| 93010 | Civil engineering in general |
| 93020 | Earthworks. Excavations. Foundation construction. Underground works |
| 93025 | External water conveyance systems |
| 93030 | External sewage systems |
| 93040 | Bridge construction |
| 93060 | Tunnel construction |
| 93080 | Road engineering |
| 93100 | Construction of railways |
| 93110 | Construction of ropeway |
| 93120 | Construction of airports |
| 93140 | Construction of waterways , ports and dykes |
| 93160 | Hydraulic construction |
