Nex-Gen Windows & Doors

NexGen installed 8 full frame infinity by Marvin replacement windows in our home in Fort Collins. These windows replaced older single pane wood windows that were original to the house in 1968. The new windows are all casement windows and the worksmanship of the Marvin window is unbeatable at their price point. High quality hardware and high quality screens. I am very pleased with NexGen’s installers and finish work. They exceeded expectations. Would highly recommend NexGen to anyone needing replacement windows.

We purchased our windows from Nex--Gen in 2013. Brent and Ted were excellent to work with and our new windows have been awesome!
2023 we noticed that on some of the casement windows the seals were getting brittle.
Mainly the windows that are exposed to direct Colorado sun the longest.. Definitely not the windows fault. 10 years of direct Colorado sun is hard on everything.
I called Nex-Gen for warranty work, and they sent Mike out to fix them. Mike did an excellent job ! He replaced the seals on all of the casement windows. Our windows are like new again !
I highly recommend Nex-Gen and Mike.

You won't be disappointed in the product and service!

We looked at 4 different companies for our door install. We had an old, unusual sliding door system and no doggie door. Nex-Gen (Teri, Eduardo, and Angelo) were awesome and helped us get a custom French door with built-in doggie door. The doors arrived earlier than expected and were installed quickly. Love our new doors! Will definitely use Nex-Gen again.

We couldn't be happier with our Nextgen Infinity windows. They are beautiful, easy to vent and clean and the installers were top-notch! This local company has wonderful customer service, so we are repeat customers.

I purchased a storm door from Nex-Gen. it was a very smooth transaction and it was a pleasure doing business with them. From the very beginning and on through to the installation everyone was very customer oriented and professional. I will do business with them again and I highly recommend them.
Andy Grey

This time we had one window replaced. Last job we had 8 windows replaced. There were different instances & both times they did a great job. Install was good & cleanup was good too. They were very courteous & helpful. Our sales rep was Ted Rajewski & he was great at his job, very nice guy! I would definitely hire them again for future work. Thanks to all!🎄

Nex-Gen installed several windows and two doors-including an oversized patio door. Several windows were a special challenge as they faced open space with a high hillside drop off. I worried it would be impossible to replace them correctly. Nex-Gen worked hard to get it right and did a perfect job. From start to finish, the customer service and communication was excellent. Justin, Neil, and Roberto were fantastic to work with. Their background in construction was a huge help when figuring out what needed to be done. We felt respected and that they were committed to recommending only what was best for our situation. Roberto and the installation crew also did great work. Everything was placed and sealed perfectly with a beautiful result. We no longer worry about the high winds and sideways rain we sometimes get on the ridge leaking around our windows.
They respected our...

Very happy with the new windows, install done in two days with good attention to detail. The team was very quality focused. Thanks for the hard work and support!