Design code-compliant stairs for Australian buildings. Calculate rise, run, number of steps, stringer length, and material requirements per NCC/BCA guidelines.
| Dimension | Calculated | NCC Limit | OK? |
|---|
The National Construction Code (NCC) sets requirements for stairs in Australian buildings. Class 1 (residential houses) requirements differ from Class 2–9 (commercial).
| Dimension | Minimum | Maximum |
|---|---|---|
| Rise (riser height) | 115mm | 190mm |
| Going (tread depth) | 240mm | 355mm |
| Stair width (clear) | 1,000mm | — |
| Nosing (overhang) | 0mm | 25mm |
| 2R + G formula | 550mm | 700mm |