Structures of buildings
- 91/91.080/91.080.01 Structures of buildings in general
- 91/91.080/91.080.10 Metal structures
- 91/91.080/91.080.13 Steel structures
- 91/91.080/91.080.17 Aluminium structures
- 91/91.080/91.080.20 Timber structures
- 91/91.080/91.080.30 Masonry
- 91/91.080/91.080.40 Concrete structures
- 91/91.080/91.080.99 Other structures