The architectural style of the 18th and 19th centuries is closely associated with sash windows. Their popularity stemmed from their larger panes of glass and more elegant proportions than 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. The window tax of the 18th and 19th centuries caused many of these fashionable windows to be taken out again, however.During the Georgian era, sash windows became what they are today, with the development of the two moving sashes. 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 Victorians continued to favor sash windows, but added their own style with elaborate carved and molded ornamentation. Victorian houses often have large bay windows and elegantly proportioned facades with the windows getting gradually smaller as their height from the ground increases. Sashes with four panes of glass are another mark of the Victorian window. Imitations of older style windows were also popular towards the end of the 19th century, as the wealthy sought to differentiate themselves from the previously prized plate glass and narrow glazing bars that had became more affordable.
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. Recently people have begun to take an interest in the historic character of their homes, resulting in greater demand for traditional style sash windows. 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.