Sash windows are made up of two panels - one on top and one on the bottom - that slide vertically to open and close. They have been around for centuries and are a popular choice among homeowners who want to give their home a traditional and classic look. They are typically made of timber, although other materials like uPVC may also be used.

Sash windows have several advantages over other types of windows. For one, they provide excellent ventilation because they can be opened from both the top and bottom, which allows for a flow of fresh air. They are also very easy to clean and maintain, with many modern sash windows featuring hidden spring mechanisms that make them simple to operate.