Building a base in SCUM is about more than a roof over your head. It is your storage vault, your respawn anchor and your defense against other players who would happily relieve you of everything you have looted. The system revolves around one object above all others: the flag. Get the flag right and the rest of your base falls into place. This guide walks through flags, modular elements, wall tiers, locks, maintenance and the raid-protection settings that decide whether your hard work survives the night.
One important caveat first: SCUM is in active development and its base-building numbers change between updates. The mechanics and defaults below are drawn from the official SCUM Wiki and the public server-settings reference, but treat any specific figure as version-dependent and confirm it against your own server before you commit to a layout.
The flag is the heart of your base
Placing a flag is the first real step in building a base. The flag claims a section of the map and shows a visual radius that marks your working space. Within that radius the flag prevents other players from building, and it stops them from locking or claiming doors. Almost every other blueprint must be placed inside the flag’s radius to be built at all. The notable exceptions are chests, fire rings, improvised beds and shelters, which you can place out in the open without a flag.
The flag is also your maintenance and repair hub. With a toolbox you can repair player-built structures from a single location, and simply being present keeps the base alive (more on maintenance below). The flag itself is classed as a non-modular, Tier 0 element with no HP value and no storage of its own, so its value is entirely in the protection and territory it grants.
The element limit and squad scaling
A single flag does not let you build forever. By default a flag can contain 100 modular base elements for a one-player squad. The limit increases as you add squad members, so a full team can raise a far larger compound than a solo player. The cap applies specifically to modular base building elements, the snap-together pieces that form the structure of a base, and it exists partly for server performance and partly as a gameplay signal: a sprawling base advertises a team-sized stockpile of loot.
Plan around this limit early. If you intend to build large stone or concrete walls, count your foundations, frames and walls so you do not hit the cap with half a perimeter left to close.
Wall tiers and the upgrade system
SCUM uses a tiered material progression rather than letting you jump straight to the strongest walls. According to the wiki you cannot immediately build metal walls; you start basic and upgrade up. The upgrade itself is done by holding F on an existing piece and selecting upgrade, which spawns a new blueprint to fill with the higher-tier materials. The same upgrade flow applies to towers, doors and doorframes, and on uneven ground walls tile into smaller chunks that you upgrade chunk by chunk. Spikes can be added to walls to deter players from jumping over them.
| Wall type | Engineering requirement | Role |
|---|---|---|
| Wooden | No skill required | Starter perimeter, cheap and fast |
| Barbed | Basic engineering | Adds deterrent over plain wood |
| Metal | Medium engineering | Mid-tier durability upgrade |
| Brick | Advanced engineering | Hardened against raiding tools |
| Concrete | Advanced engineering | Top-tier defense, hardest to breach |
There are several wall sizes with differing HP and material costs, and higher-tier elements support more stability on top of them, which matters when you stack multiple floors. Brick and concrete were introduced specifically as sturdier layers that make explosive raiding less trivial. If you have older legacy base elements from past versions, they remain in place and your gear stays protected, but they have been removed as a crafting option and will degrade over time, so rebuild in the modern tiers when you can.
Doors, locks and access control
Doors are your day-to-day security. The wiki lists three lock tiers in ascending security: Rusty Lock, Basic Lock and Gold Lock. You can fit up to five locks on a single door, which slows a lockpicker considerably, while a vehicle accepts a maximum of one lock. Stack better locks on the door that guards your most valuable storage, and remember that doors and doorframes upgrade through the same hold-F system as walls, so a wooden door on a concrete wall is the weak point a raider will look for.
Where you can build
Beyond the flag-radius requirement, where you can build depends on the server. The setting UseMapBaseBuildingRestriction enables map-based no-build zones, and there are spacing rules that stop some elements from being placed too close to the flag itself. On servers that use restrictions, areas around key points of interest can be off-limits, so if a foundation refuses to place with an “area restricted” message, you are likely inside a no-build zone rather than hitting a bug. Pick a spot with cover, water access and a clear approach you can watch from inside your walls.
Maintenance: don’t let your base decay
Bases decay if neglected. The wiki states you must maintain buildings at least once every 14 days, and everything inside a flag’s area is maintained automatically when you enter the flag zone. On the server side, decay is governed by BaseElementsDecayRateMultiplier, applied against a default base-element decay rate of 672 hours (that is the 14-day figure). Setting the multiplier to 0 disables decay entirely, which many community servers do, so check your server before you assume the clock is ticking.
Raid protection and flag overtake
Raid protection is configured per server through a small set of settings. The headline values from the public reference are below; defaults differ by server and these are version-dependent.
| Setting | What it controls | Reference default |
|---|---|---|
| RaidProtectionType | 0 off, 1 offline, 2 flag-specific, 3 global | 0 (off) |
| RaidProtectionFlagSpecificMaxProtectionTime | Max flag-specific protection window | 8 hours |
| RaidProtectionOfflineProtectionStartDelay | Vulnerable window after last player logs out | 30 minutes |
| FlagOvertakeDuration | Time to capture an enemy flag | 24 hours |
The takeaway: on a server with offline raid protection, a short delay leaves you briefly vulnerable after the last squad member logs off, then protection kicks in. Flag overtake means a determined raider can claim your flag over a long capture timer rather than only blasting through walls, which is why guarding the flag and its surroundings is as important as the walls themselves.
Defending a base in practice
- Upgrade to brick or concrete on the outer shell, since these tiers were added specifically to blunt explosive raiding.
- Layer locks on your inner storage door, up to the five-lock maximum, and never leave a wooden door in a stone wall.
- Build defense in depth so a raider who breaches the outer wall still faces an inner layer before reaching loot.
- Protect the flag’s footprint; losing the flag through overtake can hand over everything inside its radius.
- Keep within the maintenance window unless your server has decay disabled.
Bases are far more rewarding to build and defend with a crew, and squad size directly raises your element limit. If you want a persistent world where your walls and stored loot survive between sessions, running your own SCUM server with friends lets you tune raid protection, decay and overtake timers exactly how your group likes them. For step-by-step setup and config help, the SCUM server documentation covers the practical side.
Frequently asked questions
How many base elements can one flag hold?
By default a single flag holds 100 modular base elements for a one-player squad, and the limit increases as you add squad members. The cap applies to modular elements specifically and can vary by server version.
Can I build metal or concrete walls straight away?
No. The wiki confirms you start with basic walls and upgrade upward by holding F and filling a new blueprint. Higher tiers also gate behind engineering skill, with brick and concrete requiring advanced engineering.
What happens if I stop logging in?
On servers with decay enabled, you must maintain your base at least once every 14 days; entering the flag zone maintains everything inside it automatically. Many servers disable decay via the decay-rate multiplier, so confirm your server’s setting.
New to the island? Start with our SCUM Beginners Guide and keep yourself alive with the SCUM Metabolism Guide. To kit out your base defenders, read the SCUM Best Weapons Guide and learn where to stock up in the SCUM Best Loot Locations guide.
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