Special trade contractors primarily engaged in plumbing, heating, air-conditioning, and similar work. Sheet metal work performed by plumbing, heating, and air-conditioning contractors in conjunction with the installation of plumbing, heating, and air-conditioning equipment is included.
General contractors primarily engaged in the construction (including new work, additions, alterations, remodeling, and repair) of nonresidential buildings, other than industrial buildings and warehouses. Included are nonresidential buildings, such as commercial, institutional, religious, and amusement and recreational buildings.
Establishments primarily engaged in furnishing building cleaning and maintenance services, not elsewhere classified, such as window cleaning, janitorial service, floor waxing, and office cleaning.
General contractors primarily engaged in the construction (including new work, additions, alterations, remodeling, and repair) of nonresidential buildings, other than industrial buildings and warehouses. Included are nonresidential buildings, such as commercial, institutional, religious, and amusement and recreational buildings.