Fiberglass Windows

Why Choose Fiberglass Windows?

When it comes to selecting windows for your Chicago or Madison home, durability, energy efficiency, and aesthetic appeal are the three main factors that should influence your decision. Fiberglass windows excel in all these areas, making them an increasingly popular choice among homeowners and contractors alike. At NEXT Door & Window, we’re proud to offer top-quality fiberglass windows that combine strength with beauty and performance.

Fiberglass windows are engineered to withstand the harshest elements while maintaining their structural integrity for years. Made from glass fibers and resin, fiberglass windows offer superior strength-to-weight ratio, minimal expansion and contraction, and excellent insulation properties. Whether you’re building a new home or replacing your existing windows, fiberglass provides a range of benefits, making it a smart investment for any property.

Some key advantages of a fiberglass window replacement include:

Exceptional durability and strength
Superior energy efficiency
Minimal maintenance requirements
Unobstructed views
Sleek, modern appearance

Check Out Our Recent Fiberglass Window Installations

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Fiberglass Window Product Lines

NEXT Door & Window is proud to partner with Marvin Windows, giving homeowners across the Midwest access to Infinity from Marvin fiberglass windows. Constructed with Ultrex fiberglass, Infinity from Marvin windows are developed to be 8 times stronger than vinyl and easier to maintain than wood while resisting warping in harsh weather conditions.. They feature a fade-resistant acrylic finish that’s thicker than most manufacturers’, making them resistant to chipping, peeling, and denting.

Marvin Windows (available in Chicago)

Durable hardware for easy opening and closure for the life of the window
Single-sash hinge designs
Easy Wash mode

Infinity from Marvin

Clear View hinge option for maximum visibility
Ultrex® Fiberglass construction that outperforms wood and vinyl
Energy Star rated for optimal insulation and performance

Marvin Elevate (available in Chicago)

Available with standard folding handle or dual arm rotary hardware for easier cleaning
Warm wood interiors and stylish, fiberglass exterior color options offer customizable design configurations
Multi-point locking system for tight seals and protective security

Get Bigger Views With Fiberglass Windows

Because Ultrex fiberglass is so strong, Infinity window frames can be built with narrower frames. This means less material for unobstructed views. Enjoy the scenery from your home with Ultrex fiberglass windows manufactured by Infinity from Marvin.

Fiberglass Material Strength

At 8x the strength of vinyl, Ultrex is the strongest window framing material on the fiberglass window replacement market. Unlike vinyl, which can warp and shift under certain conditions, Ultrex is resistant to expanding and contracting in any climate. Furthermore, Ultrex fiberglass captures the nuanced aesthetic of wood without its required maintenance and care. This means Ultrex fiberglass windows are easy to clean without sacrificing style.

Fiberglass Energy Efficiency

While vinyl expands at a higher rate than glass, Ultrex expands at a slightly lower rate than glass. This means Infinity windows are resistant to leaks, seal failures, and stress cracks that can compromise energy efficiency and overall performance.

We submit Infinity windows and doors for independent testing and verification to achieve energy certification and labeling in programs administered by the National Fenestration Rating Council (NFRC) and ENERGY STAR®. Use the NFRC label or speak with one of our window replacement experts to compare energy performance factors across products and brands.

match your home’s décor. Choose from round-top, French casement, push-out, or in-swing designs that can be customized to meet precise size and shape requirements.

Get Started by Talking to an Expert

Want to enjoy new fiberglass windows in your home today? At NEXT Door & Window, we’ve built up a team of experienced window replacement specialists throughout the Chicagoland and Madison areas who are ready to guide you through every step of the process. Our experts are here to provide personalized advice, answer your questions, take measurements, prepare accurate quotes, and help you place your order. They’ll also assist in coordinating the installation process to ensure a smooth and hassle-free experience.

NEXT Door & Window is well-versed in fiberglass window installation. Our technicians regularly undergo training to stay updated on the latest innovations and technologies in the industry. From evaluating your current windows to helping you select the perfect NEXT fiberglass windows and overseeing proper installation, our certified experts are committed to your satisfaction.

See What Your Neighbors Are Saying

Next Door and Window

4.8

Based on 166 reviews

review us on

Carolyn Bennick

17:48 19 Feb 23

Next Door and Window is definitely a 5 STAR business. Everyone at the office was extremely friendly and very helpful. Ron came out to the house in just a day or two and thoroughly explained and showed pictures of everything we needed to know about doors and storm doors, Next Door and Window also had a top-notch crew install our beautiful doors. I would highly recommend Next Door and Window!

Melissa Keating

14:26 14 Jan 23

We had two exterior doors and two storm doors installed. I am so happy with our experience with Next. They had excellent customer service from start to finish. The man who came to give us our quote did a thorough job measuring and talking to us about our options. The doors arrived sooner than expected which was a very pleasant surprise. Although it was expensive, I think it is worth it. The only negative is they told us both sets of doors would be installed on the same day with two crews, but unfortunately they sent only one man who had to come two days in a row and worked long hours to get the job done. He also moved our door stopper which left a large hole in our drywall, but didn’t tell us about the damage so now I need to figure out how to fix it.

Wendy Champion

17:00 29 Sep 22

Next Door and Window replaced an old, rotted exterior door. From the initial sales visit and estimate through installation, they were very prompt and professional. They kept me updated as to the expected installation date and the installation was done quickly and very cleanly. I am 100% satisfied with them and would highly recommend them.

