| Age of private buildings (years) | Existing thresholds | Thresholds proposed in the Bill | |
| "Designated areas" | "Non-designated areas" | ||
| <50 | 90% (regardless of location) |
90% (regardless of location, same as current arrangement) |
|
| 50 to 59 | 80% (regardless of location) |
70% | 80% (same as current arrangement) |
| 60 to 69 | 65% | 70% | |
| ≥ 70 | 65% (regardless of location) |
||