Premium Fiberglass Window & Door Replacement in Denver, CO — Backed by 50+ Years of Trust
At Gravina’s Window Center of Littleton®, we don’t just replace windows—we help Colorado homeowners make smart, lasting upgrades. Since 1973, families in Denver, Littleton, and across the Front Range have trusted our expert team for Infinity from Marvin® fiberglass window installations, premium patio doors, energy-efficient entry doors, and James Hardie® siding—engineered specifically for Colorado’s tough climate. As a family-owned business with an A+ BBB rating and hundreds of 5-star reviews, we take pride in delivering comfort, durability, and long-term value. Schedule your free in-home consultation and experience why generations of Coloradans choose Gravina’s Window Center of Littleton®.
How We Make Window Replacement Easy
Step 1 – Let’s Talk Windows & Doors
Just give us a call or fill out our quick form to schedule your free in-home consultation. No pressure. No pushy sales tactics. Just honest advice from a local team who’s been doing this for 50+ years.
Step 2 – Get a Custom Plan & Quote
One of our friendly design consultants will come to your home, take measurements, and walk you through options tailored to your style, budget, and goals. You’ll get a clear, all-in-one quote—no surprises.
Step 3 – Sit Back While We Handle Everything
From expert installation to trim work, stain, and clean-up—we do it all. Our certified team installs your Infinity from Marvin fiberglass windows with precision and care, backed by our service and warranty.
Is It Time to Replace Your Windows in Colorado?
If you're dealing with drafty windows, higher energy bills, or outside noise creeping in, your home in Denver, Littleton, or anywhere along the Front Range may be overdue for an upgrade. Infinity fiberglass windows offer energy efficiency, strength, and peace of mind—engineered for Colorado’s climate.
At Gravina's Window Center of Littleton®, we specialize in full-frame installations that enhance both performance and design. Our proven 5-star process minimizes disruption, ensures expert craftsmanship, and delivers results that stand the test of time—no matter the age or style of your home.
Why Choose Fiberglass Window Replacement in Denver, CO?
Partner with Gravina’s Window Center of Littleton—Colorado’s most experienced Infinity from Marvin dealer, trusted by homeowners since 1973 for quality, integrity, and results that last.
- Installed by Marvin-certified experts for flawless performance
- Ultrex® fiberglass stands up to Colorado’s harsh temperature swings
- ENERGY STAR®-rated glass to help reduce your utility bills
- Clean, timeless design options that elevate your curb appeal
Whether you’re in Highlands Ranch, Arvada, or anywhere in between, we help Denver-area homeowners upgrade with confidence. Let us show you what window replacement done right really looks like.
Infinity® Fiberglass Replacement 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® 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® 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 Make a Lasting First Impression
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 →
Ultrex® Fiberglass Windows: Built for Colorado’s Toughest 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® from Marvin—engineered with 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 from 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 Homeowners in Colorado Prefer Infinity from Marvin
Infinity replacement windows aren’t just beautiful—they’re purpose-built for performance in Colorado’s rugged climate. Made with ultra-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—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.
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 from 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.
"I can’t say enough about how professional, fast, and clean the team was. Our Infinity windows look incredible!"
– Sarah M., Highlands Ranch
"We’ve done multiple projects with Gravina’s Window Center of Littleton. Always on time, respectful, and top-tier craftsmanship."
– David L., Denver
"From sales to install, everyone was knowledgeable and transparent. No high pressure, just great service from Gravina’s Window Center of Littleton."
– Lisa T., Littleton
Why Infinity from Marvin®?
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.
What Are Infinity 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...
*With approved credit. Not all applicants will qualify. Special offers are not valid for previous customer orders and cannot be combined with other discounts, offers, or estimates. Financing available to qualified homeowners based on creditworthiness and other criteria. Minimum purchase of (4) Infinity Windows required. Offer expires on 6/30/25. Financing terms, including 0% interest for up to 24 months, are estimates. Interest accrues from the date of purchase but is waived if paid in full within the promotional period. Actual rates and terms depend on credit approval and individual circumstances. See retailer for full terms and conditions. This is not a guaranteed offer. Inquiries regarding eligibility and financing options are encouraged.
VISIT OUR WINDOW REPLACEMENT SHOWROOM
Tired of drafty windows and renovation headaches? Choose Infinity from Marvin, Colorado’s smarter, stress-free way to replace windows and doors.
As Colorado’s oldest authorized Infinity from Marvin replacement window provider, Gravina’s Window Center of Littleton® delivers unmatched experience and lasting craftsmanship you can count on. Family-owned and A+ rated by the Better Business Bureau, we’ve been serving homeowners across the Denver Metro Area and the Front Range since 1973.
Our expert installation team specializes in full-frame replacement using durable, energy-efficient Infinity Ultrex® fiberglass windows and doors. From first consultation to final cleanup, we make the process seamless—improving your home’s comfort, appearance, and performance. Discover why generations of Colorado homeowners trust Gravina’s Window Center of Littleton® for replacement windows that are built for life.