Nex-Gen Windows & Doors

Mike did a great job. Would recommend Mike and Next Gen Read more >

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. Read more >

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 Read more >

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!! Read more >

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. Read more >

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! Read more >

Their products are excellent. Installation was easy with no hassle. Read more >

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. Read more >

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. Read more >

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

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. Read more >

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. Read more >

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 Read more >

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!🎄 Read more >

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... Read more >

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! Read more >

The ordering process and installation was smooth and easy. Read more >

After purchasing our home 2 years ago, we knew most of the windows needed replacing. Then the hail came, so we bit the bullet and decided to replace all 15 windows and the patio door as well. We started our homework and research and came up with 4 different companies to have come and show us their product.
As a daughter of a Sears salesman during years of 1970 to 2002, I use to watch him sell appliances to every walk of life. He was one of the few salesmen that tried to sell you what YOU wanted and could afford, not what THEY wanted him to sell you. And he was honest. Still a salesman, but honest. This is what I found in Ted Rajewski. He was efficient, smart and honest.
Everyone from Janice, to Angelo to gentleman that came to measure the windows to the installers. They were all very, very easy to communicate and talk with, which meant things were done efficiently and... Read more >

We received excellent service in replacing two large windows in our house. Measurement was expertly done and the windows were delivered on time. The price was reasonable. The installation crew were prompt and both the installation and its supervision excellent. We know because the weather turned really cold so we knew for sure. We have also had a followup visit. This is a local business so I know I can contact them for any additional followup I want. Read more >

Their windows appear to be good units. Initially, we had trouble with drainage on slider windows that was eventually remedied, but it took a number of visits to achieve a solution. In the end, it was determined to be a manufacturer-caused issue that once analyzed, was easily remedied. We had damage from a bad hail storm and they lived up to their warranty policy with replacement/repair. Read more >

I would not hesitate to recommend this company. Ted Rajewski went above and beyond to help me design and choose a new front door! He was prompt in responding to my texts and came to my home more than once to make sure I was comfortable with my decision. He was professional, knowledgable and friendly. As a customer I was listened to and valued. Read more >

Several years ago, Nex-Gen installed Marvin windows in our home. We were extremely pleased with the care and professionalism of the team. Recently, we had an older Marvin patio door with a slight problem. We contacted Nex-Gen. Cari, the receptionist, was very nice. Mike called to set up an appointment to look at the patio door. Again, we were very pleased with the service provided. Read more >

We reached out about replacing our windows. We had other quotes but felt pressured and that they weren't listening to what we wanted. Then Ted came over, listened to what we wanted, quoted what we wanted and didn't pressure us into more. Fast forward a couple of months and we were ready to move forward. Ted came back, answered our questions, never pressured us and never over sold us! We are so happy to be working with Ted and NexGen windows! We highly recommend them!!

Windows were installed and I cannot recommend them enough!! The installation was quick and went smoothly. Neil, Shane and Shanoin (sp?) were great with the installation!! Read more >

Fast, high quality product. Would recommend Nex-Gen to anyone. Read more >

We had a sliding glass door replaced this summer and we are so happy with how it turned out. They showed up on time and got right to work. There were 3 guys. It did not take them long at all. You could tell they all had their specialties and worked very well together. It was impressive how smooth it went and we love our new door! I would highly recommend this company. Read more >

Good quality products and quick work during the installation. Personnel were responsive to concerns. Scheduling the installation was a bit challenging. Read more >

Years ago i installed replacement windows fro, NEX-GEN. So when I needed a new storm and main front door, i called them. After talking with other companies, I chose Nex-Gen. I am very pleased. The doors are tight, strong, substantial and easy to open and close. They feel and look great! The installers were pleasant and did a good job. Read more >