The Portastor all-steel storage building is available in a range of sizes - shown below.
| External length (m) | External width (m) | External height (m) | Floor area (m²) | ||
| 360/25 | 3.76 | 2.56 | 2.89 | 8.64 | |
| External length (m) | External width (m) | External height (m) | Floor area (m²) | ||
| 480/25 | 4.96 | 2.56 | 2.89 | 11.52 | |
| External length (m) | External width (m) | External height (m) | Floor area (m²) | ||
| 600/25 | 6.16 | 2.56 | 2.89 | 14.40 | |
| External length (m) | External width (m) | External height (m) | Floor area (m²) | ||
| 720/25 | 7.36 | 2.56 | 2.89 | 17.28 | |
| External length (m) | External width (m) | External height (m) | Floor area (m²) | ||
| 960/25 | 9.76 | 2.56 | 2.89 | 23.04 | |