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Basements and bunkers

Build 42 added floors below ground: basements, bunkers, panic rooms and secret complexes. This page covers how they are placed, how to find them, what you will find inside and how to use one as a base. Updated for Build 42.21 Stable and 42.22 Pre-Release, November 2026.

A dark interior
Bring a light: basements are pitch black · Official image, The Indie Stone
01Part

How basements work

The Indie Stone described two kinds in its “Cellar Door-doid” post (October 2023):

  • Permanent basements belong to fixed places: landmarks, businesses and secret military complexes.
  • Randomised basements are placed at world creation in houses that can fit one: ordinary basements, bunkers, panic rooms and fully furnished sets. 119 had been designed at the time of that post.

A sandbox option sets how often random basements appear, so two worlds will not have them in the same houses. Some are empty, some are full of loot and some hint at what happened to the owner.

02Part

Spotting an entrance

There is no icon. Look for stairs leading down, or an extra interior door that does not open onto a normal room. Bigger detached houses, workshops, lodges and some commercial and public buildings are the best bets; small tract houses rarely have one. One guide estimates you will check five to ten buildings in a neighbourhood before finding one (one source). You always enter from the building above. Town-by-town tips are on loot locations.

03Part

What you find underground

More likelyLess likely
Workshop tools, preserved food, mechanical and electrical parts, occasional ammo caches and locked stash roomsFresh food, clothing and medicine (loot those upstairs)

From one guide (one source). Zombies inside are normal zombies; the danger is the cramped corridors, blind corners and sometimes a tight cluster. Noise carries in enclosed rooms, so a gunshot can wake the next room. Tools are on every tool.

04Part

Light

Basements are almost completely dark. Without a light you may not see a zombie until it is in arm’s reach, and low light also hurts your aim. Carry a flashlight in your off hand and spare batteries, or two light sources. Since 42.20 one guide warns that crafting in an unlit basement is error-prone; light the room first. Lighting gear is on generators.

05Part

Living in a basement

Opinion A cleared basement makes a strong late-game workshop or storeroom: no windows to watch, one way in, and you barricade the door upstairs. It is a poor first base, because the single exit becomes a trap if a horde comes through the house. Keep your bed somewhere you can escape from, and use the basement for the forge, kiln and stores. Fortifying the house above is on base building.

06Part

Our take: a five-minute basement check

  1. Listen first. Stand at the top of the stairs for a few seconds. Enclosed rooms carry sound, and a groan below tells you more than going down blind.
  2. Light in the off hand. Go down with the light already on and your weapon ready, never with your hands full of loot.
  3. Clear, then loot. Check every corner and side room before opening a container. Blind corners are where basements kill people.
  4. Mind the exit. There is only one way out: the stairs you came down. Do not let a crowd form upstairs while you are below.
  5. Take the heavy stuff. Basements lean toward tools, parts and preserved food, so bring a bag with room to spare.

If you plan to live in one, remember the same single exit works both ways: it is easy to defend and easy to get trapped in.

07Part

Quick answers

Are basements random in Project Zomboid?

Some are fixed to landmarks and businesses; others are placed at random in suitable houses when the world is created.

How do I find a basement?

Look for stairs going down or a door that does not lead to a normal room, mostly in bigger houses and workshops.

Can I turn off basements?

A sandbox option controls how often random basements appear.

Is a basement a good base?

It is safe and windowless, but it has one exit, so it suits a workshop better than a bedroom.

Basement types come from The Indie Stone; looting tips and odds come from one fan guide and are marked. Sources: The Indie Stone: Cellar Door-doid · LootLore basement raids. Your game is the final word: if it disagrees with us, tell us and we will fix the page.

Do this first

  1. Carry a flashlight and spare batteries.
  2. Check bigger houses for a door that leads down.
  3. Clear it with a melee weapon, not a gun.
  4. Barricade the door upstairs.

Knowledge Base: world

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