Glass doors. Glass garage doors have become much more common in residential applications. Typically, the doors are constructed in a paneled design with a grid pattern separating the panes of glass. The grids can be fabricated from wood or metal, similar to window frames. The glass on these doors is designed to be strong and tamper-resistant, with several opacity options from which to choose, including clear, frosted and tinted colors. There are also solar treatments that encourage thermal heat gain.Glass is the preferred material for those converting garages into rooms or studios, and certainly for those installing garage doors in unconventional spaces because of their clean, modern aesthetic and the fact that they act as an enormous window when closed, bringing in all kinds of natural light.