If you own a period property, you are likely to have sash windows. Sash windows are a type of window that date back to the 17th century and are common in Georgian, Victorian and Edwardian architecture. They are characterised by two sashes that slide up and down and have a distinctive look that is synonymous with traditional British architecture.

Sash windows are not just a matter of style, however. They are also designed to offer excellent ventilation and are incredibly durable, with many original sash windows still being in use today.