatives.
10. Why choose your company for Andersen and Pella window installation in Pittsburgh?
We are experienced professionals specializing in premium window installation, ensuring Andersen and Pella products are installed correctly for maximum performance, efficiency, and longevity—backed by decades of experience serving the Pittsburgh area.

