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Did you know?

New windows offer a significant return per dollar invested that you can make to the construction of your home? Learn more about our best replacement windows that meet your needs.


Doors you will be proud to walk through!

We offer the best replacement doors including: standard entry doors, sliding doors, French doors and many others.


Give your home a fresh new look.

Upgrading your home’s siding can increase energy efficiency and decrease outside noise. Find out more about which type of siding is the best fit for your home.

Better Products

  • Infinity by Marvin Replacement Windows and Doors
  • ProVia Replacement Doors

Better Services

  • Infinity by Marvin Replacement Windows and Doors
  • ProVia Replacement Doors

Better Warranty

  • Infinity by Marvin Replacement Windows and Doors
  • ProVia Replacement Doors

Proud to be Locally Owned and Backed by a National Brand

“This is kind of a one time opportunity. We want to make sure everything is right and our customers are glad they made that decision.”

Brent Rajewski
Owner – Nex-Gen Home Exteriors

Lead safe EPA
Energy Star (2000x2000)

Wow! What a great team of people.

Jason led us through the process of replacing 18 windows on our 25 year old home. We knew with where we live that we didn’t want vinyl or wood windows due to the extreme weather conditions so we opted to check out Marvin windows. We couldn’t be happier. The team that measured and installed were professional and courteous. We look forward to working with Next-Gen in the future!

35 Years Experience

Lifetime Installation Guarantee

Fully Licensed & Insured

0% Financing Available

Get Your Free Consultation Today

“Serving Northern Colorado From Fort Collins to Denver, Estes Park to Greeley – We’re here for you.”

Family Owned and Operated

Nex Gen Home Exteriors in Loveland, CO is a family owned and operated business with a commitment to excellence for each and every customer. With over 35 years of experience in the window and door industry, we have learned the secret of setting ourselves apart from every other company.

We recognize the importance of offering the highest quality, time-proven, and trusted brands of leading-edge products at competitive prices. Honestly, that’s the easy part! Because everyone knows that a great window or door is worth nothing if it’s not upheld by expert installation and outstanding customer service.

Nex-Gen Home Exteriors is the trusted vendor of Infinity from Marvin fiberglass replacement windows and doors. We serve the Northern Colorado and Southern Wyoming regions. The trusted authority of Infinity From Marvin fiberglass replacement windows, (the Marvin Infinity windows and doors line for Replacement), for Northern Colorado and Southern Wyoming.

I highly recommend Nex-Gen Home Exteriors for window replacements!

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. 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.

Home Improvement: Windows, Doors, Siding Replacement & Installation