- Plumbing, heating, air-conditioning (26)
- Painting and paper hanging (7)
- Electrical work (14)
- Masonry and other stonework (6)
- Plastering, drywall, and insulation (3)
- Terrazzo, tile, marble and mosaic work (4)
- Carpentry work (11)
- Roofing, siding, and sheetmetal work (4)
- Concrete work (4)
- Water well drilling (1)
- Glass and glazing work (1)
- Excavation work (8)
- Special trade contractors, nec (11)
