Minecraft wiki entry for Door, associated text: Doors are 0.1875 (3⁄16) blocks thick (0.1825 in Bedrock Edition). The rest of a door's space can be moved through freely. A door occupies two block spaces and both halves normally act as a single barrier, although doors can be opened or closed with a player or mob occupying the bottom block of the door,[1] in which case the player can jump up to land on the bottom half of the door and then again to land on top of the door.