Our Period™ timber sash window collection has been hand-crafted to represent simplicity and grandeur of a traditional sash window, whilst enhancing it with the latest modern day technology without detracting from original lines and authentic period look. Available as traditional Box Sash on weights or operating on pre-tensioned hidden spring balances to suit individual project requirements. The character and feel of Period™ Box sash window represents the simple grace of English sash windows progressively developed from early use by Wren in the late 17th Century, through their peak of elegance in the late Georgian period and in common usage by the Victorians and Edwardians. Sash windows were used almost exclusively in new buildings, from Royal Palaces to ordinary cottages. Soon box sash windows became a fashionable status symbol across the whole of Britain.