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