Copy Building Key is a general crafting recipe in Project Zomboid Build 42. It makes Key x1. It needs no skill level.
| Qty | Item | How it is used |
|---|---|---|
| 1 | any smallfiles | Tool, kept (may wear) |
| 1 | any buildingkey | Tool, kept |
| 1 | Blank Key | Used up |
| Qty | Makes |
|---|---|
| 1 | Key |
Use the Copy Building Key recipe (General category). You need Blank Key and these tools: any smallfiles, any buildingkey.
No skill level is required.
You must learn this recipe before it shows in the crafting menu. Reading Magazine: The Cheapskate's John Spiral - Escaping Captivity teaches it.
Figures on this page are read from the Build 42 game files (42.22, November 2026). Chances are relative weights inside each loot table, not exact drop rates. Your game is the final word: if it disagrees with us, tell us and we will fix the page.