| Year | NUTS | Units/building | Compartments/unit | Compartment average area (m2) | Unit average area (m2) |
| 2001 | Portugal | 2.7 | 4.7 | 17.4 | 82 |
| Mainland | 2.7 | 4.7 | 17.5 | 82 | |
| Lisbon | 21.8 | 4.5 | 17.2 | 77 | |
| 2006 | Portugal | 2.3 | 4.8 | 19.6 | 94 |
| Mainland | 2.3 | 4.8 | 19.8 | 95 | |
| Lisbon | 9.3 | 4.4 | 19.4 | 85 | |
| 2011 | Portugal | 1.9 | 5.0 | 21.5 | 107 |
| Mainland | 1.9 | 5.0 | 21.0 | 104 | |
| Lisbon | 11.4 | 4.9 | 26.6 | 130 | |
| 2019 | Portugal | 1.7 | 4.9 | 19.9 | 98 |
| Mainland | 1.7 | 4.9 | 20.0 | 98 | |
| Lisbon | 13.3 | 4.0 | 20.9 | 84 |