- Plumbing, heating, air-conditioning (11)
- Painting and paper hanging (3)
- Electrical work (6)
- Masonry and other stonework (1)
- Terrazzo, tile, marble and mosaic work (2)
- Carpentry work (3)
- Floor laying and floor work, nec (2)
- Concrete work (2)
- Water well drilling (4)
- Excavation work (2)
- Special trade contractors, nec (5)
