- Plumbing, heating, air-conditioning (38)
- Painting and paper hanging (19)
- Electrical work (16)
- Masonry and other stonework (6)
- Terrazzo, tile, marble and mosaic work (5)
- Carpentry work (6)
- Floor laying and floor work, nec (11)
- Roofing, siding, and sheetmetal work (11)
- Concrete work (6)
- Glass and glazing work (1)
- Excavation work (1)
- Installing building equipment (1)
- Special trade contractors, nec (17)
