- Plumbing, heating, air-conditioning (24)
- Painting and paper hanging (12)
- Electrical work (19)
- Plastering, drywall, and insulation (12)
- Terrazzo, tile, marble and mosaic work (3)
- Carpentry work (3)
- Floor laying and floor work, nec (2)
- Roofing, siding, and sheetmetal work (3)
- Concrete work (14)
- Water well drilling (3)
- Structural steel erection (1)
- Glass and glazing work (4)
- Excavation work (12)
- Special trade contractors, nec (20)
