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Sash windows are an integral component of 18th and 19th century style. Their popularity stemmed from their larger panes of glass and more elegant proportions than 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. Blown glass with bull’s eye markings were the most common form, but still expensive. 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. They became a key part of Regency architecture.

Sash windows continued to be popular during the reign of Queen Victoria, although carved and molded decorations were commonly added to them. 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. 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.

During the 20th century, sash windows have tended to disappear from our streets, being replaced by cheaper, mass-produced windows. 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.