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Colonies are the core of RimWorld. They are the central base of operations for all colonists, allowing them a safe place to sleep, grow food, stockpile resources, trade with outside parties, research new technologies, and defend themselves from attackers. Without a well-designed colony to support them, your colonists will be left to the mercy of hunger, disease, marauding raiders, and even worse threats. This page is dedicated to colonies, especially colony placement and design.

Types of bases

In RimWorld, there are three types of colonies: underground bases, open ground colonies, and hybrid colonies.

  • Underground bases are colonies which have been built into a mountainside. The most prominent benefit of this is that enemies can only approach the base from its exterior entrance(s). This makes it highly defensible. It also means less exposure to the outside elements when dealing with especially hot or cold biomes. However, it also makes it trickier to obtain certain resources such as food and wood -- you may be forced to rely on hydroponics in certain inhospitable conditions.
  • Open ground colonies are built out in the open. The benefit of this is that they can be built anywhere, rather than requiring specific natural features to be built into. However, they require much more defending and are more susceptible to raider or mechanoid attacks.
  • Hybrid bases have some features of the two previous styles, mixing and matching according to the builder's needs.

Multiple Colonies

Since Alpha 16, you can have up to 5 colonies running at the same time (available in Options > Settings). The larger you extend the more benefits and difficulties you will gain. There`s no need to make them all primary bases but keep just one as main and the others as resource specific locations, for example to gather components only. However you will be susceptible to have all your colonies raided simultaneously.

Besides the vulnerability issue, another inconvenience will rise regarding foreign affairs, other faction`s visitors and traders will only enter one out of all your bases when your settlements are one next to the other. The problem that this generates is that your sale stock may not all be in the arriving location as well as your fundings, making it difficult to buy. This is still possible to overcome by sending your colonists on an immediate caravan to better interact with the others. There is no "bank transfers" that can wire your money to a central bank deposit or towards branches.

Once all aimed resources have been depleted out of an area, abandoning them to create additional bases will leave ruins on the map.

Abandoned faction base.png

Abandoned bases will also obstruct an exit of new bases built next to them.

Abandoned faction base obstruction.png