Sash windows are clearly among the most popular in England, but you can also find them in other countries. Sash window or hung sash window has a specific structure and also requires proper installation. If you want to learn more about this type of windows, check out our short tutorial on this website - thanks to it you will be able to choose for yourself the appropriate windows! Not everyone knows that the sash windows are used for centuries. One of the oldest buildings with windows of this kind is the Ham House - a historic house from 17th century which is located in Ham over the River Thames. But there is no certainty as to their origin - some suggest the English architect and philosopher Robert Hooke designed them, but also there are reports that the windows come from Denmark.