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Save a Window, Save a Tree
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Received an Innovative Commercialization Grant
from the U.S. Department of Energy in 1991
Save Your Windows While Keeping Your Original Wood Frames

An Alternative in Window Replacement & Restoration

Do you love the look of your windows, but hate how drafty and inefficient they are? Do you want to save money on your energy bills, but can't stand the way "new" windows change the look of your house? Finally, there is a solution to your problems with Bi-Glass Systems. The Bi-Glass window restoration process has proven successful on thousands of windows. From Victorian bent glass windows and period glass to the more contemporary styles of the 1920s through the 1970s, you can save your old wood windows and save energy with the Bi-Glass System. Our patented process allows homeowners the option of keeping their existing windows and upgrading the single pane to double-pane, insulated glass. We offer a variety of weatherstripping, jambliner/balance systems, historic hardware, and restoration glass in the insulated panels, which is ideal for those who love the look of antique wavy glass.

Tall Windows

Sell and install this innovative window replacement system by becoming a Bi-Glass Systems dealer. You'll reap many benefits as a Bi-Glass dealer, while providing homeowners with a unique and great alternative to traditional window replacement systems.

Become a Bi-Glass Dealer

Bi-Glass System

The Bi-Glass System is a double-pane, insulated glass that replaces old, single-pane glass in windows. Not only does it maintain an older home's beautiful appearance, but it also upgrades the windows' energy efficiency at a lower price than new wood windows.

What Is Bi-Glass?


Make sure you're well aware of all the different terms involved with window replacement and restoration. We offer a convenient glossary of terms for customers to refer to when installing new double-pane, insulated glass in their windows. Please read through our terms.

Glossary of Terms

Learn more about Bi-Glass Systems, an environmental technology breakthrough for the window industry.
(800) 729-0742

About Us

Bi-Glass Systems, based in Boston, Massachusetts, has been in business since 1985. Our company is proud to offer a great energy and money-saving option for homeowners with our replacement system for single-pane glass windows. We replace your old, single-pane glass with double-pane glass, which preserves the original integrity of the wood, while reducing energy loss and saving you money on your monthly utility bills. Contact us to learn more about our window replacement and restoration system.

Learn More About the Technical Details of Bi-Glass Systems Get Answers to Your Frequently Asked Questions Find Out About Our Work with This Old House


Thank you for your interest. For questions or comments, please use the information listed here. We look forward to hearing from you soon.

(800) 729-0742

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