Applies to contractors engaged in the installation, service or repair of garage or overhead doors made of wood or metal. As part of a new construction project, the installation usually occurs before the building or structure is painted. Garage or overhead door installation can also occur as a replacement to an existing door or as an alteration or addition to a building or structure. The process involves installing door tracks on both sides of the doorway, inserting the door, which usually consists of panels or sections, into the tracks, and attaching panels or sections to one another. This classification also includes the installation of automatic door openers when performed as a part of the garage or overhead door installation contract, and by the same contractor installing the doors.

This classification excludes the installation, service or repair of commercial automatic door openers when it is not performed as a part of the garage or overhead door installation contract which is to be reported separately in classification 0603; the installation, service or repair of residential automatic door openers when it is not performed as a part of the garage or overhead door installation contract which is to be reported separately in classification 0607; the installation of exterior glass doors and door frames such as nonautomatic and automatic opening doors at retail establishments or commercial buildings which are to be reported separately in classification 0511; the installation of interior or exterior doors and door frames when performed by a framing contractor as part of framing a wood frame building which is to be reported separately in classification 0510; the installation of interior doors and door frames which is to be reported separately in classification 0513; the installation of wood, fiberglass or metal exterior doors as part of a nonwood frame building when performed by employees of the general contractor which is to be reported separately in classification 0518; and the repair or replacement of wood, fiberglass or metal doors on an existing building which is to be reported separately in classification 0516.

Applies to contractors engaged in the installation, removal, alteration, and/or repair of nonstructural additions to buildings or structures. Nonstructural metal additions include, but are not limited to, fire escapes, staircases, balconies, railings, roll down shutters, window or door lintels, protective window or door gratings, bank cages, decorative elevator entrances or doors, permanent stadium seating, and wall facades and facings. Generally, the process involves bolting, screwing, riveting, or welding these additions to the interior or exterior of buildings or structures. Contractors who operate a shop to prefabricate the additions are to be assigned the classification applicable for the shop manufacturing work being performed. When a contractor's business is assigned a manufacturing classification for shop operations, classification 5206, "Permanent yard or shop," is no longer applicable to the contractor's business for the storage of materials or repair of equipment.

This classification excludes sheet metal installation such as siding, gutters and downspouts, and nonstructural sheet metal patio covers/carports which are to be reported separately in classification 0519; the installation, repair or dismantling of portable bleachers or stages which is to be reported separately in classification 0603; and the erection of commercial metal carports, service station canopies, and structural iron or steel work as part of a building or structure which is to be reported separately in classification 0518.