- Plumbing, heating, air-conditioning (6)
- Electrical work (4)
- Plastering, drywall, and insulation (1)
- Terrazzo, tile, marble and mosaic work (2)
- Carpentry work (2)
- Roofing, siding, and sheetmetal work (2)
- Concrete work (1)
- Structural steel erection (1)
- Excavation work (6)
- Special trade contractors, nec (2)
