Nex-Gen Windows & Doors

Great products and professional people Read more >

Everyone i have worked with at NexGen has been professional, courteous, responsive and the workmanship is top-notch. Will be reaching out to them to also get a quote for siding. Read more >

When replacing all of our windows, the company we were using could not change four windows into two long ones, saying they would be too big. Nexgen’s frames were stronger and they were able to make the two long windows, eliminating the 8” space between. It made a world of difference in our living room! We wish we had used Nexgen for all of our windows!!!!
Everyone at Nexgen has been terrific - from Ted, the sales person to the installers.
We now have another project so I immediately contacted Nexgen. Read more >

Had an issue with our door jamming and Mike came out and fixed it right up in about 15 minutes! Read more >

We love our new door. High quality fiberglass construction and the door is efficient at blocking heat, sunlight and sound. The installation was efficient and they did quality work. Very happy with our experience with NexGen so far! Read more >

NexGen replaced 3 windows in my patio home. The quality was what I was looking for in windows. The installers did a good job and left the inside and outside of the windows looking professional and well installed. Read more >

We’ve had our NexGen windows for about a year now. In the winter time when all of our other windows had condensation, the new ones didn’t. The product is excellent. We even saw a reduction in our heating bill. Ted is wonderful to work with. Highly recommend. Read more >

We had Nex-Gen install our Infinity windows some time back was very pleased with the service and love the windows. We had hail damage on the lower trim and needed repairs called and set a date for the work, Mike showed up at the set time and went to work. Very professional in his time and work,
They look just like new once more. Great windows and even better service. The quality of Infinity and the service from Nex-Gen was the best. Read more >

Thank you Nex-Gen! Ted was knowledgeable and friendly with helping us select the right windows and patio door for our house. The installation team was professional, along with giving attention to every detail. The new windows have really made our house stand out in the neighborhood, with neighbors stopping by to let us know how great the windows look. Thank you! Read more >

I love having working windows in my vintage home. Read more >

The Nex-Gen team did an amazing job. Everyone was professional caring. I got all my windows and front door replaced. I love how it makes everything look so much better. My trailer is staying cooler in the hot weather. I can't wait tell winter to see how much better things will be with keeping the cold out. Thank you for doing an awesome Job Read more >

We would recommend this company! They replaced all the windows in our home and it was a very easy process, from the initial meeting with Ted, who was very helpful and knowledgeable, through the installation. The install team was very good at their job and went above and beyond for us. There was a couple of glitches during this process, but everything was handled in a timely and professional manner. We love our new windows and could not be happier with our decision to use Nex-Gen. Read more >

Ted Rajewski and his crew were extremely professional, courteous, with thorough attention to detail. Ted was very helpful with window custom plan and helped prioritize windows needing the most attention. We absolutely love the quality and look of the windows! The window awning hardware makes the management of the windows very easy, and the interior and exterior finish a great match for a custom home. We have begun phase two for continuing the window replacements and are looking forward to the improved comfort and energy efficiency which we immediately recognized with the first window project. We highly recommend NexGen Windows and Doors Ft. Collins!!!! Read more >

Fantastic work done by Nex-Gen. I did quite a but of research before purchasing and they had a great price for the work i wanted to get done. Workmanship was top notch and will use them again if i need to have some work done on the house!! Thank you!! Read more >

Nexgen did a great job with our window replacement. We replaced every window in our home down to the studs. The Marvin energy efficient windows are top notch and have been worth every penny. Read more >

I had these guys install a sliding glass door. It was spring so couple weather glitches. They got the job done and their attention to detail was amazing. Great customer service. Always took care of any details that needed to be done. If I have any other window work that needs to be done I will be calling these guys. Read more >

A few years ago, Nex-Gen installed double-hung windows for our sunroom and it's really made the space so enjoyable. Good quality windows for a good value, and very professional service. It's made such a difference we've decided to use them again to replace our leaky aluminum basement windows with vinyl. Really looking forward to the improvement. Read more >

Ted did a great job helping us choose the right windows for our home in Johnstown. Wendy did a great job communicating installation dates, James and Dave did a great job with the installation. Good craftsmen that complemented the new windows and doors. Your first choice is to call Nex-Gen, they will follow up with your expectations. Read more >

