Replacement Windows in Littleton, Colorado
If you're replacing windows in Littleton, the biggest decisions are usually material, installation quality, energy performance, style, and cost. Gravina’s Window Center of Littleton® has helped Colorado homeowners make those decisions since 1973 from our showroom on Littleton Boulevard.
We specialize in Infinity® by Marvin® replacement windows made with Ultrex® fiberglass, and our window and door installations are completed by our own employees rather than subcontracted crews.
This page explains what Littleton homeowners should know before replacing their windows, including window options, fiberglass versus vinyl, installation, cost factors, and what to expect from the process.
Why Littleton Homeowners Choose Infinity® by Marvin® Fiberglass Windows
Fiberglass is often a strong fit for Colorado homes because it is strong, dimensionally stable, and less affected by temperature changes than many other window-frame materials.
Many Littleton neighborhoods include homes built from the 1960s through the 1990s, which means homeowners are often replacing original windows or earlier-generation replacement windows that have reached the end of their useful life. When that time comes, the frame material matters, especially in Colorado's combination of strong sunlight, dry air, cold winters, warm summers, and frequent temperature swings.
Littleton sits at roughly 5,350 feet above sea level. At Colorado's elevation, windows receive substantial UV exposure while also dealing with repeated heating and cooling throughout the year. Window frames naturally expand and contract as temperatures change, but some materials move more than others. Excessive movement can place additional stress on glass seals, weatherstripping, hardware, and other components over time.
Infinity® by Marvin® windows are made with Ultrex® fiberglass, a pultruded fiberglass material engineered for strength and dimensional stability. Ultrex fiberglass expands and contracts at a rate very similar to the glass it holds, helping the frame and glass move together as temperatures change.
That does not mean every Littleton homeowner automatically needs fiberglass windows. Quality vinyl windows can still make sense when lower initial cost is the primary consideration. But for homeowners who place a higher priority on long-term dimensional stability, narrower profiles, strength, and performance in Colorado's climate, fiberglass deserves serious consideration.
Fiberglass vs. Vinyl Windows in Littleton
One of the most common questions we hear is whether fiberglass is really worth the additional cost compared with vinyl. The answer depends on your home, budget, and how long you expect to stay there.
Vinyl windows generally have a lower initial price and can be a reasonable option for homeowners focused primarily on upfront cost. Fiberglass windows generally cost more, but provide greater frame strength and dimensional stability, which are advantages we believe are particularly valuable in Colorado.
We do not believe there is one window material that is right for every homeowner. Our job is to explain the differences clearly enough that you can decide which tradeoffs make sense for your house.
A Littleton Window Company Since 1973
Gravina's Window Center of Littleton® is not a national franchise. We are a locally owned company that has served Colorado homeowners since Jim Gravina started the business in 1973.
Our showroom is located at 209 W Littleton Boulevard, and Littleton has been our home base for more than five decades. We began selling Andersen windows and became an Infinity® by Marvin® dealer in 2003 as fiberglass window technology became an increasingly important part of the replacement-window market.
That history matters because replacement windows are not just a product purchase. The measurements, ordering, installation, finishing, warranty support, and service after the project all affect the long-term result.
Our window and door installations are completed by employees of Gravina's Window Center of Littleton®, not subcontracted installation companies. Keeping installation under our roof gives us direct responsibility for the work from the initial consultation through installation, final walkthrough, and future service.
We are also accredited by the Better Business Bureau and have earned thousands of customer reviews over the years. More important to us than any single rating is the fact that we have been serving homeowners from the same Littleton community since 1973.
Infinity® by Marvin® Replacement Window Options for Your Littleton Home
Littleton has an unusually wide mix of housing styles, from mid-century ranch homes and split-levels to two-story suburban homes and newer construction. The right window style depends on the opening, the architecture of the house, how you want the window to operate, and how much ventilation or glass area you want.
Infinity® Double-Hung Windows
Infinity® Double-Hung Windows provide ventilation from either the upper or lower sash and tilt inward for easier cleaning. They are a popular choice for traditional homes and for homeowners replacing older double-hung or single-hung windows.
Infinity® Casement Windows
Infinity® Casement Windows open outward with a crank and compress tightly against the frame when closed. They are a strong option when homeowners want ventilation, large areas of glass, and a tight operating seal.
Infinity® Sliding Windows
Infinity® Sliding Windows operate horizontally and work especially well in wider openings where a homeowner wants simple operation, broad views, and plenty of natural light.
Infinity® Bay and Bow Windows
Infinity® Bay Windows and Infinity® Bow Windows project outward from the home, adding depth to the room while creating wider views and bringing in light from multiple directions.
We also offer Infinity® by Marvin® patio doors, including sliding and hinged configurations. Homeowners planning a larger exterior project can also talk with us about ProVia® entry doors and James Hardie® fiber cement siding.
When Should You Replace Your Windows?
Old windows do not automatically need to be replaced simply because of their age. If your windows still operate properly, the frames are in good condition, the glass seals have not failed, and you are satisfied with their comfort and appearance, replacement may not provide enough benefit to justify the investment.
