Pella Platinum Certified Contractor Fiberglass Windows

Fiberglass Windows

Fiberglass windows are a favorite of Madison-area homeowners, and with good reason. To begin with, they are simply gorgeous to behold. 

In addition to their aesthetic appeal, fiberglass windows have many other benefits including the fact that they provide a wider view of the outdoors, as they have a slimmer profile than wood or vinyl windows. They’re also waterproof, unaffected by temperature, and offer about eight times the strength of vinyl — making them extra durable. Fiberglass windows are also very low maintenance, highly energy efficient, and offer the surprising benefit of sound insulation.

Since Legacy Exteriors is a fully certified and licensed window contractor in Madison, WI, we have the benefit of working with only the very best fiberglass window companies like Pella, Anderson, and Marvin. This means homeowners that hire us enjoy top-notch products that are backed with exceptional warranties — which we’re happy to share with you anytime.

The following is an overview of the fiberglass window brands we install. Each brand has a wide array of options to choose from, so please let us know if you’re looking for more information or guidance. We’d be happy to stop by your home to learn exactly what you’re looking for and answer any questions you have.


These maintenance-free fiberglass windows will never rot or corrode. They’re naturally resistant to water and bugs, and also resist chipping, chalking and fading. These are the windows the owners of Legacy Exteriors have in their home — and they simply love them.

In addition, we are a Pella Platinum Certified Contractor, which means we receive and adhere to all required education regarding proper window installation and industry best practices consistent with Pella products. We also maintain specific insurance to work as a Pella Certified Preferred Contractor. This all adds up to proficient window installation, and peace of mind for the homeowner who knows the window contractor installing their new windows is educated, experienced and insured.

Let’s take a look at the Pella® Impervia® line …


Pella’s fiberglass windows are made of a proprietary fiberglass that is the strongest material for windows, making them extremely durable, as well as maintenance free. They’re engineered to be as tough as they are beautiful.

Additional benefits of Pella Impervia Fiberglass Windows:

Pella Platinum Certified Contractor Windows Madison WI
  1. Dent, Bend & Break Resistant
    Pella’s fiberglass windows are crafted to resist denting, bending and breaking better than the competition. Since it’s a thermoset material, it does not melt or break down when exposed to UV rays, extreme heat, or sub-zero cold — a great benefit when dealing with Wisconsin winters.
  2. Baked On, Heavy-Duty, Powder-Coat Finish
    Pella’s powder-coat finish is one of the reasons these Impervia windows are so durable. The baked-on finish is factory-applied, and has a reputation for resisting chipping, chalking and fading. This is even true with dark colors. The long-lasting powder-coat finish meets AAMA 624, a highly-rated fiberglass coating, which makes painting and refinishing your windows a thing of the past.
  3. Sleek, Timeless Style
    Versatile design, plus streamlined profiles and clean lines add up to timeless style. Paired with an up-to-date color palette (including black), revolutionary hardware — and details like grilles-between-the-glass — Pella fiberglass windows make it possible to see your design vision come to life.
  4. Outstanding Performance
    Pella Impervia products are made to perform at commercial building standards, making them a long-lasting addition to your residential home. Pella’s fiberglass windows are suitable for all climates.
  5. Exceptional Energy-Efficiency
    Energy-efficient dual- and triple-pane glass options are made with argon, which slows the transfer of heat. This not only saves you money on your utility bill, it also helps keep your home comfortable all year long.


More than a quarter of a century ago, Marvin’s innovative team introduced Ultrex® Fiberglass for use with windows and doors. Since then, they’ve taken what we’ve learned from Ultrex and applied it to their latest fiberglass type, High-Density Fiberglass, which is even stronger. Both types of Marvin fiberglass provide outstanding durability, energy efficiency and strength. 

Ultrex Fiberglass is used for the exteriors of Marvin’s Elevate products and the interiors and exteriors of Essential products. High-density Fiberglass is used for the exteriors of Modern products, and mimics the clean look, feel and strength of aluminum and steel with better insulating qualities.

Additional benefits of Marvin Fiberglass Windows:

  • Strong enough to endure the roughest of Wisconsin winters with minimal wear and tear over time
  • Virtually maintenance free, no painting or refinishing unnecessary 
  • Outstanding structural strength ensures windows open and close easily for years to come
  • Marvin’s fiberglass does not expand or contract with dramatic changes in temperature, and this makes their fiberglass products resistant to leaks, seal failures and stress cracks
  • When combined with energy-efficient glass options, Ultrex and High-Density fiberglass windows do an even better job of keeping the indoors comfortable no matter that the temperature outside

Here’s a brief overview of the three different collections of fiberglass windows Marvin offers …

The Marvin Elevate® Collection

Remarkable design and outstanding strength come together to bring balance to your aesthetic and performance needs. Ultrex Fiberglass window exteriors stand up to the elements, outperforming and outlasting roll-form aluminum, vinyl and other composites. The interior of Marvin’s windows are made of natural wood — combining the timeless beauty of real wood with resilient fiberglass.

Martin Elevate Fiberglass Windows Contractor Madison WI

The Marvin Essential™ Collection

With the Essential Collection, design, quality, and performance come together in one amazing offering. This collection of fiberglass windows is made with durable Ultrex Fiberglass exteriors and interiors that are beautiful and maintenance free. Enjoy clean, versatile design coupled with the strength of fiberglass — inside and out — that will stand the test of time.

Marvin Essential Fiberglass Replacement Windows Madison WI

Marvin Signature® Collection — Modern

These windows are crafted with Marvin’s High-density Fiberglass exterior, and low-gloss aluminum interior, for a truly stunning modern look. The idea behind this collection was to create a product line that “meets the exacting principles and standards of true modern architecture.” And Marvin delivers this by integrating exceptional design, performance, and customer experience in one beautiful collection that includes thermal performance, narrow sightlines — and a modular system — for a seamless modern aesthetic.

Marvin Modern Fiberglass Replacement Windows Madison WI


Protection and durability are always top-of-mind with Anderson. And this philosophy shines through in their fiberglass windows line. As with the other window brands we install, Anderson fiberglass windows are durable, weather-resistant, energy-efficient and virtually maintenance free. Crafted with fiberglass on the outside for superior protection against the cold, heat and the elements, these windows are made with natural wood interiors.

The Anderson line of fiberglass windows is called the A-Series. Here’s an overview of options …


The weather-resistant design makes this Anderson’s best-performing awning

  • Available in an array of style options, including factory-finished wood interiors for architectural authenticity
  • Anderson’s triple-pane glass option provides outstanding energy efficiency
AW15 13095.tif


  • Weather-resistant design makes this Anderson’s best-performing casement
  • As with Anderson’s awning windows, these casement windows also offer a large array of style options — including factory-finished wood interiors for architectural authenticity
  • Triple-pane glass (optional) provides exceptional energy efficiency
AW13 11938.tif


  • Anderson’s  best-performing double-hung for its weather-resistance
  • Crafted of wood, and protected by fiberglass and Fibrex® composite material
  • Wood interiors can be stained or painted for architectural authenticity
Anderson Double-Hung Replacement Windows Madison WI


  • Weather resistant, it’s Anderson’s  best performing picture window
  • Wood protected by fiberglass
  • Beautiful wood options for architectural authenticity
Anderson Picture Replacement Windows Madison WI

Interested in learning more or scheduling a complimentary consultation?

Feel free to contact Legacy Exteriors anytime. We’re a local, licensed window contractor with decades of experience working with Madison area homeowners.