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Everything About Fiberglass Windows & Top Brands

Posted on May 30, 2024

Estimated Reading Time : 6 Min.

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Fiberglass Windows

Fiberglass windows have been gaining popularity in recent years, and for good reason. These innovative window solutions offer a unique blend of durability, energy efficiency, and aesthetic appeal, making them an attractive choice for homeowners and builders alike. In this comprehensive guide, we’ll explore fiberglass windows, addressing their benefits, drawbacks, installation process, and the top brands dominating the market. So, whether you’re considering a fiberglass window replacement for your home or simply curious about this cutting-edge window material, read this blog post through the end. 

What Are Fiberglass Windows?

At their core, fiberglass windows are constructed from a composite material made of glass fibers reinforced by a plastic resin matrix. This unique composition sets them apart from traditional window materials like vinyl, wood, or aluminum, offering a distinct set of advantages.

Compared to vinyl windows, fiberglass windows are more durable, energy-efficient, and resistant to temperature fluctuations. Unlike wood windows, they are impervious to rotting, warping, or insect infestations. And while aluminum windows may be strong, fiberglass windows provide superior insulation properties, reducing energy costs.

Benefits of Fiberglass Windows

1. Durability

One of the most significant advantages of fiberglass windows is their exceptional durability. Unlike vinyl windows, which can warp or discolor over time, or wood windows, which are susceptible to rotting and insect damage, fiberglass windows are designed to withstand the harshest conditions.

2. Superior Energy Efficiency

With energy costs constantly on the rise, the insulation properties of fiberglass windows can be a game-changer. Thanks to their non-conductive nature, fiberglass windows do an excellent job of minimizing heat transfer, keeping your home warmer in winter and cooler in summer. This translates to lower heating and cooling costs.

3. Design Flexibility

When it comes to aesthetic appeal, fiberglass windows are true chameleons. Available in a wide range of styles, colors, and finishes, they can seamlessly blend into any architectural design, from traditional to contemporary. Whether you’re aiming for a cozy, rustic vibe or a sleek, modern look, there’s a fiberglass window option that will perfectly complement your home’s aesthetic.

4. Environmental Impact

In an era where sustainability is increasingly important, fiberglass windows offer an eco-friendly solution. Not only are they incredibly durable and long-lasting (reducing the need for frequent replacements), but they’re also highly energy-efficient. And when the time does come for replacement, fiberglass windows are generally recyclable, minimizing their environmental impact.

Disadvantages of Fiberglass Windows

While fiberglass windows offer a plethora of benefits, it’s important to acknowledge their potential drawbacks as well:

Higher Initial Cost

Compared to vinyl or aluminum windows, fiberglass windows tend to have a higher upfront cost. However, their long-term durability and energy savings often make up for this initial investment.

Limited Color Options

While fiberglass windows are available in a variety of colors and finishes, the options may be more limited than those of vinyl or wood windows.

Professional Installation Requirement

Due to their unique composition and installation requirements, fiberglass windows typically necessitate professional installation, which can add to the overall cost.

Also Read: 10 Types Of Windows For Your Home

Top Brands that Offer Fiberglass Windows

Now, let’s take a closer look at some of the top brands dominating the fiberglass window market:

1. Marvin

Marvin fiberglass windows

Marvin is a name synonymous with quality and innovation in the window industry. Their fiberglass window offerings, such as the Ultrex® fiberglass line, are known for their exceptional durability, energy efficiency, and sleek designs. Marvin fiberglass windows are available in a wide range of styles, from traditional to contemporary, and can be customized to suit your specific needs.


  • Industry-leading quality and craftsmanship
  • Exceptional energy efficiency
  • Wide range of customization options


  • Premium pricing
  • Limited color options compared to some competitors

2. Pella

Pella window

Pella is another industry leader in the world of fiberglass windows. Their Pella Impervia® line is renowned for its strength and resilience, capable of withstanding even the harshest weather conditions. Pella fiberglass windows boast excellent insulation properties, contributing to significant energy savings.


