Infinity from Marvin Window Installation
in Fort Collins & Colorado Springs

in Fort Collins & Colorado Springs


In independent market studies, it has been noted that 65% of issues related to prematurely failed windows are caused by improper installation.


This is due to shortcuts during the installation of windows, low-cost faulty sealants, and improper flashing methods. There is something to be said for doing a job right the first time, and being able to put your name on it. Nex-Gen strives for quality over quantity and is constantly raising the bar in the window replacement industry. We live by the code: A product is only as good as the installation behind it.


Up to 2 Hrs.

Personalized consultation to determine the window and door products specifically for your home. We advise, but we want our customers to make the decision that’s best for their family.

7 Days

Our company will contact you within 7 business days of signing the contract. A certified critical measure technician will ensure each window and door is custom built to the exact specs of each opening.

4-6 Weeks

The Infinity from Marvin product is a custom built window and door solution. Due to this measure of quality, each window and door takes up to 6 weeks to build. Truly a product built for you and your home.

Upon Delivery

Our certified installation masters will contact you when your products are delivered. They will coordinate dates and times with you based on your project.

Based on Order

The installers arrive with all necessary equipment to complete your job to the highest of standards. The completion time will be based on the size and extent of your project.



We did all 39 windows in our home of 24 yrs. They look great! All customer service was excellent and the window crew great to work with, very knowledgeable (even made some quick fixes to a sticking or not shutting door for us) after they got tired of dealing with them!

They were very careful of garden plants and both the inside and outside look wonderful! We are very pleased and look forward to many years enjoying our new windows!

Lyn S.


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 to prematurely failed windows are related to improper installation. This is due to:

  • short cuts during the installation of new or replacement windows
  • low-cost faulty sealants
  • improper flashing methods

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.

Improving your home, protecting your investment

Windows Marvin by Infinity Installation

As a Marvin window dealer in Northern Colorado, Nex-Gen Windows and Doors is proud to carry products from the Infinity from Marvin line. These replacement windows are made from Ultrex® fiberglass, a material designed to last a lifetime. With numerous operating styles and customization options to choose from, you’re sure to find the perfect window replacements for your Fort Collins home.

For a free quote—or to schedule Infinity from Marvin window installation along the Front Range—please contact Nex-Gen.

When To Replace Your Windows

A window replacement can be a significant investment, but it can improve the beauty, comfort, and performance of your home, while reducing your energy costs. At Nex-Gen Windows and Doors, we recommend replacing your windows if:

  • They use single-pane glass
  • The glass is cracked or improperly sealed
  • You have drafts or high heating costs
  • There is severe water or weather damage
  • The frames are warped, bowed, or will not open

Ready to improve the looks and comfort of your Fort Collins or Colorado Springs home? Contact us online to schedule a window installation today!

Features & Benefits of Infinity from Marvin Windows

You might be wondering if Infinity replacement windows are the best option for your home. Consider the features and benefits of this high-end product line to help you make your decision.

  • Durability and low maintenance: Marvin pioneered Ultrex fiberglass, which has been perfected over the past 20 years into the ideal window material. Unlike cheap window options, Ultrex fiberglass doesn’t sag, bow, crack, or degrade over time. It expands 87 percent less and is eight times stronger than vinyl. It also withstands harsh UV rays, rain, hail, and temperature extremes common along the Front Range.
  • Beauty: Infinity from Marvin windows are gorgeous inside and out. The optional EverWood interior provides the look and feel of real wood windows without the maintenance. Thanks to the incredible strength of Ultrex fiberglass, Infinity windows have a thin frame profile to give you a broader view of the great outdoors. Then, the impeccable acrylic finish is three times thicker than competing brands to resist chipping, denting, and peeling.
  • Efficiency: With an insulating frame, better weather-tight seal, and high-performance glass, Infinity windows are some of the most efficient products on the market. Expect lower energy bills and better home comfort for years to come.
  • Customizability: With Infinity from Marvin, there’s no need to settle for a one-size-fits-all approach. Choose the window shapes, operating types, hardware, grille styles, glazing options, finishes, and screens that suit your home best.

Infinity from Marvin Window Installation Process

Replacement windows are only as good as the installation behind them. Case in point—an estimated 65 percent of premature window failure is due to improper installation. Some installers take shortcuts, using faulty, low-cost sealants or improper flashing methods that fail to stand the test of time.

At Nex-Gen, we do things differently. Our dedication to quality and customer satisfaction is apparent in our installation process:

  • Product consultation: We spend up to two hours meeting with you to determine the perfect windows for your home. We make suggestions, but the final selection is up to you.
  • Measurements: We will contact you within seven days of signing the contract to take precise measurements and place an order for your custom windows.
  • Custom product manufacture: Infinity from Marvin windows are custom-built to ensure quality and an exact fit. Each window takes four to six weeks to build.
  • Window delivery: We will contact you when your windows arrive to coordinate an installation date that works for you.
  • Window installation: Our certified installers will arrive at your home with all the tools and equipment needed to complete the job to your high expectations. The estimated completion time varies based on the size and extent of your project.

Infinity from Marvin windows come with a lifetime product warranty, and our expert window installers’ work is covered by a lifetime installation warranty. If there are any questions regarding the workmanship or installation quality of your windows, we will fix the problem for as long as you own your home. This level of coverage is unheard of from other brands and window installers in Northern Colorado.

Schedule Infinity from Marvin Window Installation in Fort Collins, CO

For more information about the Infinity from Marvin line, or to schedule a free, no-obligation estimate, please contact Nex-Gen.

We install replacement windows all along the Front Range, including Fort Collins, Loveland, Greeley, Longmont, and Cheyenne, as well as throughout the Colorado Springs area.