Cobblestone, Forge & Stone Tier Progression
Cobblestone is the gateway resource for everything past wooden tools in 7 Days to Die. You need it for the Forge, you need it to upgrade wood blocks to stronger walls, and you can't skip it — the game gates iron-tier crafting behind it.
Cobblestone Rocks — The Recipe
| Output | Inputs | Where to Craft |
|---|
| 1 Cobblestone Rock | 1 Small Stone + 1 Clay Soil | Inventory crafting OR Workbench |
That's it. Two raw resources you already have on Day 1. The recipe lives under the Resources tab in your inventory crafting menu.
Where to Get the Inputs
Small Stones
- Pick up rocks from the ground — tiny rocks scattered everywhere. 5-15 rocks per stop.
- Break large boulders with a Stone Axe or Iron Pick — gives Small Stones plus traces of iron and lead.
- Loot zombie corpses — occasional small stone drops.
- Target: 200+ Small Stones early on so you have a buffer.
Clay Soil
- Dig with a Shovel on dirt blocks — primary source.
- Forest biome soil is easiest to identify (lighter brown).
- Don't bother with desert sand — it doesn't produce Clay Soil.
- Yields about 4-6 Clay Soil per dirt block dug.
What Cobblestone Unlocks
1. The Forge
The Forge is the second-tier crafting station you absolutely need. It melts ore into ingots, smelts glass, and produces every iron-tier component.
| Item | Materials Required |
|---|
| Forge | 15 Cobblestone Rock + 8 Wood + 5 Leather + 2 Short Iron Pipe |
The Forge crafting recipe unlocks at character level 5 with the Advanced Engineering perk — or you can find a Schematic.
2. Cobblestone Block (Wall Upgrade)
The most strategic use of Cobblestone Rocks: upgrading your wooden walls into stone.
- Place Wood Frames (or upgrade existing wood blocks).
- Equip a Stone Axe or Claw Hammer.
- Right-click (secondary action) on a wood block while holding the upgrade tool.
- Each wood-to-cobblestone upgrade costs 10 Cobblestone Rocks.
- Cobblestone is roughly 3× more durable than wood — survives many more zombie hits.
3. Concrete Tier
Cobblestone is the prerequisite for concrete. The full progression:
| Tier | Material | Durability vs Wood |
|---|
| 1 (Wood) | Wood Frame → Wood Block | 1× (baseline) |
| 2 (Cobble) | Cobblestone Block | ~3× |
| 3 (Concrete) | Reinforced Concrete | ~6× |
| 4 (Steel) | Steel Block | ~12× |
You can't skip cobblestone. To upgrade wood → concrete, you must pass through the cobblestone tier first.
How to Build a Forge (Step-by-Step)
- Stockpile materials — 15 Cobblestone Rocks, 8 Wood, 5 Leather (loot dead animals or zombies), 2 Short Iron Pipe (loot from cars/houses).
- Reach character level 5+ and unlock Advanced Engineering perk OR find a Forge schematic in loot.
- Open inventory, click Craft, find Forge under workstations.
- Wait for the craft (about 30 seconds in-game).
- Place the Forge in your base — needs an open space; air vent on top.
- Add fuel (wood, coal, or oil) to the Forge.
- Add raw materials (iron ore, lead ore, etc.) to the input slot.
- Light the Forge — it takes time to smelt.
Optimal Cobblestone Production Workflow
- Mine boulders early — aim for 500+ Small Stones in one trip.
- Dig dirt patches with a Shovel — aim for 100+ Clay Soil.
- Craft 100+ Cobblestone Rocks while you sleep / wait between activities.
- Build the Forge first (15 rocks).
- Use the rest to upgrade wooden walls (10 rocks each → ~8 walls per 100 rocks).
Common Mistakes
- Trying to build a Forge with raw stones (won't work) — you need Cobblestone Rocks specifically.
- Skipping cobblestone walls — horde night will break wooden walls in seconds.
- Mining sand instead of dirt for Clay Soil — sand doesn't drop Clay.
- Ignoring the Workbench upgrade — once you have a Workbench, cobblestone crafts faster and in batches.
Build the right way. Host a 7 Days to Die server with the team behind this wiki and run progression at server-side speeds.