Fort Collins (970) 744-6762
Colorado Springs (719) 309-3779

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Replacement Home Doors



When taking on a replacement project, there are many important performance and maintenance considerations. Nex-Gen products offer high-end performance so you won’t have to worry about incurring more maintenance costs.  They’re designed to be durable and strong as well as easy to operate and clean.

You get everything you’re looking for in a Nex-Gen door, from state-of-the-art doors made with Ultrex® fiberglass material to sliding patio doors, the benchmark in the industry for style and hassle-free operation. The hinged swinging patio doors are not only made to perform with style and beauty, but also to make your entryway functional with a contemporary or traditional design.

Nex-Gen home and entry doors offer you much more than traditional doors. You get total value for your money backed by performance, superior materials, reliability and expertise as well as customized design. Nex-Gen Infinity doors are no doubt the number one doors in the industry.



Ultrex® Infinity fiberglass is a superior material that is used to make replacement doors and windows that are strong, durable, low expansion, and low maintenance. These doors are built to incorporate traditional wood designs and provide modern features that are more appealing.


Infinity products from Nex-Gen are made for homeowners looking for traditional designs that are high quality, low maintenance, and durable. Infinity Ultrex® fiberglass is made to withstand harsh outdoor conditions with low thermal expansion rates that keep the doors and windows airtight, reducing the risk of cracks when temperatures rise or fall.


Nex-Gen replacement doors are made by experts blending classic and contemporary designs. The wooden features give a traditional appearance while the Ultrex® fiberglass provides a modern feature that is easy to clean and effortless to operate. All these features combined give you a replacement door that is durable and trendy.


Using Nex-Gen products in your replacement project puts your mind at ease. The experts will visit your home and assess the replacement project to ensure that you will only get the products that are most suitable for your home. Nex-Gen Home Exteriors has an exclusive retailer network all over the world, including Fort Collins, Colorado, that will make the experience hassle free and successful.


Nex-Gen doors and windows are highly rated in the market and meet ENERGY STAR® energy efficiency guidelines. The strong DP rating assures you that they can withstand pressure and remain weather tight. The low U-factor is also an indication that the doors can prevent heat from escaping your home. The hallmark certification provides additional proof of the high quality of Nex-Gen products. Not to mention, the doors require low maintenance.


I called NexGen for a quote for a new storm/security door. The sales consultant, Ted arrived in a timely manner. After looking at our current door, he said we really didn’t need a new door. Our door does need to be serviced. Nice to have an honest company to call on. Thanks Ted.

Rhonda P.

Door Replacement in Fort Collins & Colorado Springs, CO

Nex-Gen Windows and Doors is proud to offer front entry and patio door products from ProVia and Infinity from Marvin. You can expect exceptional value from these top brands, which deliver superior performance, reliability, and customized design options to suit the needs of your Fort Collins home.

Learn more about the door replacement process with a free, no-obligation estimate. Simply contact us at (970) 744-6762 to get started.

Door Replacement Options

You have many important considerations to make when embarking on the door replacement process. What style and material will you choose? How will you ensure that the product you install remains durable, beautiful, and reliable for years to come?

Nex-Gen takes the guesswork out of replacing your entry and patio doors by offering only the very best products from two of today’s premier residential door brands—ProVia and Infinity from Marvin. Take a look at our options to help you decide if they’re right for your Fort Collins home.

ProVia Entry Doors

Your entry door is the first thing guests see when they approach your home. It’s also the last thing they see when they leave. Stylish designs from ProVia let you customize the appearance of your front door to meet your aesthetic and privacy preferences.

Your front door is also the biggest obstacle standing in the way of intruders. Superior locking mechanisms and durable construction make fiberglass entry doors from ProVia more secure than traditional wood doors.

You also rely on your entry door to keep out the elements. Rest assured that everything from the hinges to the polyurethane core of ProVia doors is designed to improve energy efficiency.

Infinity Sliding Patio Doors

The traditional sliding patio door is an ever-popular choice for Fort Collins homeowners. This style is versatile, space-saving, and easy to operate. Infinity from Marvin offers two sliding door options:

  • Sliding patio doors made from Ultrex® fiberglass replace builder-grade vinyl patio doors.
  • Sliding French doors made from Ultrex® fiberglass convert an existing inswing door to a sliding door while maintaining the traditional look of a swinging door.

Our door installation experts can help you decide which sliding door option is right for your needs.

Infinity Inswing Patio Doors

To create a grand, sweeping entrance to your backyard, consider an inswing patio door. As with Infinity sliding doors, these are made from durable Ultrex® for the ultimate performance and quality. Fully customizable sizes, colors, and shapes lend the perfect appearance to your home, whether you prefer a classical, contemporary, or rustic design. Expect the installation to improve your home’s energy efficiency and provide a seamless transition to the outdoor living space.

Why Choose Nex-Gen for Door Replacement in Fort Collins?

At Nex-Gen, we are dedicated to providing better products, better service. We understand that investing in new doors can feel overwhelming, so we’re here to give you all the information you need to make the right decision. Our goal is to exceed your expectations by helping you customize a statement entry door or smoothly operating patio door to fit your home, family, and budget.

When you replace your entry or patio door, you want it to last a lifetime. Our Peace of Mind Protection Warranty guarantees exactly that. If you have any problems regarding the product or workmanship of your entry or patio door, 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 your 100% satisfaction!

Schedule Door Installation in Fort Collins, CO

The professionals at Nex-Gen are here to guide and support you in your selection of a high-quality replacement door. We stand behind our products and pledge never to leave you with an unresolved problem. If anything doesn’t meet your expectations, let us know, and we’ll work to set things right!

When you’re ready to begin your door replacement project, please contact Nex-Gen at (970) 744-6762, and we will provide you with a free, no-obligation estimate.

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