This major group includes special trade contractors who undertake activities of a type that are specialized either to building construction, including work on mobile homes, or to both building and nonbuilding projects. These activities include painting (including bridge painting and traffic lane painting), electrical work (including work on bridges, power lines, and power plants), carpentry work, plumbing, heating, air-conditioning, roofing, and sheet metal work. Special trade contractors primarily engaged in activities that are clearly of a type specialized to heavy construction, such as grading for highways and airport runways; guardrail construction; installation of highway signs; underwater rock removal; and asphalt and concrete construction of roads, highways, streets, and public sidewalks are classified in Major Group 16.

Special trade contractors may work on subcontract from the general contractor, performing only part of the work covered by the general contract, or they may work directly for the owner. Special trade contractors for the most part perform their work at the site of construction, although they also may have shops where they perform work incidental to the job site.
Industry Group 171: Plumbing, Heating And Air-conditioning
·1711 Plumbing, Heating and Air-Conditioning
Industry Group 172: Painting And Paper Hanging
·1721 Painting and Paper Hanging
Industry Group 173: Electrical Work
·1731 Electrical Work
Industry Group 174: Masonry, Stonework, Tile Setting, And Plastering
·1741 Masonry, Stone Setting, and Other Stone Work
·1742 Plastering, Drywall, Acoustical, and Insulation Work
·1743 Terrazzo, Tile, Marble, and Mosaic Work
Industry Group 175: Carpentry And Floor Work
·1751 Carpentry Work
·1752 Floor Laying and Other Floor Work, Not Elsewhere Classified
Industry Group 176: Roofing, Siding, And Sheet Metal Work
·1761 Roofing, Siding, and Sheet Metal Work
Industry Group 177: Concrete Work
·1771 Concrete Work
Industry Group 178: Water Well Drilling
·1781 Water Well Drilling
Industry Group 179: Miscellaneous Special Trade Contractors
·1791 Structural Steel Erection
·1793 Glass and Glazing Work
·1794 Excavation Work
·1795 Wrecking and Demolition Work
·1796 Installation or Erection of Building Equipment, Not Elsewhere
·1799 Special Trade Contractors, Not Elsewhere Classified

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