Swainstons is a well-established glazing company based in Stockton-on-Tees, with over 60 years’ experience surveying, manufacturing and installing high-quality uPVC and glazing products for both residential and commercial customers. Since 1964, we’ve built a reputation for reliable workmanship, friendly service and results that improve security, comfort and kerb appeal. Our services include uPVC windows and doors, glazing, bespoke composite doors (with an online door designer), aluminium bifold doors, French doors, conservatories, and repairs and maintenance. Free estimates and 0% finance are available. We can also coordinate trusted improvement trades through approved contractors, including joinery, plumbing and electrics.