The Garrison level is the overall level of a Garrison. As of the Warlords of Draenor Alpha, the level can range from 1 to 3 and should match the minimum building tier of all of your garrison buildings. Basically this means you have to upgrade all your buildings to increase your garrison level.
So far it is assumed you need to fill all your plots before you can increase your garrison level.
Advantages of increased garrison level Edit
- Level 1: 2 plots (1 large plot + 1 small plot)
- Level 2: 4 plots (1 large plot + 1 medium plot + 2 small plots) plus a Mine plot and an Herb Garden plot
- Level 3: 7 plots (2 large plots + 2 medium plots + 3 small plots) plus a Mine plot, an Herb Garden plot, and a Pet Menagerie plot