Replacement becomes more worth considering when you are dealing with problems such as difficult operation, failed insulated glass, noticeable air leakage, deteriorating frames, unwanted heat gain, poor sound control, water intrusion around the window opening, or windows that no longer fit the way you use the home.
We would rather help a homeowner understand whether replacement makes sense than assume every window we look at needs to come out.
What to Expect During Your Window Replacement
After more than five decades in the window business, we have learned that the installation process matters just as much as the window itself. A premium window installed poorly can still become a problem.
The window matters. The install is the difference.
1. In-Home Consultation
One of our design consultants visits your home, looks at the existing windows and openings, discusses what you are trying to improve, and walks you through appropriate product options. That can include energy efficiency, appearance, ventilation, noise reduction, maintenance, glass packages, colors, hardware, and budget. Once we understand the scope of the project, we provide a detailed quote so you know what the project will cost before you make a decision.
2. Final Measurements and Window Specifications
Once you decide to move forward, the project is measured and the final specifications are confirmed. Infinity® by Marvin® replacement windows are manufactured specifically for your openings rather than pulled from a warehouse shelf in standard sizes.
3. Installation Day
Our installers protect the work areas, remove the existing windows, prepare the openings, install the new windows, insulate and seal around them, complete the necessary interior and exterior finish work, and clean everything up before the job is finished.
Installation time depends on the number of windows, their size and location, access to the openings, existing conditions, and the amount of finish work required. A small project may be completed in a few days, while larger or more complicated projects can take longer.
4. Final Walkthrough
When the work is complete, we review the installation with you, make sure the windows operate correctly, explain basic operation and care, and address anything that needs attention before considering the project finished.
5. Warranty and Service
Your relationship with us does not end when the installation crew leaves. Infinity® by Marvin® provides its applicable product warranty, and Gravina's Window Center of Littleton® stands behind our installation workmanship. If an issue comes up later, you call us here in Littleton.
What We Have Learned Replacing Windows in Littleton Homes
One advantage of working in the same market for decades is that we have seen just about every type of Littleton home, window opening, and replacement situation.
Homes across Littleton and the southwest Denver metro vary quite a bit in age and construction, which means the window openings and replacement challenges vary too. We regularly see everything from large picture windows and horizontal sliders to double-hung windows, brick openings, older trim details, and homes with a mix of original and previously replaced windows.
That matters because replacing a window correctly requires understanding what is already there. The same Infinity® window can require a different installation approach depending on the exterior cladding, interior trim, condition of the opening, previous installation, and original construction of the house.
This is also why we do not believe homeowners should choose a replacement window based solely on a glass-performance number, frame material, brand name, or price per window. The product and the installation have to work together.
Serving Littleton and Surrounding Communities
Our showroom at 209 W Littleton Boulevard is centrally located for homeowners throughout Littleton and the southwest Denver metro area.
We regularly work in Littleton, Columbine, Columbine Valley, Ken Caryl, Bow Mar, Highlands Ranch, Centennial, Englewood, Castle Pines, and surrounding Denver-area communities.
If you want to see Infinity® by Marvin® windows in person before making a decision, you are welcome to visit our Littleton showroom and compare frame styles, colors, hardware, glass options, and operating styles.
See all Colorado service areas
Showroom:
209 W Littleton Blvd
Littleton, CO 80120
Phone: 303-794-0490
Littleton Replacement Window FAQs
Are fiberglass windows worth it in Colorado?
Fiberglass can be worth the additional cost for Colorado homeowners who value frame strength, dimensional stability, narrow profiles, and long-term performance. It is not necessarily the best choice for every budget, but Colorado's temperature changes and strong sunlight are good reasons to compare fiberglass with vinyl before making a decision.
Is fiberglass better than vinyl for Littleton homes?
Fiberglass and vinyl have different strengths. Vinyl typically costs less initially, while fiberglass generally offers greater strength and dimensional stability. The better choice depends on your budget, the house, the size and style of the windows, and how long you expect to remain in the home.
How long does it take to replace windows?
A smaller replacement-window project can often be installed in 2-3 days. Whole-home projects or installations involving large openings, difficult access, extensive trim work, or unusual existing conditions may take multiple days. We establish the expected installation schedule before work begins.
Can replacement windows be installed during the winter in Littleton?
Yes. Replacement windows can be installed during much of the Colorado winter. Our installers generally work one opening at a time so the house is not left exposed. Severe weather or unusually low temperatures may require an installation to be rescheduled.
Should I replace all of my windows at once?
Not necessarily. Some homeowners replace an entire house at once, while others divide the project into phases based on budget, window condition, exposure, or which rooms matter most. There is nothing inherently wrong with replacing the windows that need attention first.
Does Gravina's Window Center of Littleton® use subcontractors for window installation?
No. Our window and door installation crews are employees of Gravina's Window Center of Littleton®. We keep installation responsibility in-house so the company that sells and measures your windows is also accountable for how they are installed.
Proud Partner of the Colorado Avalanche
Gravina's Window Center of Littleton® is a proud partner of the Colorado Avalanche. As a Colorado company that has been based in Littleton since 1973, we are proud to support one of the organizations that brings our community together.
Page updated September 1, 2026.