Replacement Window and Door Shopping Made Easy
Gravina's Window Center of Littleton® is Colorado's oldest Authorized Infinity® by Marvin® window replacement company. Headquartered in Littleton, CO, we serve the entire Denver Metro area and most 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, a family-owned and operated company, we constantly strive for excellence with outstanding installation of Infinity fiberglass window and door replacements.
Infinity Fiberglass Windows
Are you ready to elevate your Colorado home's appearance with windows built to last a lifetime? Gravina's Window Center of Littleton® is the name you can trust. As Colorado's oldest and most established Infinity by Marvin dealer, we’ve spent decades perfecting the art of window replacement. Our reputation for quality and expertise has made us the go-to choice for homeowners who value durability, style, and precision.
Infinity by Marvin’s high-performance Ultrex® fiberglass frames are crafted to withstand Colorado’s harsh weather, providing a strong, energy-efficient solution that enhances curb appeal. Paired with our careful, world-class installation process, your home will experience a transformation that not only looks beautiful but stands the test of time.
Choose Gravina's Window Center of Littleton®, a family-owned name with a legacy of excellence. Let us bring your home a new level of beauty, comfort, and confidence with a team and product you can rely on.
Is it time to replace your windows?
Inefficient and drafty windows and doors affect your home in many different ways. With energy costs getting higher, it may be necessary now, more than ever, to invest in replacement windows. Getting your window and door replacement projects done professionally is easier than ever, thanks to the experts at Gravina's Window Center of Littleton®. We offer full-frame Infinity fiberglass windows that are suitable for any style of home, regardless of when it was built! Our five-star process ensures the best quality finish while causing minimal disruption to your space. Trust us with all your window replacement Denver needs and enjoy a seamless experience from beginning to end!
Infinity® by Marvin® Fiberglass Windows
Denver homeowners, tired of drafty or outdated windows? Gravina’s Window Center of Littleton® is Colorado’s oldest Infinity from Marvin dealer — trusted by thousands since 1973.
We don’t just sell windows — we install peace of mind. Whether you need full-frame window replacement or insert installations, our experienced team will deliver a smooth, professional process from start to finish. Our fiberglass windows are built with Ultrex® fiberglass—8x stronger than vinyl and designed to thrive in Colorado’s extreme weather.
Infinity windows are low-maintenance, energy-efficient, and built to last. And with our lifetime workmanship warranty, you get more than great windows — you get a partner for the life of your home.
Infinity® by Marvin® Fiberglass Patio Doors
Colorado homeowners deserve more than just a patio door — they deserve a smooth-gliding, energy-efficient door that elevates their space. At Gravina’s Window Center of Littleton®, we specialize in Infinity sliding patio doors and Infinity inswing French doors — both crafted with Ultrex® fiberglass for lasting durability. Whether you want to bring in more light, upgrade your home's security, or improve indoor-outdoor flow, we’ll help you choose the perfect patio door to fit your style and needs. Our doors are made to perform in Colorado’s unique climate — and they look stunning doing it. Explore Marvin Patio Doors →
Infinity® by Marvin® Bi-Fold Doors
Looking to blur the line between indoor comfort and outdoor living? Infinity Bi-Fold Doors from Marvin offer the perfect way to open up your space — literally. These high-performance fiberglass doors fold neatly to the side, creating wide-open views and seamless transitions to your patio, deck, or backyard. Made with Ultrex® fiberglass and engineered for Colorado’s weather extremes, Infinity Bi-Fold Doors deliver durability, energy efficiency, and smooth operation — all with a modern architectural feel. Choose configurations that match your home's design and let our team help bring your dream space to life. With Gravina’s Window Center of Littleton®, you get professional installation and a product designed to impress for decades. View Bi-Fold Door Options →
Entry Doors that Elevate Curb Appeal
Your front door isn’t just an entry point—it’s your home’s first impression. If your current door is outdated, drafty, or lacking curb appeal, it could be hurting your home’s security, comfort, and resale value. At Gravina’s Window Center of Littleton®, we offer premium fiberglass entry doors from trusted names like Therma-Tru and ProVia. These doors are engineered for energy efficiency, built to resist Colorado’s climate, and designed to elevate your home’s aesthetic from the street. Whether you're looking for a bold modern statement or timeless elegance, we’ll help you find a front door that matches your style—and your standards. Explore Entry Door Styles →
James Hardie® Siding for Colorado Homes
Faded paint, warped wood, and weather damage aren’t just cosmetic issues—they can threaten your home’s structure, efficiency, and value. Colorado’s climate demands more from your siding. James Hardie fiber cement siding is engineered to stand up to snow, sun, wind, and even woodpeckers. As the inventors of fiber cement, James Hardie continues to lead the industry in durability, beauty, and long-term performance. At Gravina’s Window Center of Littleton®, we help you choose siding that protects and transforms your home. Trust us for expert installation and unmatched product performance that adds curb appeal—and peace of mind. Explore James Hardie Siding →
Built for Colorado’s Toughest Weather Conditions
In Colorado, weather isn’t just a season, it’s a challenge. From scorching UV rays to heavy snow and hail, your home deserves replacement windows that can truly withstand the elements. That’s why Gravina’s Window Center of Littleton proudly installs Infinity® by Marvin®, made from Ultrex® fiberglass, the strongest window frame material on the market.
