Deconstruct

From OGame Wiki

Deconstruction is the downgrading of a building. Deconstruction happens one level at a time.

Structures on a Colony or Moon can be deconstructed by clicking on that structure from within the Buildings section.

Resources must be spent to remove a building, and the deconstruction takes a certain amount of time to complete. Not only do you not get any points for the resources spent on deconstructing, you also lose points from your score for all the points that that structure was worth.

Since the process is entirely wasteful, the only occasion that you would want to deconstruct a building is to free up fields on a colony. It is not necessary to deconstruct individual buildings if the complete destruction of a planet is your goal. To do so would only waste resources and time.

Both Interplanetary Missiles and Anti-ballistic Missiles can be deconstructed in the same fashion as buildings by clicking on the Missile Silo from the buildings section. Unlike buildings, deconstructing Interplanetary Missiles and Anti-ballistic Missiles is instant and costs no resources.