- Plumbing, heating, air-conditioning (5)
- Painting and paper hanging (4)
- Electrical work (2)
- Carpentry work (1)
- Floor laying and floor work, nec (3)
- Roofing, siding, and sheetmetal work (4)
- Water well drilling (3)
- Structural steel erection (2)
- Excavation work (2)
- Special trade contractors, nec (5)
