| L | F | Construction Industries |
| L | 40 | Building, Developing and General Contracting Industries |
| L | 401 | Residential Building and Development |
| L | 4011 | Single Family Housing |
| L | 4012 | Apartment and Other Multiple Housing |
| L | 4013 | Residential Renovation |
| L | 402 | Non-Residential Building and Development |
| L | 4021 | Manufacturing and Light Industrial Building |
| L | 4022 | Commercial Building |
| L | 4023 | Institutional Building |
| L | 41 | Industrial and Heavy (Engineering) Construction Industries |
| L | 411 | Industrial Construction (Other Than Buildings) |
| L | 4111 | Power Plants (except Hydroelectric) |
| L | 4112 | Gas, Oil and Other Energy Related Structures (except Pipelines) |
| L | 4113 | Gas and Oil Pipelines |
| L | 4119 | Other Industrial Construction |
| L | 412 | Highway and Heavy Construction |
| L | 4121 | Highways, Streets and Bridges |
| L | 4122 | Waterworks and Sewage Systems |
| L | 4123 | Hydroelectric Power Plants and Related Structures (except. Transmission Lines) |
| L | 4124 | Power and Telecommunication Transmission Lines |
| L | 4129 | Other Heavy Construction |
| L | 42 | Trade Contracting Industries |
| L | 421 | Site Work |
| L | 4211 | Wrecking and Demolition |
| L | 4212 | Water Well Drilling |
| L | 4213 | Septic System Installation |
| L | 4214 | Excavating and Grading |
| L | 4215 | Equipment Rental (with Operator) |
| L | 4216 | Asphalt Paving |
| L | 4217 | Fencing Installation |
| L | 4219 | Other Site Work |
| L | 422 | Structural and Related Work |
| L | 4221 | Piledriving Work |
| L | 4222 | Form Work |
| L | 4223 | Steel Reinforcing |
| L | 4224 | Concrete Pouring and Finishing |
| L | 4225 | Precast Concrete Installation |
| L | 4226 | Rough and Framing Carpentry |
| L | 4227 | Structural Steel Erection |
| L | 4229 | Other Structural and Related Work |
| L | 423 | Exterior Close-In Work |
| L | 4231 | Masonry Work |
| L | 4232 | Siding Work |
| L | 4233 | Glass and Glazing Work |
| L | 4234 | Insulation Work |
| L | 4235 | Roof Shingling |
| L | 4236 | Sheet Metal and Built-Up Roofing |
| L | 4239 | Other Exterior Close-In Work |
| L | 424 | Plumbing, Heating and Air Conditioning, Mechanical Work |
| L | 4241 | Plumbing |
| L | 4242 | Dry Heating and Gas Piping Work |
| L | 4243 | Wet Heating and Air Conditioning Work |
| L | 4244 | Sheet Metal and Other Duct Work |
| L | 425 | Mechanical Specialty Work |
| L | 4251 | Process Piping Work |
| L | 4252 | Automatic Sprinkler System Installation |
| L | 4253 | Commercial Refrigeration Work |
| L | 4254 | Environmental Control Work |
| L | 4255 | Millwright and Rigging Work |
| L | 4256 | Thermal Insulation Work |
| L | 4259 | Other Mechanical Specialty Work |
| L | 426 | Electrical Work |
| L | 4261 | Electrical Work |
| L | 427 | Interior and Finishing Work |
| L | 4271 | Plastering and Stucco Work |
| L | 4272 | Drywall Work |
| L | 4273 | Acoustical Work |
| L | 4274 | Finish Carpentry |
| L | 4275 | Painting and Decorating Work |
| L | 4276 | Terrazzo and Tile Work |
| L | 4277 | Hardwood Flooring Installation |
| L | 4278 | Resilient Flooring and Carpet Work |
| L | 4279 | Other Interior and Finishing Work |
| L | 429 | Other Trade Work |
| L | 4291 | Elevator and Escalator Installation |
| L | 4292 | Ornamental and Miscellaneous Fabricated Metal Installation |
| L | 4293 | Residential Swimming Pool Installation |
| L | 4299 | Other Trade Work n.e.c. |
| L | 44 | Service Industries Incidental to Construction |
| L | 441 | Project Management, Construction |
| L | 4411 | Project Management, Construction |
| L | 449 | Other Services Incidental to Construction |
| L | 4491 | Land Developers |
| L | 4499 | Other Services Incidental to Construction n.e.c. |