Ralph Meeker

16:36 21 Jul 22

We are very pleased with our Marvin replacement windows from Next Door and Window. The windows are very attractive, interior wood stained to match our existing woodwork and exterior fiberglass with aluminum used to trim out the brick mold. Project was completed on schedule without any problems, so minimally disruptive for us. The installers did an excellent job cleaning up both inside and outside. Highly recommended.

John Knoepfle

20:14 06 Jul 22

This is our second large project with Next Door and Window. Both projects turned out even better than we expected. We had Next replace all of our doors. They look beautiful and the better seal and outstanding insulation made a huge difference in keeping the house warm in winter and cooler in summer.Two weeks ago we had Next replace all of the windows. Again, the windows are gorgeous, the installation was flawless and looks beautiful inside and outside. It has definitely improved our curb appeal and the house just looks brighter and sunnier inside. In the current summer heat, we've also already noticed that house feels like its significantly cooler to the insulation and the windows themselves.Everyone we've worked with at Next has been wonderful. The installation teams were courteous and very professional. They also left our home spotless. When they finished the work you couldn't even tell they were there. The management team also cares--they checked with us multiple times to make sure everything was right.Next Door and Window is highly recommended! I've recommended them to my family, friends and neighbors.John

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Selections to Discuss with Your Expert

Our NEXT Door & Window experts are ready to guide you through the key decisions that will make your fiberglass window replacement project a success. Here are some important aspects to consider and discuss together:

Window Styles

Start by evaluating your current windows. Are you satisfied with their style and functionality, or are you looking for a change? Our experts can help you explore various window styles for your fiberglass replacement that complement your home’s architecture and meet your specific needs — from classic double-hung to sleek casement windows.

Fiberglass Options

Perhaps you’ve already chosen fiberglass for its superior qualities. There are still options to consider within this material category. Our experts can explain the specific benefits of our fiberglass offerings, including durability, energy efficiency, and aesthetic features that set them apart.

Divided Lites

Also known as grids or grilles, divided lites can add character and style to your windows. Our experts can show you a range of patterns — from traditional to contemporary — or help you design a custom look that’s uniquely yours.

Colors and Finishes

Fiberglass windows offer versatility in color options. Our experts can guide you through our curated selection of interior and exterior colors and finishes, ensuring your new windows perfectly complement your home’s style, both inside and out.

Energy Efficiency Features

Discuss the various energy-efficient options available, such as low-E glass coatings, gas fills, and multi-pane configurations, to maximize your home’s comfort and energy savings.

Hardware and Accessories

From locks and handles to screens, our experts can help you choose the right hardware and accessories to enhance both the functionality and appearance of your new fiberglass windows.

By discussing these key aspects with our NEXT Door & Window experts, you’ll be ready to make informed decisions. The result? Beautiful, efficient, and long-lasting fiberglass windows for your home.

Your neighbors trust us

Our satisfied customers say it best and keep coming back. Over 50% of our business comes from referrals and returning customers like you.

Gave us great suggestions on window replacements. We love the picture windows and other suggestions he made. He is very knowledgeable and came to our house during the installation to make sure all was going well and we were happy with the windows and installation.

Jessie R.

The installers were very skilled and knowledgeable. In my Family Room, the installer even took it upon himself to level the wood shelf under the window he was installing so the wood framing the window would be even and “look nice“ as he said. He didn’t have to put in that extra effort, but he did…he took great pride in his work.

Marianne P.

Next Door & Window worked within my schedule and timelines. They are very professional. And Scott the salesperson inspected the installers work to make sure they were doing what they were supposed to. I have nothing bad to say about them.

Larry H.

Very professional, I enjoyed visiting the showroom and being showed around the shop to see how they prepare the windows for installation, and of course meeting those who run the show!

Brett W.

FAQ's

Are fiberglass windows better than vinyl?

While both materials have their merits, fiberglass windows offer several advantages over vinyl. NEXT’s fiberglass windows are exceptionally strong, durable, and low maintenance. They resist warping, rotting, and corrosion better than vinyl. Fiberglass also has a lower expansion and contraction rate, which contributes to better energy efficiency and longevity. However, vinyl windows can be more budget-friendly initially. What you choose depends on your specific needs, long-term goals, and budget.

How long do fiberglass windows last?

Fiberglass windows are designed for exceptional longevity. While many factors can affect their lifespan, including climate and maintenance, properly installed fiberglass windows from NEXT Door & Window come with a Limited Lifetime Warranty, making them an excellent long-term investment for your home.

What is the most energy-efficient window?

Fiberglass windows excel in energy efficiency for several reasons. The material itself has natural insulating properties. Additionally, fiberglass has minimal thermal expansion and contraction, which helps maintain a tight seal and reduces the risk of air leakage.

Upgrade Your Home with New Fiberglass Windows from NEXT Door & Window

Fiberglass windows offer an unbeatable combination of strength, energy efficiency, and style. By choosing NEXT Door & Window for your fiberglass window installation, you’re making a long-term investment in your home’s value by upgrading its overall quality and durability. Our partnership with Marvin Windows ensures that you’ll receive the industry’s best products backed by expert installation and customer service.

Ready to experience the benefits of fiberglass windows in your home? Schedule your free consultation with a NEXT Door & Window expert today or stop in and see us at one of our showrooms. Our team is ready to guide you through the selection process, answer your questions, and provide a customized solution for your home.

Don’t wait to enhance your home’s comfort, efficiency, and curb appeal. The first step towards beautiful, long-lasting windows is just a click away!