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Sash windows are associated with the architecture of the 18th and 19th centuries. Their large panels of glass within gracefully proportioned frames offered an attractive and functional alternative to casement windows.

Despite much debate, the sash window is now thought to have originated in Yorkshire, England. They offered greater resistance to rot and distortion, while being able to keep out the weather and still allow fresh air in since they can be opened only slightly when it is raining.

Sash windows offered both practical advantages and a more pleasing style than older window designs, and they were popular in both new buildings and as stylish replacements in existing homes. During the mid 18th century the introduction of the window tax caused many windows to be removed. The window with two movable sashes was developed during the Georgian era. Glass remained expensive and was marked with large bull’s eye patterns in the center of each pane due to the way it was made. Once larger panels became available the classic six-paned Georgian windows appeared. They are considered characteristic of the Regency style.

The popularity of these windows have remained strong during the Victorian age, but they were ornamented with elaborate decorations. Gradated windows, diminishing in size with the height of the building, and large bay windows are characteristic of this period. Four paned sashes often indicate a Victorian style. While the absence of glazing bars was originally a status symbol, many people put in windows that imitated older styles once sheet glass had become cheaper and more commonly used during the late 19th century.

Sash windows have become far less common during the last century, despite being the favorite style at the beginning of the 20th century, due to the increase in cheap, mass-produced styles of window. Demand has recently grown again due to increased awareness of architectural history. Sash windows today use all the latest technology, but retain the elegance and functionality of traditional sashes, and preserve the historic style of the older houses.