These guys are simply amazing to work with. From the moment Ted came out to estimate our project, all the way through installation, they have been a class act. We replaced every opening in our home (20+ windows) with custom, ebony on ebony, Marvin Infinity windows. Brent, the owner made sure each step in the process was communicated and that we were comfortable with everything along the way. The installers were great guys too. They went out of their way to communicate their comings and going’s. We have kids and we were living in the home during install. They were very courteous and kind to our boys (even when my kids HAD to stick their fingers in the fresh black silicone...). We had such a great experience, we are now working on a siding project with them also. If you are looking for these types of services, stop looking, and give these guys a call. You will be in good hands.... Read more >

Though we desperately needed new doors on our patio due to years of damage from the heat and sun, I was hesitant to even start looking in to it as I thought the cost would be beyond what we wanted to invest. Clark convinced me to take a look at the Nex-Gen products and now we have 2 new doors. Everyone there was friendly and professional. Clark answered my 100s of questions and worked to find options until I had the products I wanted, an excellent price, and a finance plan to help me make the best choice to improve the value of our house. Read more >

This is a great business. They really went above and beyond!! Tom did a wonderful job coming in at the price I needed as a single mom! He wasn’t pressuring and was respectful of my budget. The installers were friendly and even went to Home Depot for touch up paint and made and printed new trim. They left the rooms cleaner than they were when they arrived! Love love love my new windows :) Read more >

We had a great experience with Nex-Gen from start to finish! Our salesperson, Ted, was so helpful and knowledgeable. The install crew was very efficient, replacing all of our windows and a patio door in less than two days. They were even kind enough enough to take their lunch break while our baby napped. We’re so happy with our windows, and we can feel the heat difference already! Read more >

Nex-Gen replaced our 34 year old kitchen window and patio door and we are very impressed with the quality of the Infinity products. Both the door and window glide smoothly and they look beautiful inside and out. We like the extra security the patio door provides and the kitchen window is very easy to remove for cleaning. The entire team at Nex-Gen has been exceptional to work with and ensured the installation was exactly as we requested. We highly recommend Nex-Gen Windows & Doors and have already placed an order for two more replacement windows. Read more >

3/8/21
we use nexgen again, still great and maintain good quality of their products and service.

Several of our builder graded windows badly need replacement in 2018. Since we were pretty new in Longmont. I went to home advisor looked for reliable brands and company for windows replacement. I had 9 interview set up at the time. NexGen was the only one stand out.( recommended by my neighbor ). From the sales representative Ted, very knowledgeable to their products and not intend to intimidate my decision making, to communicate with Hunter regarding setting up appointment for critical measurements and date for installation, to Rick to install the windows. The whole process was well organize and went smoothly. I was impressed and at ease we finally find a company we can rely on. Sure enough, this January, 5 more windows need replacement. I contacted Nex Gen , here... Read more >

The team at Nex Gen were great! Ted was a great salesmen, Shelby was super with the customer service side of things. Clark was great after the install, he came by after and inspected all the windows and doors, he noticed a small tear on one of the screens, the crew will come back out and take care of it, free of charge. The install crew were awesome, they showed up early, took care of the install, and our dogs did not get out while they were here. Overall a very great company, would recommend them anyone! Read more >

Nex-Gen did a great job with my sliding glass door replacement. I chose the Everwood finish so we could match our previous oak decor. The Marvin glass door is very solid and looks great. I loved being able to inspect all the hardware in Nex-Gen's showroom before our purchase. The work was very professional and the price was very good. As with any company, it does pay to inspect the work while it is in progress. I was able to have them fix a nit-picky concern during the install. Read more >

A major hailstorm damaged all the windows in our home so we needed our wood casement windows replaced. We were dreading this major undertaking. But our experience was amazingly pleasant with NexGen from beginning to the end. Everyone was very knowledgeable and helpful and the installers were professional, polite, and very thoughtful in every way. Our Marvin Infinity Windows have passed the test in every way. We highly recommend NexGen! Read more >

We got half of our windows done a few years back and they are all very personable and efficient. Marvin windows are great quality. We are hiring them again for a few more. Ted is wonderful! Read more >