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303-794-0490   SHOWROOM HOURS: Monday - Friday 8am - 5pm; Saturday 9am - 3pm  (After hours by appointment)

Replacement Windows | Patio Doors | Entry Doors | James Hardie Siding

You and your home deserve the best, and for windows and doors that last a lifetime, you want Gravina’s Window Center of Littleton. That's why Gravina’s carries brands we Infinity Windows from Marvin.

Infinity from Marvin Fiberglass Windows, Made From Ultrex

front of the home

Denver can be brutal on your home.  With our windows and door installations you can say goodbye to the hot summer days in your home and enjoy more comfort during the winter. 

Superior Materials

Infinity Fiberglass - 800% stonger than vinyl.  300% stonger than composite - Extremely low thermal expansion rate so windows and doors can withstand temperature extremes while mainting a tight seal in both hot and cold climates.

denver fiberglass windows

Easy To Operate

The low expansion of Ultrex Fiberglass means Infinity fiberglass replacement windows resist sticking, swelling, and warping, providing easy operation for the life of the window.  Colorado's brutal UV and infrared rays play havoc on lesser quality windows and door frames. Who wants to deal with windows that won't open or close very easily?

Low Maintenance

The patented acrylic finish and low expansion rate of Ultrex keep Infinity windows looking new and virtually maintenance free.

thick acrylic paint

Total Performance

Strong DP rating- Infinity windows are designed and tested to perform. The majority of Infinity products are tested and rated at light commercial grade performance levels which far exceed normal residential conditions, insuring the windows will withstand the elements and remain weathertight.


At Gravina's Window Center of Littleton, we use only the highest quality materials to provide professional window replacement, patio doors, entry doors and James Hardie siding. We ought to know, we have been doing windows in Colorado since 1973!


  What are you waiting for? Start your window replacement project today!

Simply fill out the contact form or call us at 303-794-0490 for your free no-obligation quote.


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  • Windows

    Replacement windows add value and beauty to your home, reduce costly maintenance, and save you money on your utility bills. Read More
  • Patio Doors

    Patio Doors need to withstand heavy use as well as our extreme weather conditions here in Colorado. Read More
  • Entry Doors

    Gravina's recommends fiberglass entry doors for long-lasting beauty and value with less maintenance. Read More
  • Siding

    Traditional and timeless. Sleek and strong. James Hardie is the most popular brand of siding in America Read More
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