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    Home | Our Blog | Fiberglass Windows: A Comprehensive Guide to Pros, Cons, and Cost to Install

    Fiberglass Windows: A Comprehensive Guide to Pros, Cons, and Cost to Install

    Reviewed by Tomas Kalkys. President.
    Qualifications: More than 20 years of experience in residential and commercial exterior remodeling.
    Founding farther of Legacy Service.
    Written by LegacyUSA Team

    posted on Oct 24, 2022

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    Fiberglass Windows: Pros, Cons, and Cost to Install

    If it’s time to install or replace your windows, then you’re probably wondering which material to choose. Fiberglass is one of the most popular options out there, and it may be an excellent choice for your home. This article will cover the pros and cons of fiberglass windows, the cost to install them, and more.

    At Legacy Service, we install and replace roofing, siding, and more. If you’re looking to replace your fiberglass windows in Southampton, PA, or any of the surrounding areas, look no further. We serve homeowners throughout New Jersey, Delaware, and southeastern Pennsylvania.

    If you’re looking for fiberglass windows near me, call us at 215-798-9790 to get started or continue reading to learn more.

    What is a Fiberglass Window?

    Fiberglass is one of the most commonly used materials to frame windows. Its popularity among homeowners stems from the fact that it’s durable, waterproof, and affordable.

    In appearance, they mimic the look of wood windows. They have plenty of options for color and style since they can be painted. However, this means that they may fade and peel over time and may require maintenance. On the other hand, vinyl windows tend to be plainer overall, but they require little to no maintenance.

    If you’re looking for fiberglass windows near me, then you’ve come to the right place. We provide window installation and replacement services to homeowners throughout southeastern PA, NJ, and DE.

    Best Fiberglass Windows Brands

    Along with vinyl and aluminum, fiberglass is one of the leading window installation materials among homeowners. For this reason, many of the top window brands offer fiberglass window options for installation and replacement. Some of these brands include Andersen, Marvin, Pella, and more.


    Andersen is known for being made with top-quality materials. It offers 35 different window types with multiple wood frame types, shapes, color options, and operational styles.


    Marvin offers a good range of windows, from double-hung and casement to skylights. It’s known for having high thermal efficiency and some of the strongest fiberglass in the industry.


    Pella is known for its strong fiberglass windows. Their window options are also quite energy-efficient and visually pleasing.

    Advantages of Fiberglass Windows

    Advantages of Fiberglass Windows

    Fiberglass windows reviews will tell you that this material offers plenty of benefits, which we discuss below. Knowing the advantages will help you determine whether they would be a good match for your home, depending on your tastes and preferences. Let’s take a look at some of our favorite advantages:

    Fiberglass is strong and durable

    The reason why this product is so strong is due to how it’s made. During the process, a weft inserter weaves and knits glass fibers into a resin injector. The strategic placement of the glass fibers ensures maximum strength. This new material is several times stronger than wood or vinyl. These window frames resist the scratches, dents, and corrosion you may see in other materials.

    Fiberglass windows are energy-efficient

    Homeowners have become increasingly interested in energy-efficient fiberglass windows over the years for various reasons. Since glass is an insulator, this material is manufactured to withstand extreme cold and heat. It also won’t expand or contract due to its stable and rigid frames. Energy-efficient windows help maintain the comfort of your home throughout the year.

    Fiberglass frames are low-maintenance

    Their strength and durability make them easy to maintain throughout their lifespan. Not only are they difficult to damage during harsh weather, but they’re also resistant to rusting, cracking, and warping over time. Pella products will not even need to be repainted because of their durable powder-coat factory finish.

    Disadvantages of Fiberglass Windows

    If you’re wondering, “What are the disadvantages of fiberglass windows?”, then continue reading.

    While this material offers plenty of benefits, there are still a few drawbacks to be aware of. Before you make any decisions, consider the disadvantages of fiberglass windows. Let’s take a look at the cons:

    Fiberglass windows cost more than vinyl windows

    One of the problems with fiberglass windows includes the cost. This material is typically more expensive than other popular materials like vinyl. However, fiberglass is designed to be more durable and long-lasting than vinyl. In 2022, homeowners can expect to pay anywhere between $8,700 and $11,000 to install 10 48-inch windows.

    You’ll have fewer color options than with wood windows

    On the other hand, fiberglass window’s cost is usually less expensive than wood, but you’ll have fewer color options. If you’re looking for an exact color match to your home’s design, wood will provide more flexibility. However, fiberglass still offers a variety of options to help you find a complementary color scheme.

