Nex-Gen Windows & Doors

Mike did a great job on the repair. Highly recommend. Read more >

Neil and Roberto's crew did a great job with the installation on our new Provia door. They were on time, courteous, and communicated throughout the process as well. Justin, the sales consultant, also did a great job. He was upfront, clear, and friendly while going through the design process, getting pricing, and choosing a door company. On top of that, the door came sooner than expected and looks amazing! Read more >

We love our new windows and door. The only part we didn’t enjoy was the installation process. The guys left nails on our roof which we asked them to clean up, but noticed they were still there after they left. Also they use dirty floor covers and walked through my home I got a metal splinter from the dirty floor covers which was very difficult to remove. Also the effort they take to protect your belongings is mediocre at best. We had to clean everything because there was dust covering everything once they were finished. Overall, happy with the windows and other interactions, but please do better with your installs. Read more >

We replaced our upstairs windows with Marvin 7 years ago. Ted did a great job of showing and explaining the Marvin windows. We are now going to replace all our main level windows, ( 8 windows) with Marvin. We are once again very pleased with Ted and the Nex-Gen staff. Read more >

I highly recommend Nex-Gen Window & Doors! We've worked with Ted over three different projects to replace all of our windows and patio door. The Marvin Infinity window is awesome; a huge improvement over our home's original windows! For a quality product, professional service, and great value, Nex-Gen is great! Read more >

We put Marvin windows in our prior home and loved them. When we found ourselves needing new windows in our current home we knew we wanted to get a quote from Nex-Gen. We knew it was going to be a costly but necessary venture. We got the quote and ordered the windows in October. The window openings were measured multiple times. By the beginning of December the windows arrived and were expertly installed in 2 1/2 days. (This was over 20 windows plus creating a large sliding door where a window had been.) I can’t say enough good things about Nex-Gen. By the way, Nex-Gen was significantly less costly than Anderson and despite repeated attempts, Pella would never return our calls and e-mails. Read more >

After getting several quotes for windows, buying some not-so-great ones from a place who did a TERRIBLE job and doesn’t follow up or provide any customer service, we decided to do a lot more research about windows and companies here in Colorado. After getting more quotes and doing a TON of research on the best windows for the extreme weather, we found Marvin Infinity windows to be the best and NexGen has an unbeatable warranty. It is truly lifetime (there is no asterisk) and can even be transferred if you sell your home. Neil Horn was great in the sales process, he came to the house and listened to our needs and worked within our budget and was very honest about what would be best for us and our home. We also met at the store and looked at all the windows and selected those that would be the best for us. It was so nice to have the hands-on experience. Neil also kept us updated on the... Read more >

I recently had 5 windows and 3 sliding glass doors replaced by Nex-gen. I could not be happier with the service and products they provided. Ted came out and offered some changes to an existing kitchen window that turned out beautifully. Every person I worked with was professional, kind and very respectful of my property. I will never hesitate to recommend this company. Read more >

We just had a great experience with NextGen replacing 30 very old windows, and would highly recommend this company.

I was impressed with NexGen’s approach of inserting new windows instead of opting for a complete replacement, which ended up saving me money.

They also removed a window, ensuring that the interior was repaired and the siding replaced. The end result was flawless, as if the window had never been there.

I appreciated their attention to detail on every window, as they took the extra effort of painting all the trim, giving the windows a brand new look.

Throughout the entire process, my contacts at NexGen Neil, Shane and Terry, were not only professional but also friendly and nice to talk to. I highly recommend their services. Read more >

Dan did exceptional with getting our windows ordered and was very thorough when explaining the details of the project. Robert Herrera was an excellent installer and came with a top-notch crew to complete the window replacement in my home. Also Neil was great and came by twice during the instal to ensure that we received exactly what we paid for. They also went through a final walk through and showed us how the windows operate and explained all the warranty information we needed to know. I would definitely recommend Nex-Gen windows to anyone who is looking for a quality window at a great price, I also would recommend Robert and his crew for any general contracting you need in your home or building. Definitely using them again and requesting this crew by name. Thanks for your hard work and quality installation. Read more >

We contacted Nex-Gen Windows and Doors about replacing several of our 37 year old casement windows as well as an entry door in early April 2023. We met with Steve (a Nex-Gen Sales Consultant) about our project. We were very impressed with the quality of the windows and doors, the myriad of options available to us, and the price.

We ordered our windows and door and were amazed how much earlier our purchase arrived than expected. We were able to schedule our installation about a week later.

The Team of Neil, Steve, Dustin, and Arthur arrived early on June 6, 2023, to perform the installation. I was quite surprised that the entire installation was completed by early afternoon.
Neil walked around with us to look at the installation of each window and our door to make sure we were
satisfied and to answer any questions we might have about the features... Read more >

Great communication, quality of the windows and installation were fantastic. Ruben and Neil were great! Read more >

Dustin and Arther did a great job with the window installation😊. Neil also did a great job of following up with his team and made sure I was happy with the windows Read more >

Love Neil and Shane. The windows are great looked at Anderson Champion and others and am extremely pleased Read more >

Love my new windows!
Roberto and his crew worked very hard and efficiently to get all 7 windows installed in one day. I really appreciate the attention to detail that Chris exercised with the custom staining, fix and touch up of the interior casing. It turned out perfect..
Neil is the MVP, following up during the project and a special trip when all was done to make sure we were completely satisfied. Thank you so much for my windows and good experience. Read more >

Everyone I dealt with at Nex-Gen was professional and dependable. The project went according to the timeframe they set and the estimated cost. Neil Horn kept me informed and kept up with scheduling and overseeing the project. Louis and his crew are true craftsmen and Louis was great at keeping me informed as well. I am so happy with my new space--light and airy but also more private. Read more >

Work was excellent and staff very courteous. Work by Neil and Roberto was especially good. Read more >

Was very happy with the project outcome and service quality. The team (Neil, Steve, Dustin, and Arthur) were professional, competent and courteous. I was kept well informed both before the crews arrival and during the project. The team insured that I was satisfied and my questions were answered. The project was completed in a timely manner. Top notch service and I would highly recommend. Read more >

I appreciate a contractor who is polite, professional, efficient, and treats my home with care. That’s the kind of service Neil, Mike and Dustin provided today. Thank you, NextGen! Read more >

We used Nex-Gen for replacing over 30 windows in our house. They were great to work with and incredibly responsive. The project manager was Neil Horn, Ruben was the installation team leader. They were polite and considerate. Ruben paid attention to detail and the house was left in the same condition as when this project was started. I highly recommend Marvin windows and this installation crew. Read more >

Neil Horn, our initial contact, was thorough, informative, highly professional. Dustin and Steve installed, again thorough, on time, informative. Great clean up too. We love the look and the energy tightness of the windows and doors Read more >

Ted, Neil and Edwardo were amazing to work with. Couldn’t be happier with the price, product, installation, and warranty! Will Highly recommend to friends and family! Read more >

Neil the design consultant, Roberto the lead installer and Dan the sales rep all were excellent to work with and the finished product is great. Read more >

Got a new entry door with Nex-Gen. Door came quick, with good communication along the way. Dustin and Neil were professional for the install. Read more >

The wait for the windows to be manufactured was quite long but they are really great. Neil Luis and team did a great job. They were neat, and a pleasure to work with. Read more >