Nex-Gen Windows & Doors

We wanted to keep the existing wrought iron doors on the front double-entry, but to do so, we needed to order CUSTOM doors. We were told it was doable so we proceeded to order custom energy efficient doors.

When the doors arrived with the installers, there was mass confusion! No one knew how to install our wrought iron doors! Angelo Martinez, Project Manager, was contacted by the installers and boy-oh-boy, he was our saving grace!!

He quickly arrived at our home and was able to resolve the situation for the installers. He devised a plan of action, for the installers, and they immediately set-about following his instructions.

They completed the installation within the allotted time-frame and without a hitch thanks to Angelo Martinez! He is knowledgeable, professional, customer oriented and all around nice guy! Good work NEX-GEN and thank...

Nex Gen installed a front door for us. We were very pleased at the quality of the product, workmanship, and professionalism.

We have had a GREAT experience with Nex-Gen. Ted Rajewski worked great with us getting us new windows (14!) for our house. We made a BIG mistake and went with someone different a couple years ago for three windows and BOY - Nex-Gen window quality is so much better. Installation was smooth, great communication. All of our interactions with all of their staff, sales, measuring and installers and final inspection was great. We wish we had made the choice right the first time and sooner. Ted listened to our needs and did a great job working with us!

Wonderful Company! Highly recommend them and we have to our neighbors and our son! The staff was very nice, efficient & skilled! They protected our surroundings & cleaned up very well after the job was done. They made sure we were happy! A foreman came by to make sure all was tip top. I finally got my garden window and I’m a happy wife, happy life with view of beautiful Rockies!

Great windows and amazing employees.

What a great company! We had the best experience with Nex-Gen in their replacing some windows for us. Our project seemed to come with a couple of challenges and we could not have had a better outcome! Ted Rajewski was our sales rep who came to look at what we needed. He has a wealth of experience and was confident in a great outcome. We had some additional wood around the interior of the old windows (three windows) for attaching our wood shutters. We wondered if that wood needed to come out for the install. Ted assured us that if that was needed, they would put it all back together and it would look the same. As it turned out, the installers did the job without removing the wood at all! Then there was our old garden window over our kitchen sink, for which we chose an awning window. My concern was we would lose a lot of depth on the interior window sill. Tony, our measuring tech from...

After mixup on initial bid process, all went well. Nex-Gen worked around our schedule, crew was on time, on task, pleasant to have “invade” our home, accommodating, polite, knowledgeable, careful and neat. Crew leader Robert continually checked that we were satisfied at every step. He did a couple of extra “fix ups” in our window openings. The job by nature is messy but they did a complete cleanup. Project Manager, Joe Martinez, checked several times, and reported my concerns with the product to Marvin rep. He also advised on finishing the windows (we will seal the ultrex& wood before Nex-Gen returns to fill/caulk seams). He assured us that even though we accepted the finished installation, if we note additional items, Nex-Gen will return and address those concerns. Although we have some concerns with the quality of the Marvin finish work, we are pleased with our...

A good experience from purchase to installation a professional job well done

Superior product and Joe was a wonderful project manager and his crews really know what they are doing. Thank you, Joe and crew. I would have given 5 stars but there were some glitches in early communication with my install, but they were handled quite well.

Mike did a great job. Would recommend Mike and Next Gen

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.

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!

The ordering process and installation was smooth and easy.