Simple Iron Farm: 3 Villagers, One Zombie, Iron Forever

Iron is the resource your base drinks constantly — hoppers, rails, anvils, beacons. An iron farm turns three villagers and one zombie into a steady stream of ingots while you do literally anything else. It's the first real farm every survival world should build.

Why an iron farm first

• Zero upkeep: no planting, no breeding, no fuel. It runs 24/7 in loaded chunks.
• Cheapest automation in the game: a few stacks of blocks, three beds, water and a hopper.
• Feeds everything else: hoppers for farms, anvil repair for Mending gear, iron golem… irony. You'll never mine iron again.
• Bonus poppies: golems drop them. Free decoration for your villager hall.

How golem spawning actually works

Iron golems spawn to protect villages. In Java Edition (unchanged through 1.21), the trigger is:

• A villager who has slept in the last 20 minutes and sees a zombie panics — panic triggers a golem spawn attempt (gossip between villagers triggers it too).
• The game tries to spawn a golem in a 16×6×16 box around that villager. If every other spot is blocked, the only valid spawn space is wherever you designed it — the farm platform.
• Golems drop 3–5 iron ingots (plus a poppy) when killed.

The 3-villager build, step by step

This is the classic compact design. Total materials: ~2 stacks of blocks, 3 beds, 3 villagers, 1 zombie, 2 water buckets, 1 lava bucket, 1 hopper, 1 chest, some glass.

1. Pick the spot: 64+ blocks from your base and any other village (see placement rules). Build a small support tower or a floating platform 10–20 blocks above flat ground — fewer valid spawn spots nearby, the better.
2. Build the spawning platform: a solid slab-level platform about 5×5, with a two-block-high open space above it (golems are big). No grass, no carpet, no flowers — golems must not be able to spawn anywhere else.
3. Line the edges with water: place water streams around the platform edges flowing toward one corner. Golems can't swim against a current and will drift where you want.
4. Villager pods in the middle: carve three small alcoves along one side. In each: one bed + one villager, fenced in so they can see the zombie but can't wander.
5. The zombie: dig a hole in the center of the platform, drop a zombie in, and cap it with glass or trapdoor the villagers can see through. Name-tag it so it doesn't despawn.
6. The kill chamber: where the water meets, golems fall one block into a collection pit. At head height, place a lava blade (a single lava source held back by a sign or trapdoor). Lava at head height kills the golem; the drops fall through into water below.
7. Collection: a hopper in the pit floor feeds a double chest. Done. Iron now accrues while you sleep in-game (the villagers will too — that's the point).

Placement rules (don't skip)

• 64+ blocks from every other bed, job block and villager — otherwise the game thinks your farm is part of another village and spawns golems there instead (or nowhere).
• Light up the surroundings: any dark surface under the platform is a mob farm you didn't ask for. Slabs or light stop zombie party-crashers near the pods.
• Keep it loaded: the farm only runs in loaded chunks. Build it near your base or AFK in range (the spawn box + 32 blocks covers it).
• No carpets/pressure plates on the platform: they block golem spawns. Plain solid blocks only.

Rates & upgrades

• Compact 3-villager design: a few hundred iron per hour — plenty for a survival base's hopper and anvil appetite.
• More pods = more attempts: scaling to 6–10 villagers in the same footprint roughly scales output toward and past 1,000/hour in popular designs.
• Two farms beat one giant farm: a second farm 64+ blocks away is easier than debugging one mega-structure.
• Stack a second collection floor only if you like plumbing. Water physics do the work for you the first time.

Rates at a glance (survival-tested)

Measured yields from a vanilla Java 1.21 world, single-player, farm fully loaded and you standing in range:

Farm not working? Check these five

1. Villagers haven't slept: they need to have slept within the last 20 minutes. Beds blocked by a block above? Fix that first.
2. Zombie can't be seen: villagers panic only if they can actually see it. Glass, not opaque blocks, over the zombie pit.
3. Zombie despawned: unnamed zombies vanish. Name tag it through the glass with a nametag… or swap in a fresh zombie and name it this time.
4. Golems spawning elsewhere: a stray bed or workstation within 64 blocks splits the "village". Search and remove.
5. Platform blocked: carpets, buttons, torches on spawnable blocks, or water everywhere except the drop — golems need a legitimate bare spot.

FAQ

Do I need to breed the villagers?

Not for the 3-villager design. Breeding matters if you later scale up or run a trading hall — see our Villager Trading Guide.

Will the zombie hurt the villagers?

Not through glass or a proper gap. Keep a full solid block or glass layer between them — they need line of sight, not touch.

Does this work on Bedrock Edition?

Bedrock golem spawning differs (villagers spawn golems differently and random spawn mechanics vary). This design targets Java; Bedrock farms use similar pods but different spawn rules — check a Bedrock-specific design.

Why is my AFK spot important?

Golems spawn around the villagers, but drops need the chunks loaded and your position within ~128 blocks for entities to tick. Stand within range or the chest quietly stops filling.

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