Wooden box sash windows were once a common sight in British homes, but they are now becoming increasingly popular as people look for ways to add character and style to their properties. At our wooden sash windows service, we specialise in the manufacture, installation and repair of these beautiful windows. Box sash windows are made up of two or more panels that slide vertically up and down within a frame. They are typically made from wood, although uPVC versions are also available. Wooden box sash windows are often considered to be more energy-efficient than their uPVC counterparts, as they can be better at trapping heat in your home.