- Plumbing, heating, air-conditioning (13)
- Painting and paper hanging (12)
- Electrical work (9)
- Masonry and other stonework (5)
- Plastering, drywall, and insulation (3)
- Carpentry work (5)
- Floor laying and floor work, nec (3)
- Roofing, siding, and sheetmetal work (4)
- Concrete work (5)
- Wrecking and demolition work (1)
- Special trade contractors, nec (2)
