Denver Replacement Windows

Denver homeowners, let Gravina's Window Center of Littleton® take the stress out of replacement windows with energy-efficient fiberglass windows and doors. Our Infinity replacement windows guard your home from Rocky Mountain weather while increasing its value - plus you'll save money on cooling costs year round! Investing in superior fiberglass windows will ensure comfort indoors all day long and give you peace of mind that's priceless. Don't go another season wondering if it's time to replace your existing windows or doors; trust Gravina's Window Center of Littleton® as your go to window company for worry-free results.


best Replacement Windows for your home


Infinity from Marvin

Gravina's Window Center of Littleton® is the oldest Authorized Infinity window replacement company in Colorado.  Headquartered in Littleton, CO, we serve the entire Denver Metro area and the majority of the Front Range. We offer free consultations on replacement windows, patio doors, entry doors, and James Hardie Siding. As an A+ Better Business Bureau Rated Company, family-owned and operated company, we constantly strive for excellence with outstanding installation of Infinity fiberglass window and door replacements.

Trusted Window Installation

Transform the appearance of your Colorado home with the professional services of Infinity from Marvin replacement window companies. Our experienced and knowledgeable window replacement experts provide a stress-free installation process from start to finish. Choose from high-quality Infinity fiberglass window materials for an impeccable transformation that will bring renewed joy to your home's appearance. Trust the experts at Gravina's Window Center of Littleton® to deliver exceptional results.

  • Infinity replacement windows expand 87% less than vinyl – resists expanding and contracting in any climate
  • 8 times stronger than vinyl – protects the integrity of your home
  • Resistant to leaks, seal failures and stress cracks – all things that can affect energy efficiency


  • Ultrex’s fiberglass windows and doors strength delivers narrow profiles for expanded views and more daylight
  • Our proprietary acrylic finish is fade-resistant and virtually maintenance-free
  • We offer a complete collection of styles, features and options to complement any home


Maximum Performance

Get the most out of your window installation with Gravina's Window Center of Littleton® and our 50 years worth of expertise.  Reliable Infinity from Marvin windows and doors minimize air leaks, water damage and more - delivering maximum performance for lasting savings on energy costs and enhancing home value down the line.

Worry-Free Windows

Denver homeowners looking to increase energy efficiency, curb appeal and save money on their utility bills can find the perfect solution in Infinity replacement windows and doors. Engineered glass coatings resist both heat and UV light, while durable fiberglass frames stand firm against whatever Mother Nature brings. Enjoy a new look for your home with attractive colors and window styles, plus benefit from long-term savings that come with superior insulation year after year! With Infinity Replacement Windows and Doors, you'll make an investment sure to pay off again -and again – through improved energy efficiency performance.

Patio Doors

Adding value and style to your indoor living space is easy with a brand-new replacement patio door. Infinity from Marvin fiberglass patio doors serve as a beautiful divider between the outside world and your living area, providing extra insulation in colder months and allowing rays of sunshine during warmer seasons. Not only will installing a new patio door beautify your home, but you won't have to worry about any potential disruption to your lifestyle since it can be installed without hassle or mess. When you choose the Infinity from Marvin for your patio doors, you get quality craftsmanship that will last for decades and the added bonus of enhanced security for peace of mind. Whatever style and feel you want in your living space, make it come alive with the perfect patio door from Infinity.

James Hardie Siding

For dependable performance and long-lasting beauty in siding, James Hardie stands alone. Its unique composition is specifically engineered to be tough enough for any weather conditions while still offering a palette of colors that can be tailored to your vision. No costly maintenance needed.  For those looking to invest in James Hardie Siding, selecting a siding contractor with extensive experience installing it is essential, as an incorrect installation can reduce the siding's lifespan. Furthermore, experienced siding contractors have developed strategies for installation that minimize errors, helping maximize the longevity of your home.

What are Infinity Windows?

Marvin Infinity fiberglass windows are the perfect choice for anyone looking for premium quality and superior craftsmanship. With Infinity replacement windows, you can get years of reliable performance from their Ultrex® pultruded fiberglass. Each window is designed with exclusive weather- resistant technology that keeps your home comfortable in any climate and prevents moisture damage. Additionally, Marvin's exclusive Ultrex® material further reinforces strength and beauty while helping to maintain the windows' structurally solid states over time. You can trust that you'll have a beautiful view of your surroundings without worrying about bothersome maintenance; this makes these windows the smart choice for Colorado homeowners.


Why choose Gravina's Window Center of Littleton?

     We are Colorado's Oldest Infinity from Marvin Replacement Window Retailer
Twenty plus years ago, we leveraged our deep partnership with Marvin Windows and Doors to bring Infinity from Marvin products into Colorado. Our expertise has allowed us to stay ahead of the trends for two decades - making sure homes everywhere remain comfortable year-round.

     We have been giving Back Since 1973
With decades of experience, our family-run business has brought meaningful contributions to the community and is dedicated to carrying on this tradition.

     We offer a Lifetime Warranty
With decades of experience providing home remodeling services, we understand that your residence is one of the most important aspects in life. That's why Gravina's Window Center of Littleton® guarantees our installation and products to give customers peace of mind when they decide on transforming their homes.


Highest Standards

Energy Efficiency

Professional Installation

*********** FAMILY OWNED AND OPERATED ***********


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Energy Star Certification

Energy Star Certification

The Energy Star certification, offered by the EPA and Department of Energy, is an excellent way to save money in the long term. By investing in energy-efficient products certified by this program today, individuals can cut their annual electricity costs up to a whopping 30%. Over time these savings add up; making it possible for …
Step up your window game with top-of-the-line quality from Marvin Infinity Windows

Step up your window game with top-of-the-line quality from Marvin Infinity Windows

Infinity from Marvin Fiberglass Windows Denver, CO | Gravina's Window Center of Littleton is America's oldest retailer of Infinity from Marvin windows.

Our Promise and Values

With over five decades of experience replacing windows and doors, Gravina's Window Center of Littleton® is a trusted provider for residential window replacement upgrades across Colorado. Our top-of-the-line Infinity Windows and Doors are expertly installed with meticulous care in order to ensure maximum performance and appearance. Our incomparable commitment will guarantee results that surpass expectations while providing peace of mind every step of the way.

Replacement Windows

replacement windows and doors from gravina's window center of littleton