Fort Collins Window Replacement

You're in the Right Place

Most of our clients come to us with little to no experience with replacement 

windows. We understand that this is a process most homeowners will only have 

to complete once or twice in their lives so you need to work with a company you 

can trust. Our first priority is to honor that trust by providing: 

Our first priority is to honor that trust by providing: 

We aim to empower our customers to know they are making the right choice by providing as much insight and transparency as possible. Continue reading to learn more about the process and to see why Nex-Gen Windows and Doors is the best fit for your next window replacement project.

Schedule Your Call With A Nex-Gen Expert

& Receive Your Estimate & Timeline Within 24 Hours

Beautiful Designs

Many window manufacturers will argue that you have to sacrifice aesthetics in order to prioritize the quality and efficiency of your replacement windows but we’re here to tell you that’s just not the case. 

We understand that beautifully designed windows not only improve the look and feel of your home, but offer the added benefits of increasing both curb appeal and resale value. 

Our design team is uniquely qualified to help you find the style of window that captures your creative vision — regardless of how unique your needs might be. Whether you have specific HOA requirements, live in a historic district, or are building a custom home, we’re equipped to help you meet those specific parameters.


Choose from a variety of window glass, colors, screens, and hardware options. For more details on what options may be available to you, click below to learn more. 

Are you ready to see our design team in action?

Click below to tell us a little about your project and to schedule your free design consultation. 

Superior Products

There are several factors to consider when selecting new windows. Materials, durability, efficiency, and maintenance are just a few variables which should be taken into account — especially here in Colorado where extreme weather conditions, harsh UV exposure, and hail are a common occurrence. 


This is why we stress the importance of investing in products which have been proven to last. As a platinum retailer of Infinity® from Marvin® replacement windows, we place so much pride in the quality of our products that we go above and beyond the manufacturer’s 3-5 year warranty to provide a warranty which extends as long as you own your house. 

Along with an extended warranty, here’s what you can expect from your new Marvin windows: 

Schedule a free consultation to learn more about Infinity® from Marvin® or to price out your next windows replacement project.

Our design team will assess the health of your current windows to find what specific benefits you can expect by choosing to work with Marvin products.


While many build their businesses solely on the reputation of the products they provide, we at Nex-Gen Windows and Doors understand that the effectiveness of your windows relies on more than just the windows themselves. 

It is estimated that

65% of service-related issues involving prematurely failed windows are related to improper installation

This means that you could unknowingly invest in quality windows only to find that the installation was less than effective, therefore significantly lowering the life of your windows and your return on investment. 


We’ve heard countless stories of competitors who installed windows using shortcuts, caused unnecessary damages, or left a mess behind.

Our job is not over until your windows are properly installed, your space is properly cleaned, and you confirm that we have met or exceeded your expectations.

Our Promise to You

What immediately sets us apart from our competitors is our commitment to:


Follow best practices

1 (1)

Not cut corners on installation costs

1 (2)

Use proper 

flashing methods

1 (3)

Prep the space to avoid damage to your property

1 (5)

Clean any mess both inside and outside your home

Ready to learn more?

Contact us today with any questions related to our products or installation process.

Meet the Team

Learn more about the Nex-Gen family and meet the members of your next install team.