Garage door businesses supply, install, repair and maintain doors for domestic garages and, in some cases, commercial premises. They can advise on suitable designs and measurements, remove or replace existing doors, and fit new frames, tracks, locks and operating equipment. The work may include checking that the opening is suitable and that the door moves and closes correctly. Common options include up-and-over, sectional, roller and side-hinged doors, made from materials such as steel, timber or GRP. Customers may also be able to choose finishes, colours, insulation and window panels. Some businesses install electric operators and remote controls, or adapt existing doors for powered operation. Repair services can cover damaged panels, worn springs, cables, hinges, rollers, tracks, locks and faulty motors or controls. Routine servicing may involve inspecting moving parts, adjusting the door and testing its operation.