This article is for the PC version of Stellaris only.
Terraforming is the act of changing the planet classification of a celestial body in order to make it more habitable for the empire's citizens. Terraforming also removes all tile blockers from the surface, as well as a subset of planet modifiers. The base technologies requires significant society research to unlock, while each terraforming project requires significant amounts of energy credits, and time.
Terraforming is started via a button on the World Detail view. The world must be surveyed and within your borders. Only habitable-type worlds, Tomb Worlds, and special Barren Worlds that have the rare "Terraforming Candidate" modifier can be terraformed. The expansion planner screen can be used to find these rare candidates.
The requirements for terraforming a world depend on the magnitude of the change. A change within the same climate (wet, cold, dry) is faster and cheaper than a change between climates. Barren worlds are considered to be closer to Dry or Cold Climate, depending on the subtype.
|Change||Technology, Ascension Perk or Modifier required||Cost||Years|
|Within same climate||Terrestrial Sculpting||2000||5|
|Different climate||Terrestrial Sculpting||5000||10|
|Wet, Cold or Dry to Gaia||Terrestrial Sculpting and World Shaper Ascension Perk||10000||20|
|Wet, Cold, Dry, Gaia, Tomb or Hive World to Machine World||Terrestrial Sculpting and Machine Worlds Ascension Perk||10000||20|
|Wet, Cold, Dry, Gaia, Tomb or Machine World to Hive World||Terrestrial Sculpting and Hive Worlds Ascension Perk||10000||20|
|Machine World to any Wet, Cold or Dry||Climate Restoration||10000||20|
|Hive World to any Wet, Cold or Dry||Climate Restoration||10000||20|
|Tomb to any Wet, Cold or Dry||Climate Restoration||10000||20|
|Barren to any Dry||Climate Restoration and Terraforming Candidate Modifier||5000||10|
|Barren to any Wet||Climate Restoration and Terraforming Candidate Modifier||10000||15|
|Barren to any Cold||Climate Restoration and Terraforming Candidate Modifier||15000||20|
|Frozen Barren to any Cold||Climate Restoration and Terraforming Candidate Modifier||5000||10|
|Frozen Barren to any Wet||Climate Restoration and Terraforming Candidate Modifier||10000||15|
|Frozen Barren to any Dry||Climate Restoration and Terraforming Candidate Modifier||15000||20|
Several planet modifiers are permanently removed after terraforming. The following modifiers are always lost when terraforming a planet:
When and if terraforming a planet to Hive or Machine World, keep in mind that all planetary features, including rare ones that give access to rare resources and even event spawned ones (such as Odd Factory), will always be removed.
Cost reduction & SpeedEdit
Alternatives to terraformingEdit
Terraforming is only one way to allow a species to better live on a planet. Other methods include gene tailoring species to have a specific climate preference via the Glandular Acclimation technology or using synthetics to colonize otherwise uninhabitable worlds.