The origins of the sash window are generally thought to be in England, since there the earliest examples were seen in elegant houses. Windows, designed to let in light while shutting out the elements, were formerly fixed panels or casement windows, which were hinged at the sides, pushed outward to open and pulled in and latched to close.

Inventor and scientist Robert Hooke is credited with the invention. Hooke coined the term ‘cell’ for a basic unit of life observed under the early microscopes, developed many theories about gravity and the movement of heavenly bodies, designed many prominent buildings in London, developed a balance spring that replaced the pendulum in time keeping and ushered in the watch, and studied the physical properties of glass.

Robert Hooke, a brilliant man born in England in the 1600s, was both a practical man skilled in clock making and surveying, a skilled architect, a biologist, and a physicist. He studied gravity, the properties of glass, and invented a balance spring that led to the development of the watch. It is easy to see how these studies contributed to his window, moving up and down with a weight to offset the pull of gravity, with muntins (strips of wood holding individual panes of glass in a frame) to relieve stress on the amount of glass needed for large panels, and attractive enough to grace a stately home.

Over time, sash windows made of wood will loosen in their frames, as continual opening and shutting wears the jambs and tracks, and the wood itself expands and contracts with the changing seasonal temperatures and shows the effects of weather. Older windows may rattle in the wind and let air leak in or out around the joints. They also may refuse to open as paint builds up in the seams, or refuse to stay pushed up when the sash cords get brittle and break with age.

Repairing these old windows is an option that many choose, since a handy homeowner with simple tools and a vast amount of patience can do the job. Others wish to retain as much of the original structure as possible when renovating an historic property. Replacement is an option as well, as many reproduction windows are manufactures out of traditional materials, and custom woodworking mills can make exact replicas of old designs.

Wooden windows may be repaired; the work is time consuming and requires some expertise and certain tools to take the sashes from the frame and examine and replace such things as stops, cords, corroded pulleys, and missing weights. Many homeowners repair their own windows, while others resort to propping them open with sticks and stuffing the cracks with folded paper to stop rattles. Full replacement is an option, as well.

The origins of the sash window in England may account for its popularity in other areas which were once English colonies.

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