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Sash windows are an integral component of 18th and 19th century style. 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.

There were both functional and aesthetic advantages to sash windows, and many people chose to replace their old windows with them, while they were also popular in newly built homes. The window tax of the 18th and 19th centuries caused many of these fashionable windows to be taken out again, however. 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. As techniques improved, larger panes became available and were used to create the characteristic Georgian windows, with narrow glazing bars and six panes in each sash..

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. Sashes with four panes of glass are another mark of the Victorian window. 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.

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. An interest in conserving historical styles of architecture has recently revived the demand for sash windows, however. Modern versions of the sash window preserve the traditional character of older properties, while combining all the latest developments in manufacturing processes with the grace and practicality that this style epitomizes.