Design working life category | Indicative design working life (years) | Examples |
1 | 10 | Temporary structures |
2 | 10 to 25 | Replaceable structural parts, e.g. gantry girders, bearings |
3 | 15 to 30 | Agricultural and similar structures |
4 | 50 | Building structures and other common structures |
5 | 100 | Monumental building structures, bridges and other civil engineering structures. |