Wooden door

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• Utility:
• Requirement: 5 woods.
• Notes: Wooden Jam required. Doors can be destroyed by melee weapons.

Upgrade 1 (F6): Bronze Door

• Utility: Stronger that wooden door
• Requirement: 5 woods + 15 Bronze ingots
• Notes: Wooden Jam upgraded required. Doors can be destroyed by bronze/steel weapons (and siege)

Upgrade 3 (F6): Steel Door

• Utility: Stronger that bronze door
• Requirement: 50 Steel ingots
• Notes: Wooden Jam upgraded required. Doors can be destroyed by steel weapons only (and siege)

Doors don’t have health points, they have a 'chance to destroy' and it looks like this: Average amount of hits needed to destroy wooden/bronze/steel doors based on chance percentage (modification 0.19, 29 aug):

• Chipped Stone 200/0/0
• Stone Axe 33/0/0
• Bone Axe 25/0/0
• Bronze Axe 20/140/0
• Steel Axe 14/100/214
• Obsidian Axe 14/100/214