forcedelete command

Force-removes every object within the radius around you, or only objects matching a prefab name if you give one. The in-game help itself says to make backups first, and it means it: there's no undo, and buildings count as objects. Needs devcommands, and admin rights on a server.

Cheat commands need the console enabled with the -console launch option, then devcommands typed once. They work in singleplayer or when you host, not on dedicated servers.

Back up the world before using it near anything you want to keep. Radius caps at 50.