Iron Door is crafted from six iron ingots arranged in two vertical columns of three on the crafting grid, yielding three doors per recipe — the same ratio as wooden doors but using a much more expensive material. The visual is a heavy grey panel with rivets, paired with a metallic clunk on close.

The critical mechanical difference from wooden doors is that this variant cannot be opened by right-clicking. Players must apply a redstone signal — from a button, lever, pressure plate, or any other source — to make the door swing open. This makes it impossible for hostile mobs (zombies, raiders) to break through during a siege, since they cannot manipulate redstone, and equally impossible for unauthorised players to walk past without solving the redstone puzzle. Common applications include vault entrances, secret bases, mob trap kill chambers, and any structure where a wooden door's openness would be a liability. Like all doors, this one occupies two vertical blocks and tracks its open or closed state separately on each instance.