    How Much Do They Cost?

    Now let’s get into the cost of fiberglass windows. While the cost will differ from homeowner to homeowner depending on their house, the area they live in, and the contractor they choose, we can still discuss the average cost.

    So, how much do fiberglass windows cost?

    In 2022, homeowners can expect to pay about $340 to $720 per window, and the national average is about $530 per window. This includes both labor and materials. Keep in mind, though, that the cost can increase for higher-end styles.

    Fiberglass typically costs more than vinyl, but they’re also known to be more durable and long-lasting.

    The average cost of materials

    On average, fiberglass lasts longer than vinyl due to the materials they’re made from. For this reason, they tend to be more expensive. However, many homeowners will say that it’s worth it. In many cases, this product has been known to last for up to 50 years.

    The average cost of labor

    Labor adds only a little extra to the overall cost of installation (about 6-7%), and most people will agree that it’s well worth it. Having a professional install your windows will ensure that the project is done correctly, on time, and remains within your budget. Many contractors will also be able to offer some of the best warranties.

    Cost of accessories/tools

    If you decide to install them yourself, then you’ll need to take the cost of accessories and tools into account. Tools needed include safety glasses, utility knife, putty knife, screwdriver, power drill, caulk gun, small pry bar, tape measure, hammer, level, and waterproof shims.

    DIY or Hire a Pro?

    DIY or Hire a Pro?

    Should you do the installation yourself or hire a pro? That depends on your experience level and how comfortable you are with doing it yourself. You should also know that while some manufacturers will sell directly to homeowners, others will only sell through approved installers.

    Hiring a team of professionals is recommended to maximize the lifespan of your windows by ensuring they’re installed correctly the first time. If you’re interested in finding the best fiberglass replacement windows for your home, contact us at any time! We’ve been providing window replacement in southeastern PA, NJ, and DE for nearly two decades.

    How Long Do They Last?

    We often get asked, “How long do fiberglass windows last?” Fiberglass may be more expensive than vinyl, but it’s also known to last longer. In fact, it’s considered to be one of the most durable window frame materials on the market today, and it has the ability to last up to 80 years!

    These windows can effectively resist weathering, and the frames don’t have to be thick to be strong and stable. They’re also resistant to heat because the glass panes and window frames expand and contract with heat at a similar rate. All of this contributes to their lifespan.

    What Kind of Care Do They Need?

    While they are considered low maintenance, they will require some care over the years. The good news is that it’s not much!

    So, what types of maintenance do these windows need?

    • Clean the glass regularly, like you would with any other type of window.
    • Replace the weather stripping about every decade, or as needed.
    • Touch up with paint with 100 percent acrylic paint as needed, since they may fade or peel over time.

    Fortunately, they do not expand or contract, so they will sit tighter in the frame and not leak.

    This brings us to how they’re made.

    How They’re Made

    What makes fiberglass windows so durable?

    Along with being a strong, durable material in general, how they’re made is a major reason. Let’s take a look at the manufacturing process:

    An automated process called pultrusion fabricates most parts of a fiberglass window. During the process, lengths of fiberglass roving and strand mat are bathed in a resin and then heated in a die to harden the resin. A smooth, rigid lineal is what emerges from the die, and then it’s typically cut to length, coated, and fitted with corner blocks that are reinforced by nylon.

    If you’re interested in installing the best fiberglass windows on your home, please contact us today to schedule a free appointment.

    Are Fiberglass Windows Right for You?

    Are Fiberglass Windows Right for You?

    Before you make any decisions, conduct research and consult with professionals to find out if these windows are right for you. Here are several factors to consider:

    Consider the appearance of fiberglass windows

    Some homeowners prefer wooden windows simply for their appearance, which provide homes with a traditional charm. While fiberglass may not offer that same charm, people can install interior wood trim on top of the frames.

    Consider their price

    In most cases, fiberglass will cost more than vinyl. This is due to its strength and durability. Most fiberglass owners will agree that the durability and long lifespan are worth it.

    Pick Your Style

    Once you decide to install, you’ll want to pick a style. A variety of choices is available, including wide open, bathing beauty, wall of glass, seeing green, historic look, and throw a curve. Read our descriptions to see which one (or multiple) you’d be interested in.

    Wide Open

    Along with being structurally sound, these windows are also known as beautiful and versatile. Frames and sashes made of fiberglass can be quite narrow, and the sashes can’t even warp.

