Nex-Gen Windows & Doors

Nex-Gen did an amazing job installing new windows. Everyone was so professional, courteous & they got the job done in great time. We love our new windows & will be back for more. We highly recommend Nex-Gen.

We replaced 11 windows a year and a half ago and today we are meeting with the best representative ever...Ted Rajewski.. as we are ready to replace more windows. I can't say enough about the windows..Marvin Infinity..they are fantastic! The installation was trouble free...no mess and the crew was so professional. We needed the inside trim touched up and they did that also. Everything went smoothly and our electric bill reflects a monthly savings of these very energy efficient windows. We have recommended Nex-Gen to several friends. Thank you! Steve, Ann and Cindy Taylor

I have worked with NexGen for several years replacing windows in my home, a sliding patio door and most recently, an entry door with a storm door. I absolutely love it!! They are the best to work with from start to finish. Installers were awesome!!

Nex-Gen is wonderful to work with. They do excellent work and take care of their customers. They have installed several Marvin Xfinity windows in our home and we are very happy with them.

We had Nex-Gen install windows in our basement several years ago. We love them so much that we are having them install the replacement windows upstairs too! Easy to work with, fairly priced and good product!

Their products are excellent. Installation was easy with no hassle.

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.