Nex-Gen Windows & Doors

Purchased five Infinity by Marvin windows for the second level of our home. The quality is far superior to other big name brands (ones we are replacing), and at a surprisingly competitive price. These puppies are designed to last 20 yrs in Colorado's extreme weather, highly energy efficient, noise reducing, and aesthetically pleasing. Installation was top-notch by skilled experts. In addition to fine products, Nex-Gen offers stellar customer service. After an order glitch, staff have gone the extra mile to ensure this job was done right and to our satisfaction. Can't speak highly enough; don't waste your time looking elsewhere. This is the best window company in Northern Colorado!

Great windows and installation! Would highly recommend!

Got new windows. Great product and great customer service. So happy with everything.

We had NexGen install five Infinity by Marvin windows. We were very happy with the performance of the windows and the great care taken during the installation. This year we are having another four Infinity by Marvin windows installed by NexGen and we’re looking forward to the improved insulation that we know the windows will provide!

Best company to work with and the quality is top notch. I have used them since 2014 and I am now almost finished with my project. I would never want anyone else to do my windows

3 years later and we still love there windows and sliding glass door. Now I need an exterior and storm door and coming back to Nex Gen. Kevin, Broomfield.

Great team to work with. Quality windows with quality service.

2006 we moved into the home our dreams. A view of the Wind River Mountains from large windows. But the draft was unwanted.
Ted and Brent fixed that in short order. Installation was quick and precise.
The bonus was a friendship with two gentleman that have a genuine concern for others and the outcome of their work.
The windows and siding on our home looks great, just as it did the day they were installed 13 years later!
Thank you again Ted and Brent!

We recently had all the windows (20) in our home replaced by Nex-Gen. We have been very pleased with the whole process; and the windows are fantastic. The Marvin Ultrex windows are incredibly better than our old vinyl ones. We can already feel their energy efficiency in this summer heat! Everyone we worked with, from the owner Brent, sales rep Michael, Hunter in the showroom, and the installation crew of Rick, Manny, and Jake, did a great job for us -- and with respect, both for us and for our home. We highly recommend this company and the Marvin Ultrex windows. Thank you Nex-Gen!