- Plumbing, heating, air-conditioning (3)
- Electrical work (2)
- Plastering, drywall, and insulation (3)
- Floor laying and floor work, nec (1)
- Roofing, siding, and sheetmetal work (1)
- Concrete work (1)
- Excavation work (2)
- Special trade contractors, nec (1)
