Courtice homeowners call us for two things: drafty builder-grade entry doors that never sealed right, and sliding patio doors that have become a two-handed shove. GT Doors supplies and installs steel and fibreglass front doors and smooth-gliding sliding glass doors across Courtice and the rest of Clarington. Because we're based right in Durham Region, you get fast scheduling and a local crew — not a subcontractor from out of the area. Free in-home measurement and quote, accurate installation, and haul-away of your old door included.