| L | 23 | Construction |
| L | 231 | Prime Contracting |
| L | 2311 | Land Subdivision and Land Development |
| L | 23111 | Land Subdivision and Land Development |
| L | 231110 | Land Subdivision and Land Development |
| L | 2312 | Building Construction |
| L | 23121 | Residential Building Construction |
| L | 231210 | Residential Building Construction |
| L | 23122 | Non-Residential Building Construction |
| L | 231220 | Non-Residential Building Construction |
| L | 2313 | Engineering Construction |
| L | 23131 | Highway, Street and Bridge Construction |
| L | 231310 | Highway, Street and Bridge Construction |
| L | 23132 | Water and Sewer Construction |
| L | 231320 | Water and Sewer Construction |
| L | 23133 | Oil and Gas Pipelines and Related Industrial Complexes Construction |
| L | 231330 | Oil and Gas Pipelines and Related Industrial Complexes Construction |
| L | 23139 | Other Engineering Construction |
| L | 231390 | Other Engineering Construction |
| L | 2314 | Construction Management |
| L | 23141 | Construction Management |
| L | 231410 | Construction Management |
| L | 232 | Trade Contracting |
| L | 2321 | Site Preparation Work |
| L | 23211 | Site Preparation Work |
| L | 232110 | Site Preparation Work |
| L | 2322 | Building Structure Work |
| L | 23221 | Forming Work |
| L | 232210 | Forming Work |
| L | 23222 | Concrete Pouring and Finishing Work |
| L | 232220 | Concrete Pouring and Finishing Work |
| L | 23223 | Structural Steel and Precast Concrete Erection Work |
| L | 232230 | Structural Steel and Precast Concrete Erection Work |
| L | 23224 | Crane Rental Services |
| L | 232240 | Crane Rental Services |
| L | 23225 | Framing and Rough Carpentry Work |
| L | 232250 | Framing and Rough Carpentry Work |
| L | 23229 | Other Building Structure Work |
| L | 232290 | Other Building Structure Work |
| L | 2323 | Building Exterior Finishing Work |
| L | 23231 | Masonry Work |
| L | 232310 | Masonry Work |
| L | 23232 | Glass and Glazing Work |
| L | 232320 | Glass and Glazing Work |
| L | 23233 | Roofing and Related Work |
| L | 232330 | Roofing and Related Work |
| L | 23234 | Metallic and Other Siding Work |
| L | 232340 | Metallic and Other Siding Work |
| L | 23239 | Other Building Exterior Finishing Work |
| L | 232390 | Other Building Exterior Finishing Work |
| L | 2324 | Building Interior Finishing Work |
| L | 23241 | Drywall and Plaster Work |
| L | 232410 | Drywall and Plaster Work |
| L | 23242 | Terrazzo and Tile Work |
| L | 232420 | Terrazzo and Tile Work |
| L | 23243 | Carpet and Resilient Flooring Work |
| L | 232430 | Carpet and Resilient Flooring Work |
| L | 23244 | Insulation Work |
| L | 232440 | Insulation Work |
| L | 23245 | Building Painting and Paperhanging Work |
| L | 232450 | Building Painting and Paperhanging Work |
| L | 23246 | Finish Carpentry and Wood Flooring Work |
| L | 232460 | Finish Carpentry and Wood Flooring Work |
| L | 23249 | Other Building Interior Finishing Work |
| L | 232490 | Other Building Interior Finishing Work |
| L | 2325 | Building Equipment Installation |
| L | 23251 | Electrical Work |
| L | 232510 | Electrical Work |
| L | 23252 | Plumbing, Heating and Air-Conditioning Installation |
| L | 232520 | Plumbing, Heating and Air-Conditioning Installation |
| L | 23253 | Automatic Sprinkler System Installation |
| L | 232530 | Automatic Sprinkler System Installation |
| L | 23254 | Commercial Refrigeration Installation |
| L | 232540 | Commercial Refrigeration Installation |
| L | 23255 | Elevator and Escalator Installation |
| L | 232550 | Elevator and Escalator Installation |
| L | 23259 | Other Building Equipment Installation |
| L | 232590 | Other Building Equipment Installation |
| L | 2329 | Other Special Trade Contracting |
| L | 23291 | Fencing and Interlocking Stone Contracting |
| L | 232910 | Fencing and Interlocking Stone Contracting |
| L | 23292 | Residential and Commercial Paving Contracting |
| L | 232920 | Residential and Commercial Paving Contracting |
| L | 23299 | All Other Special Trade Contracting |
| L | 232990 | All Other Special Trade Contracting |