235 Special Trade Contractors
2351 Plumbing, Heating, and Air-Conditioning Contractors
- 23511 Plumbing, Heating, and Air-Conditioning
Contractors
2352 Painting and Wall Covering Contractors
- 23521 Painting and Wall Covering Contractors
2353 Electrical Contractors
- 23531 Electrical Contractors
2354 Masonry, Drywall, Insulation, and Tile Contractors
- 23541 Masonry and Stone Contractors
- 23542 Drywall, Plastering, Acoustical, and Insulation
Contractors
- 23543 Tile, Marble, Terrazzo, and Mosaic Contractors
2355 Carpentry and Floor Contractors
- 23551 Carpentry Contractors
- 23552 Floor Laying and Other Floor Contractors
2356 Roofing, Siding, and Sheet Metal Contractors
- 23561 Roofing, Siding, and Sheet Metal Contractors
2357 Concrete Contractors
- 23571 Concrete Contractors
2358 Water Well Drilling Contractors
- 23581 Water Well Drilling Contractors
2359 Other Special Trade Contractors
- 23591 Structural Steel Erection Contractors
- 23592 Glass and Glazing Contractors
- 23593 Excavation Contractors
- 23594 Wrecking and Demolition Contractors
- 23595 Building Equipment and Other Machinery
Installation Contractors
- 23599 All Other Special Trade Contractors