The warehouse stores your resources. The higher its level the more resources can be stored. The maximum level of the Warehouse (Like many buildings) is 30.
If your warehouse gets full you cannot gain anymore resources for that amount.
E.G. lets say your warehouse can hold 10000 resources.
If you have 10000 iron, 5000 wood and 9000 clay, you cannot gain anymore iron, however you can get 5000 more wood and 1000 more clay.
It is usually considered wasteful to build your warehouse up faster than your income (either from resource pits or through farming) and your HeadQuarters Building, as the resources used to build all that extra space could be used for more troops, or building up other builds.
In Packet worlds, a level 24 warehouse is requried in order to build your Level 3 Academy. Anything higher than that is only necessary if you farm resources faster than you can use them.
To get more resources in your Warehouse, increase its level:
| Level | Requirements | Capacity |
|---|---|---|
| 1 |  60  50  40
|
1000 |
| 2 | 76 64 50
|
1229 |
| 3 | 96 81 62
|
1512 |
| 4 | 121 102 77
|
1859 |
| 5 | 154 130 96
|
2285 |
| 6 | 194 165 120
|
2810 |
| 7 | 246 210 149
|
3454 |
| 8 | 311 266 185
|
4247 |
| 9 | 393 338 231
|
5222 |
| 10 | 498 430 287
|
6420 |
| 11 | 630 546 358
|
7893 |
| 12 | 796 693 446
|
9705 |
| 13 | 1.007 880 555
|
11932 |
| 14 | 1.274 1.118 691
|
14670 |
| 15 | 1.612 1.420 860
|
18037 |
| 16 | 2.039 1.803 1.071
|
22177 |
| 17 | 2.580 2.290 1.333
|
27266 |
| 18 | 3.264 2.908 1.659
|
33523 |
| 19 | 4.128 3.693 2.066
|
41217 |
| 20 | 5.222 4.691 2.572
|
50675 |
| 21 | 6.606 5.957 3.202
|
62305 |
| 22 | 8.357 7.566 3.987
|
76604 |
| 23 | 10.572 9.608 4.963
|
94184 |
| 24 | 13.373 12.203 6.180
|
115798 |
| 25 | 16.917 15.497 7.694
|
142373 |
| 26 | 21.400 19.682 9.578
|
175047 |
| 27 | 27.071 24.996 11.925
|
215219 |
| 28 | 34.245 31.745 14.847
|
264611 |
| 29 | 43.320 40.316 18.484
|
325337 |
| 30 | 54.799 51.201 23.013
|
400000 |
Resources are used to build buildings and train troops.