The Construction skill has a significant effect on the speed of deconstructing an object. Deconstruction will increase Construction skill.
In most cases, deconstructing a building will give a refund of 50% of the build cost of the item, rounded up. This can be useful when resources are desperately needed or structures are no longer required. Existing ruins can be deconstructed for free building materials.
While it is under the Construction work type, deconstruction is given a lower priority within the task, and therefore takes place after all construction has been completed.