Special trade contractors
Carpentry Work
Concrete Work
Electrical Work
Excavation Work
Floor Laying and Other Floor Work, NEC
Glass and Glazing Work
Installation or Erection of Building Equipment, NEC
Masonry, Stone Setting, and Other Stone Work
Painting and Paper Hanging
Plastering, Drywall, Acoustical, and Insulation Work
Plumbing, Heating, and Air-Conditioning
Roofing, Siding, and Sheet Metal Work
Special Trade Contractors, NEC
Structural Steel Erection
Terrazzo, Tile, Marble, and Mosaic Work
Water Well Drilling
Wrecking and Demolition Work