Infinity® by Marvin® Replacement Windows & Doors in Denver and Littleton, CO
Gravina's Window Center of Littleton® is a family-owned Colorado replacement window and door company serving homeowners since 1973. Headquartered in Littleton, we have been an authorized Infinity by Marvin® dealer since 2003 and serve homeowners throughout the Denver metro area and much of Colorado's Front Range.
We provide free in-home consultations for Infinity fiberglass replacement windows, patio doors, entry doors, and James Hardie siding. Window and door projects are installed by our own in-house crews and backed by a lifetime workmanship warranty.
Gravina's Window Center of Littleton® maintains an A+ rating with the Better Business Bureau. Learn more about Infinity fiberglass replacement windows and doors and how they perform in Colorado homes.
Why Colorado Homeowners Have Trusted Gravina's Window Center of Littleton® Since 1973
Colorado homes face intense sunlight, temperature swings, snow, wind, and dry conditions that can expose weaknesses in aging window frames and seals. Infinity® by Marvin® replacement windows are made with Ultrex® fiberglass, a strong, low-maintenance material designed to resist expansion, contraction, warping, and corrosion.
Infinity replacement windows can improve the appearance, comfort, and everyday performance of a home while preserving a narrower frame profile than many traditional replacement-window materials. Homeowners can choose from multiple window styles, exterior colors, hardware finishes, and interior options to complement both traditional and contemporary Colorado homes.
The product is only part of the project. Gravina's Window Center of Littleton® evaluates each opening, explains the available options, and installs replacement windows with our own in-house crews. Window and patio door installations are backed by our lifetime workmanship warranty and supported by a dedicated service department after the project is complete.
Infinity® by Marvin® Fiberglass Replacement Windows
Drafts, condensation between the panes, difficult operation, damaged frames, and noticeable temperature differences near the glass can all indicate that a window is no longer performing as it should. Older windows may also allow more outside noise, air leakage, and solar heat into the home.
Not every problem requires full replacement. During a consultation, Gravina's Window Center of Littleton® evaluates the condition of the existing windows, frames, openings, and surrounding materials to help determine whether repair or replacement is the more practical option.
When replacement is appropriate, we offer Infinity® fiberglass windows in a range of styles and configurations for Colorado homes. Our team can also explain the differences between insert replacement and full-frame replacement so homeowners understand what is included before making a decision.
Explore Infinity fiberglass window styles and design options.
Infinity® by Marvin® 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® 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.
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.
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.
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.
Windows Built for Colorado’s Toughest Weather Conditions
Colorado windows must perform through intense sunlight, rapid temperature changes, snow, wind, hail, and dry conditions. These environmental stresses can cause some window-frame materials to expand, contract, warp, or lose their fit over time.
Gravina's Window Center of Littleton® installs Infinity® by Marvin® replacement windows made with Ultrex® fiberglass. Ultrex fiberglass is engineered to remain stable through changing temperatures while resisting warping, corrosion, and moisture-related deterioration.
According to the manufacturer, Ultrex fiberglass is eight times stronger than vinyl and expands significantly less as temperatures change. That dimensional stability helps window frames maintain their shape and supports consistent operation and long-term performance in Colorado homes.
Available glass packages can include Low-E coatings, insulating glass, and argon gas to help manage heat transfer, solar heat gain, and year-round comfort. The appropriate glass package depends on the window style, orientation, elevation, and specific needs of the home.
Compare fiberglass and vinyl replacement windows.
Why Colorado Homeowners Have Trusted Gravina's Window Center of Littleton® Since 1973
Gravina's Window Center of Littleton® has served Colorado homeowners since 1973. Over more than five decades, our family-owned company has worked on homes throughout the Denver metro area and Colorado's Front Range.
We have been an authorized Infinity® by Marvin® dealer since 2003, giving our team extensive experience evaluating, specifying, and installing Infinity fiberglass windows and patio doors. We also offer ProVia® entry doors and James Hardie® siding for homeowners completing broader exterior remodeling projects.
Window, patio door, and entry door projects are installed by our own in-house crews and backed by a lifetime workmanship warranty. Our dedicated service department remains available after installation, giving homeowners a local point of contact if they need assistance in the future.
Homeowners can visit our showrooms in Littleton and North Denver to see window and door options, compare materials, and speak with a member of our team before making a decision.
Replacement Windows and Doors Across Colorado’s Front Range
From our showrooms in Littleton and North Denver, Gravina's Window Center of Littleton® serves homeowners throughout the Denver metro area and many surrounding Front Range communities. Our service area includes Littleton, Denver, Highlands Ranch, Centennial, Lakewood, Golden, Castle Rock, Parker, Lone Tree, and nearby communities.
Our team works with a wide range of Colorado homes, including mid-century ranches, older brick homes, mountain-area properties, contemporary residences, and newer suburban construction. Each project begins with an evaluation of the existing openings, the home’s design, and the homeowner’s priorities.
What Colorado homeowners say about Gravina's Window Center of Littleton®
Our reputation is built on results. Thousands of homeowners across the Denver metro area have trusted Gravina's Window Center of Littleton® with their windows, doors, and siding, and their reviews tell the story.
As Seen On...
New windows now, with payment options designed to fit your budget. Explore available financing options for Infinity® by Marvin® windows and doors.
Financing is available with approved credit.Financing is provided by Service Finance Company, LLC. Approval, credit limits, interest rates, monthly payments, and repayment terms are determined by the lender based on the applicant’s creditworthiness and other eligibility requirements. Not all applicants will qualify.
This promotional offer requires a minimum purchase of four (4) Infinity® by Marvin® windows. Offers cannot be applied to previous purchases or combined with other discounts, promotions, quotes, or estimates unless specifically stated in writing.Financing programs may have separate minimum project or financed-amount requirements.
Important information about promotional no-interest financing: Interest begins accruing on the original purchase date but is waived when the full promotional balance is paid within the stated promotional period. If the promotional balance is not paid in full by the end of that period, interest may be charged from the original purchase date on the full promotional amount at the rate stated in the financing agreement. Minimum monthly payments may be required and may not be sufficient to pay the balance in full before the promotional period ends.
Financing examples shown on this website are for general informational purposes only and are not guaranteed offers. Actual rates, payments, promotional periods, and terms may vary and are subject to change. Review our window, door, and home-improvement financing options or contact Gravina’s Window Center of Littleton® for current program details. Carefully review the lender’s written financing agreement before signing.
Visit Our Infinity® by Marvin® Window and Door Showrooms
Locations in Littleton and North Denver, Colorado
Replace Your Windows Once, Not Twice. Infinity® by Marvin® fiberglass windows, installed in thousands of Colorado homes by Gravina's Window Center of Littleton®.
Your windows should be the last thing you ever worry about. Gravina’s Window Center of Littleton® has served Colorado homeowners since 1973 and has installed Infinity® by Marvin® fiberglass replacement windows in thousands of homes across the Denver metro area. Our window projects are completed by our own W-2 installation crews, not subcontractors, and backed by a lifetime workmanship warranty. As Colorado’s oldest Infinity dealer and an Infinity Diamond Partner since 2003, we have built our reputation one home at a time. Visit our Littleton or North Denver showroom to see Infinity windows in person, or request a free consultation.