First house, mob-proof
A good first house in Minecraft is a 7×7 to 9×9 footprint with walls 3 to 4 blocks high, one door and torches on every wall. Since the 1.18 update hostile mobs spawn only at block light level 0, so a torch every few metres is enough to keep the base safe.
| Material | Where you get it | Blast resistance | Typical use in a first house |
|---|---|---|---|
| Oak wood | Surface trees, wooden axe | Low (wood family) | Walls and roof of a starter house |
| Spruce wood | Taiga trees | Low (wood family) | Alternative wall look, same build speed |
| Cobblestone | Digging the foundation | 6 | Floor layer and exposed corners |
| Stone | Furnace-smelted cobblestone | 6 class | Smooth interior walls |
| Obsidian | Water meets lava source | 1,200 | Protective builds around base and portals |
| Bricks / concrete-like blocks | Crafted or gathered later | Above cobble class | Decorative upgrades after the first house |
Hostile mobs spawn only where the block light level is 0.
Since the 1.18 update the spawn rule is a single condition: a hostile mob appears only on a block whose light level is 0. There is no grace distance from your door and no exception for covered ground — darkness is the only trigger.
Light level is measured per block. A torch emits level 14, and the level drops by one for every block of distance from the source, so a wall lit at 14 near the torch reads 13 one block away, 12 two blocks away, and so on.
The practical consequence: any surface reading 1 or higher is safe. You only have to eliminate the spots that read 0, which usually means the far corners of a room and the stretch of path beyond the last torch.
Wood is the fastest to gather; stone and obsidian trade effort for blast resistance.
Overworld wood types include oak, spruce, birch, jungle, acacia, dark oak, mangrove, cherry and bamboo — nine options, all obtainable with a wooden axe in the first hour. Wood gives a warm look and burns through a build quickly.
Stone-based blocks raise protection. Cobblestone has a blast resistance of 6, which stops ordinary mobs but not explosions; obsidian resists 1,200, which is why it is used for protective builds around bases and portals.
For a first house, wood for walls and a stone or cobble floor is a balanced choice: cheap, fast, and good enough against everything except a creeper that reaches the wall.
7×7 to 9×9 blocks with walls 3 to 4 blocks high.
A practical first-house footprint is 7×7 to 9×9 blocks with walls 3 to 4 blocks high. Smaller than 7×7 and a bed, chest and crafting table crowd each other; larger than 9×9 and the lighting plan grows before you have the torches.
The buildable world height in current versions spans Y = -64 to Y = 320, so vertical space is never the constraint on a starter house — ground area and light coverage are.
At 3 blocks high the player can jump under a ceiling; at 4 blocks the room feels open and leaves a full block of headroom above a placed bed.
Only the release and update facts are dated; the build steps themselves follow the current version.
Each stage has one measurable target: footprint, wall height, roof count, light level.
Facts drawn from the game's release record, the 1.18 spawn rule, and the stated block and light-level figures.