Ultrex is 8x stronger than vinyl, built to withstand Colorado’s extreme temperature swings without warping, cracking, or losing shape. Unlike typical vinyl windows, Ultrex expands 87% less with temperature changes, giving you a tighter, longer-lasting fit. Whether you live in Denver, Highlands Ranch, or up in Evergreen, Infinity® windows deliver unbeatable durability, clean aesthetics, and energy-saving performance for decades to come.
Plus, with Low-E glass and argon gas fills, all Infinity by Marvin windows meet or exceed ENERGY STAR® requirements, helping to reduce your energy costs while increasing year-round comfort.
Don’t settle for vinyl, choose what’s truly built for life.
Why Denver Homeowners Choose Infinity by Marvin
Infinity® replacement windows aren’t just beautiful, they’re built for performance in Colorado’s rugged climate. Made with thin Ultrex fiberglass frames, these windows maximize natural light and deliver sleek, modern profiles that elevate any home design - from classic bungalows in Wash Park to custom homes in Castle Pines.
- More visible glass for better views and brighter interiors
- Long-lasting materials that outperform vinyl and wood alternatives
- Marvin’s trusted craftsmanship backed by decades of innovation
- Engineered for Colorado and resistant to expansion, contraction, and damage
With Gravina’s Window Center of Littleton®, you're getting more than just window replacement, you’re getting an award-winning local partner trusted by thousands of Colorado homeowners. Discover the Infinity advantage and invest in replacement windows that look better, perform longer, and are designed to handle anything the Rockies throw your way.
Proudly Serving the Entire Denver Metro Area
Proudly installing Infinity by Marvin windows in Denver, Littleton, Lakewood, Highlands Ranch, Centennial, and Golden. Our showroom in Littleton welcomes homeowners from across Colorado’s Front Range.
Our Promise Since 1973
At Gravina’s Window Center of Littleton®, family isn’t just part of the business, it is the business. As Colorado’s oldest authorized Infinity® by Marvin® dealer, we’ve been helping homeowners in Littleton, Denver, and across the Front Range for over 50 years. Since 1973, three generations of the Gravina family have perfected the art of fiberglass window and door replacement, combining time-tested craftsmanship with cutting-edge performance.
Our mission is simple: to ensure every home we touch becomes more beautiful, energy efficient, and built to last. We don’t believe in shortcuts—only in doing what’s right for your home. That’s our legacy. That’s our promise. Because great homes deserve craftsmanship, not compromise.
Trusted by Colorado Homeowners Since 1973
Our reputation speaks for itself. See what real customers have to say about working with Gravina’s Window Center of Littleton®, from installation to results that last.
What Makes Infinity by Marvin Different?
From fiberglass window replacement to premium Infinity patio doors, choosing Infinity from Marvin is the smart, stress-free upgrade your Colorado home deserves. Our Infinity fiberglass replacement windows are engineered for strength, beauty, and long-term energy efficiency, offered in a wide range of sizes, shapes, and finishes to fit your home perfectly.
As the oldest Infinity from Marvin dealer in Colorado, Gravina’s Window Center of Littleton® gives you full access to Marvin’s premium product lines. Every Infinity window is crafted with Ultrex® fiberglass—a patented, pultruded material that’s 8x stronger than vinyl. The result? Long-lasting energy efficiency, tighter seals, and year-round performance built for Colorado’s demanding climate.
Understanding Infinity Fiberglass Windows
The Infinity Window is Marvin’s high-performance fiberglass replacement window line, designed to combine the classic look of wood with modern durability and low-maintenance finishes. Whether you're replacing old wood windows or upgrading from vinyl, Infinity offers unmatched strength, lasting beauty, and custom design options to fit any Denver home. All backed by the trusted service of Gravina’s Window Center of Littleton®.
As Seen On...
Financing available with approved credit. Not all applicants will qualify. Offers cannot be applied to previous customer orders and may not be combined with other discounts, promotions, or estimates. Financing is available to qualified homeowners based on creditworthiness and other criteria. A minimum purchase of four (4) Infinity® windows is required. Promotional financing terms, including 0% interest plans, are estimates only. Interest accrues from the date of purchase but will be waived if the balance is paid in full within the promotional period. Actual rates, terms, and approval are determined by the lender and may vary based on individual circumstances. This is not a guaranteed offer. Please contact us for full details on eligibility and financing options.
VISIT OUR WINDOW REPLACEMENT SHOWROOM
Located in Littleton, CO
Tired of drafty windows and renovation stress? Choose Infinity® by Marvin®, Colorado’s smarter, stress-free way to upgrade your home.
For more than five decades, Gravina’s Window Center of Littleton® has been Colorado’s trusted source for Infinity® by Marvin® fiberglass window replacement and expert installation. As a family-owned business serving the Denver Metro Area since 1973, we take pride in craftsmanship that lasts, and service that feels personal from start to finish.
