Gravina's Window Center of Littleton® Reviews
Gravina's Window Center of Littleton® holds a 4.9-star average across 600+ Google reviews from homeowners throughout the Denver metro area and the Colorado Front Range.
Since 1973, we have replaced windows, patio doors, and entry doors for Colorado homeowners. We are Colorado's oldest Infinity by Marvin® dealer and the third oldest Infinity by Marvin® dealer in the United States. Our own installation crews handle every window, patio door, and entry door project, and our dedicated service department backs that work with a lifetime workmanship warranty.
How to Read Window Company Reviews
Star ratings tell you less than the details do. When you read reviews for any window company, including ours, look for three things:
- The installation. Did the crew show up on time, protect the home, and clean up? Most window problems trace back to installation, not the window itself.
- The follow-through. When something went wrong, how fast did the company respond, and did they fix it?
- The sales experience. Did the homeowner feel informed or pressured?
No window company gets every project perfect. What matters is what happens next. When a customer tells us something went wrong, our service department follows up directly to make it right. You can read every review, and our responses, on Google.
What Colorado Homeowners Say About Gravina's Window Center of Littleton®
Replacement Windows
"We decided to replace our problematic construction grade, black vinyl windows with an upgrade to Marvin Infinity Fiberglass windows from [Gravina's Window Center of Littleton®]. ... To a person, everyone we dealt with was an employee of their company (no contractors used), and every single person performed their job as if it was their own home (not ours). ... Replacing 100% of our windows with a high-end fiberglass product is a big investment, and we couldn't have been happier than we were with [them]!"
Rich C. - Whole-home fiberglass window replacement - August 2026, via Google
"We used [Gravina's Window Center of Littleton®] to replace most of the windows in our house. Marvin Infinity windows look amazing and worth the upgrade. Process from start to finish was great. Super helpful during the order phase through install. Very professional crew!"
Tim M. - Window replacement - June 2026, via Google
"[Gravina's Window Center of Littleton®] did an absolutely fantastic job installing my new windows and also helped with some follow up work. I used them before this job and I will always recommend them. The products are first class and well made."
Tia J. - Repeat customer, window replacement - September 2026, via Google
Patio Doors
"I was in need of a new sliding glass patio door; my old one was the original patio door when the house was built. The back of my house faces the east and, in the mornings until late afternoon it gets extremely warm in my family room due to the sun. ... I visited a couple of window stores, and all they had were vinyl patio doors which I did not want because they might warp because of the heat and cold. I went to the [Gravina's Window Center of Littleton®] showroom and looked at their products, and I talked to a gentleman named Lou. He showed me the different products made of fiberglass which is what I wanted. ... One of the things that I liked is that the installers were actually [their] employees. The door looks great and my family room is very cool as a matter of fact my whole house has been a lot cooler because of the new door."
James M. - Fiberglass sliding patio door - October 2026, via Google
"My sister and I each got estimates from three different window places, and it was easy to see that [Gravina's Window Center of Littleton®] was the best choice. ... They were the only company that said they could install my sliding glass door while keeping my old security door in place which saved me a lot of money. Six months later when I felt like the lock was getting sticky, they offered to come out for free to adjust it."
Susan B. - Sliding glass patio door - June 2026, via Google
"First off, they showed up when they said that they would. They were both extremely professional and very nice. They laid down drop clothes inside the house to keep everything clean, and they took all of the mess out with them."
Angel B. - Sliding glass patio door - August 2026, via Google
Entry Doors
"I did a lot of research on window installers and [Gravina's Window Center of Littleton®] kept showing up at the top of the list. ... I interviewed them plus 2 other installers. [Their] approach and product stood out to me above all else. The sales person met with me in person and went over all the options. He answered all my questions and provided options I hadn't thought of. ... I was glad the installers were employees and not contractors. The install of my door was excellent. The stain finisher (she probably has a different title) was an artist in blending the threshold to my wood floor. My door is beautiful, secure, and I now have a cozy living room because of the seal."
Deb N. - Entry door replacement - February 2025, via Google
Installation and Service
"Exceptional customer service. We had a small problem with one of our new windows. The manufacturer didn't want to address the problem. [Gravina's Window Center of Littleton®] escalated the problem and I ended up with a new [window]. I strongly recommend them as the best window replacement company in Denver."
James H. - Window replacement and warranty service - May 2026, via Google
"They told us everything to expect, clearly gave us time lines and exceeded our expectations when they came for install! The install team was efficient, respectful of our home and cleaned up everything each day."
Lauren S. - Windows and doors - August 2026, via Google
"Christian arrived promptly to replace a vinyl strip on our window casing. ... We are very pleased with the product and the service."
Judy and Harold W. - Service visit - November 2026, via Google
"Prompt, polite response on a service issue."
Gary J. - Service visit - October 2026, via Google
More Reviews
Why Colorado Homeowners Choose Us
Replacing windows or doors involves more than selecting a product. Homeowners need a company that evaluates the existing openings, explains the available options, installs the products correctly, and remains available after the project is complete.
Gravina's Window Center of Littleton® is a family-owned company serving Colorado homeowners since 1973. As Colorado's oldest authorized Infinity by Marvin® dealer, we bring more than five decades of experience to projects involving:
- Replacement windows and patio doors
- Entry doors
- Difficult openings and oversized window installations
Our window and door projects are completed by in-house installation crews and backed by a lifetime workmanship warranty. Homeowners also have access to a dedicated service department after installation.
The reviews on this page reflect the complete customer experience, from the initial consultation and product selection through installation, cleanup, and follow-up service.
The Window Matters. The Install Is the Difference.
Infinity by Marvin® replacement windows are made with Ultrex® fiberglass, but the product is only one part of a successful replacement project. How the window is measured, fitted, sealed, and finished also affects how the completed installation looks and performs.
- Accurate measurements and proper fit
- Careful interior and exterior sealing
- Clean interior and exterior finishing
- Jobsite protection throughout the project
Because our window and door installations are completed by in-house crews rather than handed off to unknown subcontractors, Gravina's Window Center of Littleton remains responsible for the work from the initial measurements through installation, final walkthrough, and service after the project is complete.
Customer reviews frequently mention the professionalism of the installers, communication throughout the project, care taken inside the home, cleanup, and attention to the finished work. Those details are why we believe the window matters, and the install is the difference.
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