Replacement Windows in Littleton, Colorado

Gravina's Window Center of Littleton® has been replacing windows in Littleton homes since 1973. As a family-owned company headquartered at 209 West Littleton Boulevard, we are part of the community we serve. Three generations of homeowners along the Front Range have trusted us with their window, door, and siding projects because we treat every home the way we would treat our own.

We are Colorado's oldest Infinity by Marvin dealer, a distinction we have held since 2003, making us the third-longest-tenured Infinity retailer in the nation. That partnership means direct access to the highest tier of Marvin's fiberglass window and door products, factory-level training for our installation teams, and a depth of product knowledge that comes from two decades of specialization.

If you are considering replacement windows for your Littleton home, we invite you to visit our showroom, call us at 303-794-0490, or request a free in-home consultation.

Why Littleton Homeowners Choose Infinity by Marvin Fiberglass Windows

Most of the homes in Littleton were built between the 1960s and 1990s, which means the original windows in many of these homes are well past their expected lifespan. When it comes time to replace them, the material you choose matters more than most homeowners realize, especially at Colorado's altitude.

Littleton sits at roughly 5,350 feet of elevation. At that altitude, ultraviolet exposure is significantly more intense than at sea level, and daily temperature swings can exceed 50 degrees in a single day. Vinyl windows expand and contract with those swings, which breaks down seals over time and leads to fogging, drafts, and lost efficiency. Fiberglass does not.

Infinity by Marvin windows are built with Ultrex pultruded fiberglass, a material engineered to remain dimensionally stable across extreme temperature ranges. Ultrex fiberglass expands and contracts at nearly the same rate as the glass it holds, which keeps the seal intact year after year. That stability is the reason fiberglass consistently outperforms vinyl in high-altitude, high-UV climates like Colorado's Front Range.

A Local Littleton Company with 50+ Years of Experience

Gravina's Window Center of Littleton® is not a national franchise. We are a family-owned company that has operated from our Littleton Boulevard showroom for over five decades. Our founder, Jim Gravina, started the business in 1973 selling Andersen Windows, and in 2003 we became one of the first companies in Colorado to partner with Infinity by Marvin when fiberglass window technology reached a point where we believed it was the superior product for Colorado homes.

Every window and door installation is completed by our own W2 employees. We do not use subcontractors. Our installers are trained, insured, and employed directly by us, which means accountability stays under one roof from your initial consultation through final walkthrough and beyond.

That commitment to in-house quality is reflected in our track record: an A+ rating with the Better Business Bureau, a 4.9-star rating on Google, and more than 50,000 completed window and door projects across the Denver metro area.

Infinity by Marvin Replacement Window Options for Your Littleton Home

Whether your home is a 1970s ranch in Columbine Valley, an 1980s two-story in Grant Ranch, or a newer build in Highlands Ranch, we offer a full range of Infinity by Marvin window styles designed for Colorado's climate and your home's architecture.

Infinity Double Hung Windows are the most popular choice for Littleton homeowners replacing original builder-grade windows. They tilt in for easy cleaning and provide excellent ventilation.

Infinity Casement Windows crank open outward, creating a tight seal when closed that performs exceptionally well against Colorado's wind-driven rain and snow.

Infinity Sliding Windows offer a clean, modern sightline and are ideal for wide openings in living rooms and kitchens where you want maximum glass and natural light.

Infinity Bay and Bow Windows add dimension to flat walls and create space for plants, seating, or display areas while flooding the room with light from multiple angles.

We also offer a complete line of Infinity by Marvin patio doors, including sliding, French, and bifold configurations, as well as ProVia entry doors and James Hardie fiber cement siding for homeowners looking to address multiple exterior projects in a single engagement.

What to Expect During Your Window Replacement

We have refined our process over 53 years to make window replacement straightforward and stress-free. Here is how it works.

Consultation. One of our experienced design consultants visits your home to assess your current windows, measure each opening, discuss your priorities (energy efficiency, noise reduction, aesthetics, budget), and walk you through product options with physical samples. There is no high-pressure sales presentation, just an honest conversation about what your home needs.

Design and Order. Once you choose your windows, we finalize specifications including frame color, hardware finish, glass package, and grid pattern. Every Infinity by Marvin window is custom-built to your exact measurements at Marvin's manufacturing facility.

Installation. Our W2 installation crew arrives on the scheduled date, protects your interior spaces, removes old windows, installs your new Infinity fiberglass windows with proper flashing and insulation, and cleans up completely before they leave. Most standard window replacements are completed in a single day.

Follow-Up. We inspect the completed work, walk you through the operation of your new windows, and ensure everything meets our standards and yours. Your Infinity by Marvin limited lifetime warranty is registered and active from day one.

Serving Littleton and Surrounding Communities

Our Littleton showroom at 209 West Littleton Boulevard is centrally located to serve homeowners throughout the southwest Denver metro area. We regularly complete projects in Littleton, Columbine, Columbine Valley, Ken Caryl, Highlands Ranch, Centennial, Englewood, Bow Mar, and Castle Pines, as well as throughout the broader Denver metro and along the Front Range.

If you would like to see and touch our products before making a decision, you are welcome to visit the showroom Monday through Friday from 8:00 a.m. to 5:00 p.m. or Saturday from 9:00 a.m. to 3:00 p.m. No appointment is necessary.

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Showroom Address: 209 W Littleton Blvd, Littleton, CO 80120

Phone: 303-794-0490

Proud Partner of the Colorado Avalanche

Gravina's Window Center of Littleton® is a proud presenting partner of the Colorado Avalanche. Our partnership with one of Colorado's most respected sports organizations reflects our commitment to the community and our standing as a trusted Colorado brand.

Page Updated May 7, 2026