- Plumbing, heating, air-conditioning (10)
- Electrical work (7)
- Masonry and other stonework (1)
- Plastering, drywall, and insulation (2)
- Carpentry work (2)
- Floor laying and floor work, nec (2)
- Roofing, siding, and sheetmetal work (1)
- Concrete work (4)
- Glass and glazing work (2)
- Excavation work (2)
- Installing building equipment (2)
- Special trade contractors, nec (14)