Infinity® by Marvin® Replacement Windows & Doors in Denver and Littleton, CO
Gravina's Window Center of Littleton® is Colorado's oldest Infinity® by Marvin® dealer. We have been family-owned in Littleton since 1973, authorized to sell Infinity® by Marvin® since 2003, and we hold Diamond Partner status, the program's highest dealer tier.
We install Infinity® by Marvin® fiberglass replacement windows and patio doors, ProVia® entry doors, and James Hardie® siding across the Denver metro area and Colorado's Front Range.
Infinity windows are built with Ultrex® fiberglass, which the manufacturer reports is eight times stronger than vinyl. Window and door projects are installed by our own W-2 crews, not subcontractors, and backed by a lifetime workmanship warranty. Siding is installed by a dedicated crew we have worked with for years.
Infinity is not the cheapest window, and it is not right for every home. If you are selling within a year, vinyl costs less. Infinity makes sense when you intend to stay.
Gravina's Window Center of Littleton® maintains an A+ rating with the Better Business Bureau. Showrooms in Littleton and North Denver.
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
Gravina’s Window Center of Littleton® is Colorado’s oldest Infinity by Marvin® dealer, authorized since 2003 and family-owned since 1973. We install Infinity fiberglass replacement windows for Denver metro homeowners in both insert and full-frame configurations, and we explain the difference before you decide which fits your openings.
Infinity windows are built with Ultrex® fiberglass, which the manufacturer reports is eight times stronger than vinyl.
Every window project is installed by our own W-2 crews, not subcontractors, and backed by our lifetime workmanship warranty.
Learn more about Infinity Windows →
Infinity® by Marvin® Fiberglass Patio Doors
Gravina’s Window Center of Littleton® installs Infinity® by Marvin® sliding patio doors and Infinity inswing French doors, both built with Ultrex® fiberglass.
We measure the existing opening, review threshold and sill conditions, and confirm swing or slide direction before ordering.
Patio door installations are completed by our in-house crews and carry the same lifetime workmanship warranty as our window projects.
ProVia® Fiberglass and Steel Entry Doors
Gravina’s Window Center of Littleton® installs ProVia® entry doors, including the Signet® premium fiberglass line and the Legacy® steel line, configured with your choice of glass, finish, hardware, and sidelites.
During the in-home consultation we check the existing jamb, threshold, and framing condition to determine whether a slab replacement or a full door system is the appropriate scope. Rot at the sill or an out-of-square frame changes that answer, and it is better to find it before you order.
Entry door installations are completed by our own in-house crews and backed by our lifetime workmanship warranty.
Infinity® by Marvin® Bi-Fold Doors
Infinity® by Marvin® bi-fold doors fold to one side or bi-part from the center to open a full wall to a patio or deck. They are built with Ultrex® fiberglass and are available in multiple panel configurations.
Bi-fold openings carry more weight and more moving hardware than a standard patio door, so header capacity and sill flatness determine what is possible. Gravina’s Window Center of Littleton® evaluates the opening on site before quoting a configuration.
Installation is completed by our own in-house crews and backed by our lifetime workmanship warranty.
James Hardie® Fiber Cement Siding for Colorado Homes
Gravina’s Window Center of Littleton® installs James Hardie® fiber cement siding on Denver metro and Front Range homes. James Hardie invented fiber cement siding and manufactures it in climate-specific formulations. Colorado homes fall under the HardieZone® 5 specification, engineered for freeze-thaw cycling and high-altitude UV exposure.
Before siding goes on, we assess the existing sheathing, flashing, and water-resistive barrier. Wall conditions found during teardown can change scope, and identifying them before demolition is what keeps a siding project on schedule.
ColorPlus® Technology finishes are applied at the factory rather than on site, which produces a more consistent finish than field painting and reduces future repainting cycles.
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, or learn how Infinity fiberglass windows and doors perform in Colorado homes.
What to Expect When You Replace Windows With Gravina's Window Center of Littleton®
Every project starts with a free in-home consultation. We measure each opening, check the condition of the existing frames, sills, and surrounding materials, and determine whether insert replacement or full-frame replacement is appropriate. Those two methods carry different costs and different results, and we explain the difference before you decide.
Not every window needs replacing. If a failed seal, worn hardware, or a repairable frame is the actual problem, we will tell you that.
Windows are made to order, so there is a lead time between your order and your installation date. We give you that window up front rather than after the deposit.
Installation is completed by our own in-house crews. Our dedicated service department handles anything that comes up afterward, which means a local phone number and a person who has your file, not a manufacturer hotline.
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 from the 1950s and 60s, older brick bungalows, foothills and mountain-area properties at elevation, contemporary residences, and newer suburban construction. Openings in these homes vary enough that measurements and installation method are determined per home, not per subdivision.
Homeowners can visit either showroom to see window and door options, compare materials in person, and speak with a member of our team before making a decision.
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.