Castle upgrade requirements

Upgrading your castle level requires specific buildings to have been constructed first. The list below is a comprehensive list of all requirements for each castle level.

Upgrade	Level	Required Building 1	Required Building 2	Level
Castle 3	Wall level 2	Lumber Mill		2
Castle 4	Wall level 3	Quarry		3
Castle 5	Wall level 4	Farm		4
Castle 6	Wall level 5	Bowmen Barracks 6		5
Castle 7	Wall level 6	Hospital		6
Castle 8	Wall level 7	Shieldmen Barracks		7
Castle 9	Wall level 8	Academy		8
Castle 10	Wall level 9	Cavalry Barracks		9
Castle 11	Wall level 10	Warehouse		10
Castle 12	Wall level 11	Spearmen Barracks		11
Castle 13	Wall level 12	Wishing Fountain		12
Castle 14	Wall level 13	Dwelling		13
Castle 15	Wall level 14	Tower of Knowledge		14
Castle 16	Wall level 15	Bowmen Barracks		15
Castle 17	Wall level 16	Hospital		16
Castle 18	Wall level 17	Shieldmen Barracks		17
Castle 19	Wall level 18	Academy		18
Castle 20	Wall level 19	Cavalry Barracks		19
Castle 21	Wall level 20	Warehouse		20
Castle 22	Wall level 21	Spearmen Barracks		21
Castle 23	Wall level 22	Wishing Fountain		22
Castle 24	Wall level 23	Tower of Knowledge		23
Castle 25	Wall level 24	The Forge		24
Castle 26	Wall level 25	Hospital	Bowmen Barracks	25
Castle 27	Wall level 26	Academy	Shieldmen Barracks	26
Castle 28	Wall level 27	Cavalry Barracks	Warehouse	27
Castle 29	Wall level 28	Spearmen Barracks	Wishing Fountain	28
Castle 30	Wall level 29	Tower of Knowledge	The Forge	29
Castle 31	Wall level 30	Hospital	Bowmen Barracks	30
Castle 32	Wall level 31	Academy	Shieldmen Barracks	31
Castle 33	Wall level 32	Cavalry Barracks	Warehouse	32
Castle 34	Wall level 33	Spearmen Barracks	Wishing Fountain	33
Castle 35	Wall level 34	Tower of Knowledge	The Forge	34
Castle 36	Wall level 35	Hospital	Bowmen Barracks	35
Castle 37	Wall level 36	Academy	Shieldmen Barracks	36
Castle 38	Wall level 37	Cavalry Barracks	Warehouse	37
Castle 39	Wall level 38	Spearmen Barracks	Wishing Fountain	38
Castle 40	Wall level 39	Tower of Knowledge	The Forge	39
Castle 41	Wall level 40	Hospital	Bowmen Barracks	40
Castle 42	Wall level 41	Academy	Shieldmen Barracks	41
Castle 43	Wall level 42	Cavalry Barracks	Warehouse	42
Castle 44	Wall level 43	Spearmen Barracks	Wishing Fountain	43
Castle 45	Wall level 44	Tower of Knowledge	The Forge	44
Castle 46	Wall level 45	Hospital	Bowmen Barracks	45
Castle 47	Wall level 46	Academy	Shieldmen Barracks	46
Castle 48	Wall level 47	Cavalry Barracks	Warehouse	47
Castle 49	Wall level 48	Spearmen Barracks	Wishing Fountain	48
Castle 50	Wall level 49	Tower of Knowledge	The Forge	49

As of patch 2.6 released july 2023, we have an increased building cap of level 55. Among the numerous elements of Castle Level 55, one aspect that demands attention is the building costs. This crucial information sets the stage for players’ resource management skills to shine. The infographic reveals the intricate details of wood, iron, stone, and the newly introduced resource, aether, required for constructing and upgrading buildings. Mastering these costs will be the key to unlocking the full potential of your castle. Moreover, what we need to know are the Building Requirements which is what this page is all about! Quite interestingly the new builds seem to follow the logic of the older tiers.

The upgrade requirements are:

Castle 51	Wall level 50	Hospital	Bowmen Barracks	50
Castle 52	Wall level 51	Shieldmen Barracks	Academy	51
Castle 53	Wall level 52	Cavalry Barracks	Warehouse	52
Castle 54	Wall level 53	Spearmen Barracks	Wishing Fountain	53
Castle 55	Wall level 54	Tower of Knowledge	Forge	54

For more information regarding the resource costs of each level of Castle as well as every other building in Infinity Kingdom, have a look here.

Published: 11-07-2023