| Level | Warden Office Lv. Required | Food | Wood | Steel | Gasoline | Upgrade Time |
|---|---|---|---|---|---|---|
| 1 > 2 | 9 | 300 | 9s | |||
| 2 > 3 | 9 | 1500 | 45s | |||
| 3 > 4 | 9 | 3k | 600 | 2m 15s | ||
| 4 > 5 | 9 | 14k | 2800 | 4m 30s | ||
| 5 > 6 | 9 | 35k | 7k | 1750 | 9m | |
| 6 > 7 | 9 | 120k | 24k | 6k | 18m | |
| 7 > 8 | 9 | 200k | 40k | 10k | 27m | |
| 8 > 9 | 9 | 450k | 90k | 22.5k | 40m 30s | |
| 9 > 10 | 10 | 800k | 160k | 40k | 54m | |
| 10 > 11 | 11 | 1m | 1m | 200k | 50k | 1h 7m 30s |
| 11 > 12 | 12 | 1.4m | 1.4m | 280k | 70k | 1h 21m |
| 12 > 13 | 13 | 2m | 2m | 400k | 100k | 1h 39m |
| 13 > 14 | 14 | 2.5m | 2.5m | 500k | 125k | 2h 6m |
| 14 > 15 | 15 | 3.5m | 3.5m | 700k | 175k | 2h 42m |
| 15 > 16 | 16 | 4.5m | 4.5m | 900k | 225k | 4h 34m |
| 16 > 17 | 17 | 7.5m | 7.5m | 1.5m | 375k | 5h 29m |
| 17 > 18 | 18 | 10m | 10m | 2m | 500k | 6h 51m 40s |
| 18 > 19 | 19 | 12.5m | 12.5m | 2.5m | 625k | 9h 52m 30s |
| 19 > 20 | 20 | 17.5m | 17.5m | 3.5m | 875k | 12h 20m 30s |
| 20 > 21 | 21 | |||||
| 21 > 22 | 22 | |||||
| 22 > 23 | 23 | |||||
| 23 > 24 | 24 | |||||
| 24 > 25 | 25 | |||||
| 25 > 26 | 26 | |||||
| 26 > 27 | 27 | |||||
| 27 > 28 | 28 |