If you do not need a building any more, you can order your builders to demolish it. This requires a main building at level 10 or above.
To remove a building you have three possibilities within the main building:
- Level by level with the respective destruction time
- Level by level by using the Gold instant completion feature to finish it without any destruction time
- The complete building at once by using the implemented Gold instant complete destruction feature
You can also catapult your own village to demolish the buildings.
A final possibility is to get a friend, ally or neighbour to attack your village with catapults, as a quick and cheap way to clear a village.