| 91010 | Construction industry |
| 91020 | Physical planning. Town planning |
| 91040 | Buildings |
| 91060 | Elements of buildings |
| 91080 | Structures of buildings |
| 91090 | External structures |
| 91100 | Construction materials |
| 91120 | Protection of and in buildings |
| 91140 | Installations in buildings |
| 91160 | Lighting |
| 91180 | Interior finishing |
| 91190 | Building accessories |
| 91200 | Construction technology |
| 91220 | Construction equipment |
