| Level | Warden Office Lv. Required | Food | Wood | Steel | Gasoline | Upgrade Time |
|---|---|---|---|---|---|---|
| 1 > 2 | 7 | 10k | 2k | 10s | ||
| 2 > 3 | 10 | 180k | 36k | 9k | 21m 30s | |
| 3 > 4 | 13 | 800k | 800k | 160k | 40k | 1h 4m 30s |
| 4 > 5 | 16 | 3m | 3m | 600k | 150k | 3h 39m |
| 5 > 6 | 20 | 10m | 10m | 2m | 500k | 9h 52m 30s |
| 6 > 7 | 30m | 30m | 6m | 1.5m | 1d 13h 44m | |
| 7 > 8 | ||||||
| 8 > 9 | ||||||
| 9 > 10 |