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