Welcome to Great Lakes Window®! We’re one of the nation’s oldest manufacturers of all-vinyl custom replacement windows and patio doors. And in the window business you don’t last long by resting on your laurels or creating inferior products.

But what is it exactly that makes our windows such a great value? And is it really worth it to replace your windows?

This site answers those questions. Take a look around. While you’re doing your window shopping and checking out our product lines, be sure to learn the benefits of custom replacement windows. See which window styles suit your home. Discover how the quality of our windows has earned the certifications of prestigious independent organizations.

We’ve provided plenty of answers to window questions, and never hesitate to contact us for anything you want to know more about. We’re glad you’re here!