Sash windows are a type of window that open vertically and horizontally, with one or more panels that move up and down in a track. They have been popular in the UK since the 17th century, and remain a staple of British architecture to this day. Some of the benefits of sash windows include:

• Increased energy efficiency: Sash windows are great at keeping the heat in during the winter and out during the summer. They are often installed with double glazing, which can further improve their energy efficiency.
• Improved appearance: Sash windows are a classic and elegant addition to any building. They can be made from a variety of materials, including wood, uPVC, and aluminium, but wooden sash windows are particularly popular among homeowners who want to preserve the traditional look of their building.
• Easy to maintain: Wooden sash windows require some maintenance, but they're not difficult to take care of. With proper care, they can last for many years.