This article is about the building armor class. For general information about buildings in Age of Empires II, see Buildings (Age of Empires II). |

A Market, a "generic" armor class building.
The building armor class, sometimes referred to as Class 11 armor,[1] is an armor class in Age of Empires II. All units that have an attack bonus against this class deal bonus damage against buildings with this armor class.
This armor class primarily relates to enabling attack bonuses from naval and siege damage. This building armor class is not to be confused with the standard building armor class, which also contains all buildings (bar the Wonder), but takes bonus damage from different units and is affected by other technologies and bonuses. The purpose of having two different armor classes for buildings is to keep Masonry, Architecture, and the base building armor Castles and Walls have from cancelling the attack bonuses infantry units hold against buildings.
Buildings[]
The following buildings have the buildings armor class and take bonus damage from attacks against this class. The number in brackets indicates the amount of armor. If there is no number, the amount is 0.
House
Town Center
Mill
Farm
Lumber Camp
Mining Camp
Market
Blacksmith
University
Monastery
Dock
Barracks
Archery Range
Stable
Siege Workshop
Palisade Wall
Palisade Gate
Stone Wall (16)
Fortified Wall (24)
Gate (20)
Outpost
Watch Tower
Guard Tower
Keep
Bombard Tower
Castle (8)
Donjon (Sicilians only)
Krepost (8) (Bulgarians only)
Feitoria (Portuguese only)
Harbor (Malay only)
Folwark (Poles only)
Caravanserai (Hindustanis only)
Wonder
Anti-building units[]
The following units have an attack bonus against the building armor class. They are sorted descending by the amount of bonus damage they deal.
+500 bonus attack
+280 bonus attack
+275 bonus attack
+250 bonus attack
+220 bonus attack
+200 bonus attack
+180 bonus attack
+150 bonus attack
+125 bonus attack
+105 bonus attack
+75 bonus attack
+60 bonus attack
+45 bonus attack
+35 bonus attack
+10 bonus attack
Elite War Elephant (Persians only)
Elite Tarkan (Huns only)
+9 bonus attack
Elite Caravel (Portuguese only)
Thirisadai (Dravidians only)
+8 bonus attack
Tarkan (Huns only)
Galleon
Elite Longboat (Vikings only)
Caravel (Portuguese only)
+7 bonus attack
War Elephant (Persians only)
War Galley
Longboat (Vikings only)
Elite Battle Elephant (+10 before update 42848)
+6 bonus attack
+5 bonus attack
+4 bonus attack
Heavy Scorpion
Elite Ballista Elephant (Khmer only)
Battle Elephant (+7 before update 42848)
+3 bonus attack
+2 bonus attack
Scorpion
Elite Conquistador (Spanish only)
Ballista Elephant (Khmer only)
Fire Ship
Elite Hussite Wagon (Bohemians only)
+1 bonus attack
Fire Galley
Hussite Wagon (Bohemians only)
Technologies[]
The following technologies give the following units an attack bonus against the building armor class:
Siege Engineers
- +200 bonus attack
- +50 bonus attack
- +40 bonus attack
- +30 bonus attack
- +25 bonus attack
- +12 bonus attack
- +9 bonus attack
- +7 bonus attack
- +1 bonus attack
Sappers
- +15 bonus attack
Counterweights (Saracens only)
- +38 bonus attack
- +9 bonus attack
- +7 bonus attack
- +5 bonus attack
The following technologies give all buildings additional armor against bonus damage:
Masonry
- +3 bonus armor
Architecture
- +3 bonus armor
Civilization bonuses[]
- The following Burgundian units get an attack bonus against the building armor class:
- +69 bonus attack
- +50 bonus attack
- The following Gurjara units get an attack bonus against the building armor class:
- +53 bonus attack
- +38 bonus attack
- ↑ This refers to its value in the game files. See Masonry, Architecture, and Building Armor in AoE2 Spirit of the Law 2019.