Definition & Meaning of "sash window"

What is a "sash window"?

A sash window is a type of window that consists of one or more movable panels, called sashes, that hold glass and can slide vertically or horizontally. These windows are designed to open and close smoothly, allowing for ventilation and easy cleaning. Sash windows often have a traditional look and are commonly found in older homes and buildings, although modern versions are also available. They can be single-hung, where only one sash moves, or double-hung, where both the upper and lower sashes can be opened. Sash windows are valued for their classic design and functionality, contributing to the overall aesthetic of a building.