Boston Bi Glass has set the standard for the best quality window restoration and window renovation company. Windows are an architectural focal point of any property - restoring the functionality and appearance of those windows is crucial. The innovative patented process known as Bi Glass® is a proven system. Bi Glass has been installed in many homes, churches, colleges, town and city halls, libraries, and historic buildings throughout the Northeast. Maybe you are looking at paint-shut windows, broken ropes, cracked glass, or rotten wood.