- Plumbing, heating, air-conditioning (7)
- Painting and paper hanging (2)
- Electrical work (6)
- Carpentry work (1)
- Floor laying and floor work, nec (1)
- Roofing, siding, and sheetmetal work (4)
- Concrete work (6)
- Excavation work (2)
- Special trade contractors, nec (4)
