Fiberglass Replacement Windows and Doors


Gravina's Window Center of Littleton is a window replacement company headquartered in Littleton and serving the Denver Metro Area. We always offer a free estimate on new windows and doors. As an A+ Better Business Bureau Rated Company, family owned and operated window dealer, we constantly strive for excellence with outstanding installation in Infnity fiberglass window and door replacements.

Infinity from Marvin Replacement Windows

With energy costs getting higher, it may be necessary now, more than ever, to invest in replacement windows.  Inefficient and drafty windows and doors affect your home in many different ways. But don't worry! We have the window solution for you.




If you’re in the Denver Metro area and need replacement windows, we can help. From replacing full frame windows to insert window installation, Gravina’s Window Center of Littleton has you covered.  We offer the best fiberglass windows on the market, Infinity from Marvin - Made from Ultrex fiberglass.  With professional installation and a lifetime workmanship warranty, we do window replacement the right way.

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Infinity from Marvin Replacement Windows and Doors

Over the years, we have found that when homeowners insist on replacing with vinyl windows, they are just putting a bandaid on their problem — an expensive one at that. Vinyl windows expand and contract under Colorado weather conditions — making vinyl windows challenging to open and close.  This warping and shifting affect their performance and durability.  Time and time again we see people needing to replace their windows again.  If they had only replacement them with something stronger.  Infinity created Ultrex fiberglass with one goal in mind: develop the most durable window material in the industry.  It’s not only eight times stronger than vinyl — it resists expanding and contracting in any weather. So you get a secure, snug fit that will endure. When customers choose Infinity from Marvin replacement windows, they know they will never have to worry about how they perform. Infinity from Marvin windows with Low-E Glass and Argon meet Energy Star requirements. Backed by Marvin Windows, homeowners are getting windows that are "Built for Life!" Infinity fiberglass windows are the most durable fiberglass replacement window on the market.  

If you're starting to think about replacing your windows or are in the planning stages of your project, we can help you explore your options, answer any questions, or create a quote. It is the perfect window for your home. Replace your windows with Infinity from Marvin and breathe easy.

A family tradition since 1973.

Gravina's Window Center of Littleton is a Family Owned and Operated Window Replacement Company, Built on Family Values Since 1973

Infinity from Marvin Windows Dealer | Window Replacement

From patio doors to window replacement, choosing the best fiberglass windows is a no brainer.  Our Infinity fiberglass replacement windows and Infinity patio doors are designed to fit your project plans perfectly. You can count on each fiberglass window replacement to be durable, energy-efficient and secure.  Available in a variety of sizes and shapes. As Infinity's oldest replacement window company in the country, Gravina’s Window Center of Littleton offers the full line of Infinity from Marvin replacement windows. Made of Ultrex® fiberglass, Marvin’s patented pultruded fiberglass, Infinity windows combine the best strength, comfort and energy savings on your utility bills for Denver homeowners.



Infinity Windows Brochure


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Partners with Infinity from Marvin Windows and Doors

The value of any Infinity from Marvin® window or door goes far beyond the quality of its materials and construction. Infinity windows and doors are built to last, long into the future.  There’s a reason you won’t find Infinity from Marvin windows and doors in the big box stores. It’s only through independent window installers like us that can offer an unparalleled level of support and expertise. Choosing and installing replacement windows properly involves a lot more than people can imagine. We work only with homeowners to find the best solution to make beautify your home and improve it's curb appeal.

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Don't forget to ask about our current offers and special financing options for replacement windows and doors!

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