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At Nex-Gen Windows & Doors we are here to assist you in the window replacement process. We assess your situation and provide new window solutions that fall within your budget and complement the look and style of your home.

Our superior products are backed by warranties to protect your investment, and our competent, friendly staff specializes in providing a satisfying remodeling experience.


New windows do more than just increase comfort in Colorado homes.

Quality replacement windows are virtually maintenance-free. They boost your home’s curb appeal and add value when it’s time to sell. A more comfortable home, security in your investment, energy savings, increased resale value, and no maintenance: We call it peace of mind.


Enjoy peace of mind with one of the most secure products in the industry.

Curb Appeal

You’ll be the talk of the neighborhood with the purchase of your new Marvin windows!

Ease of Operation

No more struggling with sticky window slides or windows that simply won’t open. Experience the near effortless operation of your new Marvin windows.

Resale Value

Improve your resale value by adding one of the top products in the industry. Your home will be more appealing to potential buyers, both inside and out.

Energy Efficiency

Experience the joys and comfort of keeping the cool air in during the summer months and the cozy feel of keeping the warm air inside when the temperature drops.

Maintenance Free

Put your tools away and spend your time loving your new windows. No more worries about adjustments or defective parts.


Our Priorities Are Your Priorities. Installation Process Made Easy.

  • A Team You Can Trust

    Our Courteous Installation teams start the project off right from the initial meeting walk around. They discuss preparation, timeline and keep you informed as the progress of your  installation takes place. 
  • Our Priority is Safety

    During the Installation process our top priority is to  maintain protection during the removal and installation  process. Minimal disruption to your home and your day to day routine remain top of our list. Most projects can be completed with in 1-2 days.  
  • Complete Satisfaction

    A final walk-through to ensure your complete satisfaction. 




Colorado’s abundance of sunshine, extreme weather patterns, and sudden changes in temperature are tough on windows.

Our elevation doesn’t help. Sustained sun exposure at higher elevations exacerbates the conditions that cause windows to deteriorate.

Replacement windows are not the standard windows your builder installed when the house was built.

We discuss your options and guide you through the selection process to ensure you understand the importance of investing in the right replacement product for your situation.

Replacing your windows with today’s high-performing, energy-efficient windows creates a more comfortable home, with even temperatures and no drafty corners.

Energy-efficient windows are third-party certified to ensure their performance, and they typically result in lower utility bills.


According to HomeAdvisor, 25% of the costs for heating and cooling your home comes from the energy lost through your windows.

Carefully considering which type of window is right for your home could save you thousands of dollars in energy costs, while increasing the resale value of your home.

Also, independent market studies have noted that 65% of service-related issues involving prematurely failed windows are related to improper installation. This is due to:

  • Shortcuts during the installation of new or replacement windows
  • Low-cost faulty sealants
  • Improper flashing methods
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What are the best replacement windows for my home?

We’re making it easier for you to buy replacement windows and doors by sharing what to expect during your project. Learn more about how you can find the best window for your home.


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Window Replacement in Fort Collins & Colorado Springs, CO

Do you struggle with drafty rooms and high energy bills? Are your windows difficult to open or painted shut entirely? Nex-Gen Windows and Doors offers the services you need! Our goal is to help every homeowner across the Front Range love their windows like never before. Take advantage of fast, reliable window replacement in Fort Collins to enjoy the money-saving benefits of having efficient windows for years to come.

Get your window replacement project underway—contact Nex-Gen at (970) 517-3931 to request a free installation estimate.

Why Replace Your Windows? Comfort, Security & Peace of Mind With Nex-Gen

New windows benefit your Colorado home in numerous ways:

  • Improved security: With advanced locking mechanisms and optional impact-resistant glass, your replacement windows can give you peace of mind against a break-in.
  • Enhanced curb appeal: Turn heads with gorgeous replacement windows that enhance the architecture of your home. The interior will also be more beautiful, with streamlined frames and modern hardware.
  • Ease of operation: If you currently struggle with sticky, creaky windows, you’ll revel in sliding your new windows open nearly effortlessly.
  • Increased resale value: Replacing your windows before you sell your home may help you attract buyers and allow you to increase your asking price, recouping your investment in the process.
  • Energy efficiency: About 25% of your heating and cooling bills comes from the energy lost through inefficient windows. A window replacement in Fort Collins can cut your bills by thousands of dollars a year.
  • Home comfort: Ridding yourself of leaky windows doesn’t just slash your energy bills—it also keeps your home more comfortable in every season. Rooms remain a steadier temperature, and cold drafts become a thing of the past.
  • Low maintenance: Put your tools and cleaning supplies away—replacement windows from Nex-Gen are durable, fade-resistant, and virtually maintenance-free.

How to Choose Replacement Windows in Fort Collins

We know that replacing your windows can feel overwhelming at first. With so many options, it can be hard to know where to begin.

Nex-Gen makes it easy by offering high-quality Infinity from Marvin replacement windows. Expect unprecedented performance and exceptional aesthetics from this premier fiberglass window brand. Advanced materials and design details stand the test of time to benefit your home for many decades to come.

As an Infinity partner, Nex-Gen is a local window installation expert backed by this national brand, which is ranked #1 in customer satisfaction. We are pleased to simplify the window replacement process by pointing you toward some of the best products available anywhere.

The window styles available from Infinity include:

Why Choose Nex-Gen to Replace Your Windows?

As an experienced window installer in Fort Collins, we know we can exceed your expectations. We have decades of combined experience helping your friends and neighbors across the Front Range experience what it’s like to truly love their windows. We’re not just another big window company—we care about your experience and won’t ever leave you with an unresolved issue.

You want your replacement windows to last a lifetime, and with Infinity from Marvin products installed by our certified team, that’s just what you get. Our Peace of Mind Protection Warranty means that if you have any problems regarding the product or workmanship of your windows, we will fix them free of charge for as long as you own your home. It’s just another way we show our commitment to customer satisfaction!

Schedule Window Replacement in Fort Collins, CO

At Nex-Gen, we pledge to guide and support you in your selection of high-quality windows. From window shape and size to glass options and hardware, we’ll make sure every detail is just right. The extensive Infinity from Marvin product line ensures you can find the precise windows you’re looking for.

To get your window replacement project underway, please contact Nex-Gen at (970) 517-3931 to request a free, no-obligation estimate today.

Read More +

The vinyl windows in our townhouse were 20 years old and showing signs of their age. We contacted several companies for bids. Some of the presentations were really long. We really appreciated Ted’s selling style of letting the product speak for itself. He didn’t waste our time. His pitch was informative and very low pressure. I’m so happy we chose to go with Brent and his team.

I dreaded the installation process and the cleanup afterwards. My husband was home when the windows were installed. I couldn’t believe it when I got home from work and the windows were in and there was no mess! I would not have known the installers had come if it weren’t for our beautiful new windows. The company is very responsive and workmanship was outstanding. I highly recommend Nex-Gen Home Exteriors for window replacements!

Improving your home, protecting your investment