Nex-Gen Windows & Doors

Nex-Gen was great to work with! We replaced 25 windows and a door in our home and were very nervous about the process. Danielle and Ted were very informative and professional, and really put us at ease. We chose to go with the Marvin Infinity windows and immediately noticed a huge difference in the amount of heat and glare coming in. And they look beautiful! Rick and his installation crew did a fabulous job. They worked quickly, were courteous, cleaned up after themselves, and explained how to best operate and clean our new windows and door. We couldn’t be happier and would definitely recommend Nex-Gen if you’re in the market for replacement windows.

We searched a number of recommended businesses/firms to install 41 replacement windows/doors in our home in Loveland, CO. We found Nex-Gen Exteriors, a local business who sells the Marvin Infinity and Integrity line of windows.
The Customer Service from Nex-Gen is nothing short of outstanding. Replacing 41 windows and doors is a mega window project, and the product is outstanding in terms of isolation from the heat and bitter cold, high wind gusts, and the occasional bird strike on a window. The pultruded fiberglass frame material these windows and sliding doors are made of means no leaks due to expansion/contraction, since the frame material has the same expansion characteristics of the glass.
The installation project took over 3 weeks, plus follow ups for building new interior frames and the exterior trim into the siding. They also installed a new double front door from...

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!