You will need a frame for all garage doors except sectional & roller doors. Can you use an existing frame? This will depend on the quality of the frame. In most cases, it is best to replace a wooden frame due to rotting. Steel frames usually last a considerable more amount of time. As such, you can buy a new up & over or side-hinged door and install it to your existing frame OR purchase a new frame with your door. Available in steel, modern-day frames are either primed, powder coated or are a plastisol coated steel; however, the less-popular timber and GRP alternatives are available. Manufacturers of Up & Over and Side Hinged Garage Doors usually supply a factory-fitted frame as standard.