Our trained, certified garage door repair technicians are available 24 hours a day, serving customers throughout Canada.Door Doctor Inc.As a garage door company Door Doctor was founded in 1988 in the Greater Toronto area. Located close to Markham we have since expanded our services to include two additional locations; one in Barrie, serving the Simcoe area, and the other in Oshawa, servicing the Durham area. more... See more text