Maine Glass has a successful history of using interior insulating windows to upgrade windows at historically significant buildings.

Our windows have been approved and installed in several buildings on the National Register of Historic Places. In addition, each individual state that has reviewed our windows has approved our windows through their Historic Preservation Society.

During a typical installation a building’s existing historic windows are not removed or altered, they stay just as they are. Then, using a unique and patented product line, Maine Glass installs an interior window on the inside of the existing historic window. The end result is a window system that performs and insulates as well or better than new replacement windows, all without changing the existing historic windows.