- Plumbing, heating, air-conditioning (6)
- Painting and paper hanging (9)
- Electrical work (3)
- Masonry and other stonework (1)
- Plastering, drywall, and insulation (2)
- Carpentry work (3)
- Roofing, siding, and sheetmetal work (3)
- Concrete work (3)
- Water well drilling (2)
- Excavation work (3)
- Special trade contractors, nec (7)
