free window estimate


denver windows doors siding

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.  Your new Infinity windows will virtually eliminate damaging ultraviolet and infrared rays damage. No more faded floors or furniture. 

Infinity Fiberglass windows are 800% stonger than vinyl windows and 300% stonger than composite windows.

Infinity Fiberglass Windows from Marvin has an extremely low thermal expansion rate resist the ravages of cold, heat, time and pressure to provide the most worry-free windows and doors available today.

denver fiberglass windows

Tired of windows that are difficult to operate?

The low expansion of Ultrex Fiberglass means Infinity from Gravina's 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?

Are you sick of high-maintenance windows?

The low expansion of Ultrex Fiberglass means Infinity’s patented finish stays looking like new and maintenance free.  Our windows resist discoloring, warping, rotting, corrosion, denting, rust and doesn’t require sanding, scraping, or painting.  Other windows or doors may require maintenence.

 window installation, window warranty

Window Durability - Built for a lifetime

Infinity from Marvin Fiberglass windows are so well designed, energy efficient and durable you will never have to worry about your windows again!


At Gravina's Window Center of Littleton, w e 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! We are the EXPERTS in replacement windows and doors.  


  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.


Ask a question, or schedule a free, highly informative in-home consult. *We never share your information. Read our privacy policy.

Please enter your name

Please enter your phone number

Please enter your email address

Please enter a message

How Did You Find Us?
Invalid Input

Please check the box to verify you are not a robot


  • 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
  • 1

infinity replacement windows



james hardie siding fiber cement

marvin windows and doors 



ProVia door replacement denver

ThermaTru doors



Simonton windows