About S.D. Glass UPVC S.D. Glass UPVC is a GST-registered proprietorship firm owned by Mr. Swalheen Khan, located in Dadri, Gautam Buddha Nagar, Uttar Pradesh. We specialize in manufacturing and installing premium quality UPVC and aluminium windows and doors that combine durability, style, and performance. Our mission is to provide modern window and door solutions that enhance security, comfort, and energy efficiency for homes and commercial spaces. We believe in transparency, quality workmanship, and long-term customer relationships.