uPVC windows are windows with frames made from unplasticized polyvinyl chloride, a rigid and durable type of plastic that offers excellent durability, weather resistance, and low maintenance. They are energy-efficient, provide good insulation, block noise and dust, are resistant to rot, rust, and corrosion, and can last for 20 years or more. Modern uPVC windows are available in various styles, colors, and finishes, including realistic wood-grain effects, and can be fitted with double or triple glazing for enhanced thermal performance.