- Plumbing, heating, air-conditioning (11)
- Painting and paper hanging (10)
- Electrical work (9)
- Masonry and other stonework (4)
- Plastering, drywall, and insulation (3)
- Terrazzo, tile, marble and mosaic work (3)
- Carpentry work (7)
- Floor laying and floor work, nec (3)
- Roofing, siding, and sheetmetal work (3)
- Concrete work (3)
- Excavation work (6)
- Installing building equipment (1)
- Special trade contractors, nec (7)
