This page documents the layer-by-layer composition of a given generated structure, terrain feature, or feature.
Small doors are the separating sub-structures that generate between the various rooms in strongholds.
There are 4 types of door: the plain empty 3×3 opening, the grates of iron bars, the wood door and the iron door. They are generated randomly, with equal chance between them except for the empty opening which is twice as likely. They are generated only as entrances of rooms: this way the game prevents double back-to-back doors from generating (as exit of one room plus entrance of the subsequent room).
The wood and iron doors always face the direction the stronghold generates toward, meaning a door flush with the wall always leads away from the starting staircase, and a door indented into the wall leads toward the starting staircase.
Datapack Codex — The all-versions Minecraft data pack reference. Community reference; not affiliated with Mojang Studios or Microsoft. “Minecraft” is a trademark of Mojang Synergies AB.
Primary syntax targets Minecraft Java Edition 1.21+ (singular folder names). Version-specific behaviour is flagged inline and mapped on the pack_format history page.
