RESTORING HISTORIC WINDOWS Unless a building is completely gutted, installing new window units often greatly outweighs the cost of restoration in place. Restoration also preserves the historic character of the windows and surrounds. Keeping within budget takes careful planning. Start by familiarizing yourself with the materials you are working with and the restoration techniques that are available. The first step in planning is to divide the windows into their basic categories. It is not unusual to have more than one type of window in a facade. How many are double-hung, casement, or fixed transom? Do you have windows that pivot rather than hinge? What material, or combination of materials, are the windows made of? Are they wood or metal, and what types?