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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.

After years of controversy, experts now believe they were originally invented in Yorkshire. They were developed there to keep out wet weather while permitting air to circulate by leaving a narrow opening, and were also protected from rot and distortion by being closed in a box.

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 Georgian sash window took on the modern double sash form. Blown glass with bull’s eye markings were the most common form, but still expensive. As better methods of making large panes were found, windows with six panels in each sash appeared, becoming characteristic of the Georgian sash window. 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. Sash windows that are gradated in size, becoming smaller at the top of the building are indicative of the style of this time, as are large bay windows. Four paned sashes are more common in houses built at this time. The wealthy often chose to have older styles of window added to their property to distinguish themselves from the increasingly common use of plate glass sash windows with the slimmer glazing bars that were once prized.

Despite their popularity at the start of the 20th century, sash windows have become less common during the last hundred years, with cheaper, less labor intensive types of window being used instead. 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.