| ||For an overview of vault doors in the Fallout series, see Vault door.|
|The following is based on Fallout Shelter and some details might contradict canon.|
The vault door can hold up to two dwellers as an initial defense. It can be upgraded two times to strengthen the door against raider attacks. The door is a fixed entry point to the vault and cannot be constructed or demolished. As such, it is the only room that is unavailable in the construction menu.
- Upgrade 1: 500 bottle caps
- Upgrade 2: 2000 bottle caps
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