  • Impressive durability and weather resistance
  • Superior energy efficiency
  • Extensive warranty coverage


  • Limited style and color options
  • Higher price point

3. Anderson Windows & Doors

Anderson windows & doors

Andersen is a household name in the window industry, and their fiberglass windows showcase their dedication to quality products. The Andersen A-Series is their line of fiberglass windows, combining the strength and durability of fiberglass with attractive designs and color options.


  • Wide range of styles and color choices
  • Excellent value for money
  • Strong brand reputation


  • Some reports of quality control issues
  • More expensive than other options

Fiberglass Windows vs. Vinyl Windows 

When comparing vinyl vs. fiberglass windows, the main difference lies in the core material composition and the resulting performance characteristics. Vinyl is a plastic-based material, while fiberglass is a composite material that combines the strength of glass fibers with the flexibility of polymer resins. Fiberglass windows offer superior insulation, durability, and resistance to environmental factors, but they come at a higher cost and require more complex installation. Vinyl windows are more cost-effective and easier to install but may not match the long-term performance and durability of fiberglass windows.

Fiberglass Windows vs. Aluminum Windows

The main difference between fiberglass and aluminum windows is their material composition, insulation properties, and maintenance requirements. Fiberglass windows offer superior insulation and energy efficiency, making them a more environmentally friendly and cost-effective choice in the long run. However, aluminum windows are lighter, more affordable upfront, and easier to install, making them a popular choice for certain applications.

Additionally, fiberglass windows are more resistant to environmental factors like UV exposure and temperature changes, while aluminum windows require regular maintenance to prevent corrosion and maintain their appearance. Fiberglass windows are also more expensive upfront due to their composite material and complex installation process.

How Much Do Fiberglass Windows Cost?

To give you a very general idea, most homeowners can expect to pay between $500 and $1,000 per standard fiberglass window (including installation) for a mid-range product and relatively straightforward installation. But, your specific costs could be higher or lower based on your specific project requirements.

Factors that Influence Fiberglass Window Costs

Let’s get to the heart of the matter: How much can you expect to pay for fiberglass windows? The cost of fiberglass window replacement can vary significantly based on several key factors:

1. Window Size and Style: Larger windows and more intricate styles (like bay or bow windows) will inherently cost more than simple double-hung or casement windows. Multi-pane windows also tend to be pricier.

2. Energy-Efficient Features: If you want to maximize energy savings with triple-pane glass, low-E coatings, or other high-performance features, you’ll pay a premium. However, these upgrades can offset the higher upfront cost over time through lower utility bills.

3. Brand and Quality: Like most products, you’ll find the cost of fiberglass windows varies based on the manufacturer’s reputation and overall quality. Top-tier brands usually cost more than budget options.

4. Installation Complexity: Replacing windows in a simple ranch home will be much more affordable than a multi-story house with complex architectural details. Difficult access or the need for scaffolding can also drive up labor costs.

5. Your Geographic Location: Window prices and labor rates for installation tend to be higher in areas with a higher cost of living, like major cities or coastal regions.

Final Thoughts

Fiberglass windows offer a compelling combination of durability, energy efficiency, low maintenance, and aesthetic appeal, making them an attractive choice for modern homeowners. While the initial investment may be higher, their long-term benefits often outweigh the cost. By understanding the unique advantages of fiberglass windows and the top brands on the market, you’re one step closer to making an informed decision that will enhance the beauty, comfort, and energy efficiency of your home for years to come.

Contact The Expert Window Installers In Tulsa, OK

Are you looking to install fiberglass windows in your home or commercial space? Contact the home renovation specialists and expert window installers at A. Fricker Roofing and Waterproofing in Tulsa, OK. Contact us at (918) 402-7167 and start your home renovation project today. 

Fiberglass Windows