If you don&;t know much about it, or you will be squeezed later, you have to know about the decoration before the decoration. I know that the gossip section of Tianjin Cool Network introduces the preparations before the decoration, and you can&;t rely entirely on the company&;s statement. The brother upstairs is right. It is best to read professional books or go to relevant websites. You can go and have a look. Yes, and renovation contract should also write clearly what is added.