Constructions are buildings such as floors, walls, and stairs. They can be made of any solid material, including wood, stone, metal, glass, and even soap.
Constructed features cannot be smoothed, engraved, or carved into minecart tracks. In order to construct smooth stone walls and floors, blocks need to be used in place of raw stone.
The "Wall/Floor Construction" labor is required to make constructions, and "construction removal" labor to remove them.