Replacement Windows Company

Are you in the market for new and improved replacement windows? The experts at NESCOR are here to help. Since 1957, our replacement window installers have been designing and installing high-quality windows for homeowners throughout Connecticut and Massachusetts.

Along the way, we have earned accreditation with the Better Business Bureau and have successfully completed over 20,000 projects. Are you ready to start planning your project? Our replacement window company is just a phone call away!

Warranty Protection You Can Rely On

NESCOR is happy to stand behind our products and workmanship with the best warranties in the business!

Free Energy Assessment!

Learn more about your home and ways to help lower your energy bill

Expires 05/31/2022

20% Off with 0 Payments, 0 Interest until 2023

NESCOR’s simple financing options make it easier to budget for the home improvements you need!

Our Services

Comprehensive Window Installation Services

As your trusted vinyl replacement window installers, NESCOR will be by your side to make every step of your window project a breeze. For the past six decades, we’ve been perfecting our window installation services so we can better meet our customers’ needs.


What Our Customers Are Saying!

Read All Reviews
Jeff W.


Shad Turner, was super knowledgeable. Felt like I was talking to a friend not a salesman. He walked us through each and every step. I highway recommend NESCOR.More importantly, ask for Shad.

Window Experts

What Makes Our Window Experts Stand Out?