- Plumbing, heating, air-conditioning (10)
- Electrical work (4)
- Plastering, drywall, and insulation (1)
- Carpentry work (1)
- Floor laying and floor work, nec (1)
- Roofing, siding, and sheetmetal work (5)
- Glass and glazing work (1)
- Special trade contractors, nec (10)
