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.
Their origin has almost certainly been traced back to Yorkshire in 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.
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.During the Georgian era, sash windows became what they are today, with the development of the two moving sashes. 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..
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. Sashes with four panes of glass are another mark of the Victorian window. 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.
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.