I did extensive research for over three years and met with every significant window company in the Denver area before making my decision to go with Lifetime Windows and the Marvin Infinity windows. The Marvin windows are of high quality and the installation was done well with no issues and no need to come back to correct anything. I would highly recommend both the Marvin Infinity windows and the team from Lifetime Windows.

I will not hesitate to call Lifetime for any future siding/window needs and would *highly* recommend them based on their commitment to customer service.

Lifetime Windows was fantastic. The quality of the product and installation far exceeded our expectations. The staff were incredibly friendly and took pride in the work they did. They also ensured that we were happy with the installation that everything looked the way it should. It is absolutely amazing the difference new windows make in heating/cooling our home as well as a decrease in traffic sounds. We are thrilled with our purchase and would absolutely recommend this company to any interested in replacing windows at their home.

I had the Marvin 'Infinity' windows installed. They cost a bit more and the turn around time was a bit longer but well worth it. For the first time my bedrooms were comfortable in the winter and my heating bill was about a third less then this time last year. Installation was quick and clean. I went with the fiberglass frame over the vinyl because it just seemed like a better window. I am an architect so I know a good window when I see it.

Over the past five years we have been replacing the approximately 35 windows in our 27 year old house. We've interviewed 4 contractors and employed two of them, including Lifetime Windows and Siding. We are very pleased with all aspects of our experience with Lifetime Windows and Siding. We went with Marvin Infinity windows as these have been very good for us in other locations in the house and the installers did an excellent job of installing the new windows with new trim.

Lifetime Windows replaced 11 of our vinyl windows and installed the Marvin Infinity windows (fiberglass). We LOVE them! Now that winter has come we can really feel the difference -- no more drafts and rooms are much more comfortable. The windows look great, and low E is a plus. Rory was awesome, returned calls/texts right away. Highly recommend Lifetime Windows!