uPVC casement windows are a type of window frame that is made of unplasticized polyvinyl chloride (uPVC), a durable and low-maintenance material that is often used in construction. Casement windows are a style of window that is hinged on the side and swings outwards like a door. They are often used in residential buildings and can come in a variety of styles and designs. uPVC casement windows are a popular choice for homeowners due to their durability, energy efficiency, and low maintenance requirements. They are resistant to rot, corrosion, and fading, and they do not require painting or sealing like traditional wood frames. They also provide good thermal insulation, which can help reduce energy costs and improve comfort inside the home.