The house was not transferred, the contract was not signed, and the money was not received. Can buyers be driven away?

Of course, you can let him leave, and you don't have to pay the decoration fee at the same time. You can also talk to the other party about the renovation and demolition and restore to the original state. Because the house has not been transferred, it still belongs to you, so the other party cannot dispose of it at will. If you need to make corresponding changes, you must ask for your consent. At present, don't say whether you agree with his decoration, even if you agree verbally, if there is no evidence to prove it, the other party has no chance of winning. Besides, it's no use calling the police. The police are not in charge of everything. This is just a civil contract dispute, which can only be settled through consultation. If negotiation fails, you can go to the court and ask the other party to restore the house to its original state, or give some economic compensation and return the right to use the house. However, there is a main problem, how did the other party get into your room, so you should be careful.