Replacement Windows - Denver, CO

For over five decades, Denver homeowners have trusted Gravina’s Window Center of Littleton® for top-quality window replacement. As Colorado’s original Infinity from Marvin dealer, we specialize in energy-efficient fiberglass windows built to withstand harsh weather, improve your home's value, and reduce energy costs. Backed by an A+ BBB rating, a lifetime warranty, and 450+ five-star reviews, we’ve earned our reputation as Denver’s most trusted window company.

Infinity Fiberglass Windows & Doors

With energy-efficient fiberglass windows and doors, you can save money on your energy bills while enhancing the look and feel of your home. Trust the experts at Gravina's Window Center of Littleton® to provide the best possible solution for your replacement needs. 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 indoor comfort all day and give you priceless peace of mind. 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.  Your home deserves nothing less. Trust the name your neighbors have relied on since the beginning.

 

Expert Window Replacement in Denver, CO

When you're ready to upgrade your Colorado home, trust the team that's been doing it right since 1973. At Gravina’s Window Center of Littleton®, we’re proud to be Colorado’s original Infinity from Marvin dealer—bringing comfort, beauty, and lasting value to homes across Denver.

Our expert craftsmen don’t just install windows—they help transform your home with durable fiberglass windows and doors designed for the Rocky Mountain climate. From your first consultation to the final walkthrough, we make the process smooth, respectful, and refreshingly stress-free.

Your home deserves more than a quick fix—it deserves craftsmanship that stands the test of time. That’s why so many Denver homeowners have trusted us for generations. Ready to get started? Let’s make your home something you’re proud of again.

 

 

We’re the family-owned company that’s been mastering our craft for generations

At Gravina’s Window Center of Littleton®, we don’t just replace windows—we help restore your faith in true craftsmanship. As a family-owned business, our roots run deep. Everything we do is built on the same values your home was: trust, integrity, and a commitment to doing things the right way—every single time.

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Why Denver Homeowners Choose Gravina’s Windwow Center of Littleton for Window Replacement

Gravina’s Window Center of Littleton® has been Colorado’s go-to for top-quality window replacement since 1973. As the state’s original Infinity from Marvin dealer, we’ve helped thousands of homeowners upgrade with confidence.

We’re a family-owned company that believes in doing things the right way—no gimmicks, no pressure. Just honest advice, premium products, and craftsmanship you can count on. From fiberglass windows and bifold patio doors to James Hardie Siding and ProVia entry doors, we offer free consultations to help you find the perfect fit for your home.

Our Infinity windows won’t warp, bow, or rot—and they come in a variety of colors and styles to match your Denver home’s personality. Let our experienced team guide you through a stress-free transformation you’ll love.

Gravina's Window Center of Littleton® is Colorado's oldest Authorized Infinity window replacement company. As a family-owned company in Denver, CO, we proudly offer free consultations on various products, including Infinity fiberglass windows and doors, James Hardie Siding, Provia entry doors, and bifold patio doors. Plus, as an A+ Better Business Bureau-rated company, you can trust that we always strive for excellence in our installations. Let us help you transform your home today!

 Contact our team to get started with your free quote.

 

Services We Offer

Let’s Get You a Free Quote on New Windows

Get started today with a free, no-pressure quote from Denver’s most trusted window experts. We’ll help you choose the right style, walk you through your options, and make sure everything’s done right the first time.

Infinity from Marvin: Built for Colorado. Built to Last.

best Replacement Windows for your home

 

  • Infinity replacement windows expand 87% less than vinyl and resist expansion and contraction in any climate.
  • Eight 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

infinity from marvin ultrex frames

  • 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 and décor

Quality Products. Professional Installation. No Guesswork.

Give us a call, and we’ll give you a free, no-pressure quote on Infinity from Marvin Windows. You’ll see why so many Denver homeowners trust us to boost their home’s beauty, comfort, and energy efficiency—with expert installation that gets it right the first time.

What are Infinity Windows?

Infinity® from Marvin Windows are built with Ultrex® pultruded fiberglass — 8x stronger than vinyl and engineered to perform in Colorado’s toughest conditions. They resist warping, leaks, and moisture damage, keeping your home more comfortable and energy-efficient year-round.

And the best part? They’re virtually maintenance-free and built to look stunning for decades to come. Infinity replacement windows are strong on the outside. Beautiful from the inside. That’s the power of Infinity.

Maximum Performance for Colorado Homes

With over 52 years of experience, Gravina’s Window Center of Littleton® knows what works in Colorado homes. Our Infinity fiberglass windows are built to seal tight, reduce energy loss, and boost your home’s long-term value. We don’t just install windows—we deliver lasting performance.

Worry-Free Window Replacement

Denver homeowners can save money and improve their homes with Infinity replacement windows and doors. These products increase energy efficiency and curb appeal. Special glass coatings resist heat and UV light, while strong fiberglass frames withstand any weather conditions.

Refresh the appearance of your home with pleasant colors and window designs. Additionally, you can save money every year by ensuring excellent insulation. Invest in Infinity Replacement Windows and Doors for improved energy efficiency performance that will pay off repeatedly.

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 are a lovely way to separate the outside from your living area. They keep your home warmer in winter and let in sunlight in summer.

Installing a new patio door will make your home look nice. We can easily install it without causing any problems or mess. Choose Infinity from Marvin patio doors for lasting quality and added security. Whatever style and feel you want in your living space, make it come alive with the perfect patio door from Infinity.

James Hardie Siding

James Hardie stands alone for dependable performance and long-lasting beauty in siding. It withstands any weather, and you can customize it with different colors to match your preferences.

For those looking to invest in James Hardie Siding select a contractor with experience installing it. Incorrect installation can shorten the siding's lifespan. Furthermore, experienced siding contractors have developed strategies for installation that minimize errors, helping maximize the longevity of your home.

Fiberglass Replacement 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.

Every window has special weather-resistant technology to keep your home cozy in any weather and protect against moisture. Marvin's special Ultrex® material makes the windows strong and beautiful and keeps them structurally solid for a long time. You can trust these windows for a beautiful view and no maintenance. They are the smart choice for Colorado homeowners.

 

Why Choose Gravina’s Window Center of Littleton®?

     Colorado's Oldest Infinity from Marvin Dealer

     50+ Years of Trusted Service in Colorado

     Free Quotes | Lifetime Warranty

     Energy-Efficient Fiberglass Windows

     Family-Owned & Locally Operated

Call or contact us today to learn more about our Infinity replacement windows and see how we can change your Denver-area home with a premier window or door replacement solution you can count on.

 

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Our Promise to You

At Gravina’s Window Center of Littleton®, we’ve spent over 52 years earning the trust of Colorado homeowners—one window, one door, one family at a time.

We don’t just install Infinity fiberglass windows—we stand behind every project with the same pride and precision we’d expect in our own homes. Our team is dedicated to getting it right, doing what we say, and giving you lasting peace of mind from the very first call to the final walkthrough.

Thank you for considering us. We’re honored to help you improve your home—and we’ll treat it like it’s our own.

Replacement Windows

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