    Bathing Beauty

    It can be tough finding the right windows for a bathroom. Fortunately, you won’t have to worry about that with this product since most of the windows are manufactured to be immune to humid air and moisture that can often be found in bathroom environments.

    Wall of Glass

    Large windows offer stunning views, but keep in mind that they will also need to be resistant to harsh winds. Fiberglass windows provide peace of mind because certain types can resist winds up to 140 mph and others can resist winds up to 190 mph!

    Seeing Green

    While dark colors have become increasingly popular over the years, it’s important to note that these colors are especially prone to fading. The good news is that with the powder-coat finish on certain styles, you can rest assured that they’re virtually immune to fading from UV rays.

    Historic Look

    Certain styles of fiberglass windows are ideal for historic homes. Not only are they long-lasting and durable, but they can also be designed to match their surroundings. For example, a homeowner could install interior wood trim on top of the fiberglass frames, which helps combine strength and appearance.

    Throw a Curve

    Bow windows are popular due to their ability to add space to a room while funneling in natural light. Not only that, but these windows also help increase a home’s curb appeal and value for those who are looking to sell their home at some point.

    Frequently Asked Questions about Fiberglass Windows

    Frequently Asked Questions about Fiberglass Windows

    If you’ve read the best fiberglass window reviews and you’re interested in installing them in your home, then you may have some questions before you commit. In this section, we answer some of the questions that we’re most frequently asked about fiberglass windows. If you’d like to speak with an expert, get in touch with our team to schedule a free appointment.

    Are fiberglass windows worth it?

    Fiberglass windows are typically more expensive than other types of popular window materials like vinyl, but they’re also designed to be more durable and longer-lasting. They’re also fairly versatile in appearance since their frames can be fitted with wood trim to look more like a wooden frame.

    In most cases, fiberglass windows are worth the cost, especially if you’re looking for frames you won’t have to replace for decades to come. They also require little to no maintenance because they’re resistant to warping, bending, peeling, and cracking.

    How long do fiberglass windows last?

    Fiberglass windows are designed to last for up to 50 years or more. Their frames are reinforced with strong glass fibers to enhance their durability and add considerable strength to the product. For this reason, they’re known as one of the longest-lasting window materials on the market.

    Why are fiberglass windows harder to install?

    Fiberglass windows are more rigid than other material types, causing them to be challenging to install. Precision is required, so homeowners are not usually recommended to complete this task themselves unless they have plenty of experience. Hire a team of professionals to ensure the installation process is done right and maximize the durability and lifespan of the windows.

    What style of window is the most energy efficient?

    Wood and fiberglass are two of the most energy-efficient materials for windows since they’re made to withstand extreme cold and heat. Fiberglass is already an excellent insulator, and it can also be filled with foam to create even higher insulation levels. Fiberglass frames also take less energy to manufacture than vinyl, aluminum, or wood frames.

    What are the best fiberglass windows?

    Some of the best fiberglass window lines include Andersen, Marvin, and Pella. We’ve provided a brief description of each brand in this article’s aforementioned section called Best Fiberglass Window Brands. Comfort Line fiberglass windows are also one of the leading types among homeowners throughout the United States.

    What are the disadvantages of fiberglass windows?

    While they offer plenty of advantages, there are also a few disadvantages to consider before you make any decisions. The leading complaints we receive about them include:

    • They can be more expensive than other materials.
    • They’re more challenging to install and not as readily available as other types.
    • They may fade in the sunlight over time and will need to be repainted occasionally.

    Are fiberglass windows good in cold weather?

    Yes, this product is manufactured to withstand extreme heat and cold. Not only do they provide excellent insulation, but the frames are also stable and rigid, so they won’t expand and contract due to fluctuations in temperature. When these windows are combined with double- or triple-panes, they help increase your home’s energy efficiency as well as your savings.

    How do you clean fiberglass windows?

    These windows don’t require much care other than cleaning them regularly and repainting them as needed. You can clean fiberglass windows like you would any other window: with basic soap and water. Windex and similar products can also be used. Just remember that it’s best to use a soft cloth to wipe the glass and avoid using abrasive cleaners that can cause scratches.

    Get Started on Your Project!

    If you’re interested in replacing your windows, visit or contact us at 215-798-9790 to schedule a free estimate. We also offer roofing, siding, and door replacement to homeowners in southeastern PA, NJ, and DE.

    Posted on Oct 24, 2022 in Roof

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