- Plumbing, heating, air-conditioning (3)
- Painting and paper hanging (2)
- Masonry and other stonework (1)
- Plastering, drywall, and insulation (1)
- Carpentry work (2)
- Roofing, siding, and sheetmetal work (1)
- Excavation work (3)
- Installing building equipment (1)
- Special trade contractors, nec (3)
