Giant Garage Door Repair, Alton is the #1 garage door specialist in the industry. We install, service and repair all kinds and types of garage doors in Alton. We have the best team of expert professionals who know how to handle each and every type of garage door and its components. This is because all of our technicians go through a rigorous training process, covering every known garage door repair technique. We do not let them onto the field until we know that they are completely trained, and can perform a job to perfection.