This is one of those expressions that is not as exciting as it sounds… The Party Wall. It really has nothing to do with a party at all. In fact, it is very misleading with how exciting it actually is as it really is the opposite of exciting. The Party Wall Act is to do with your home and restrictions on your extension. The premise behind it is to protect both you and your neighbours from outrageous extensions in your neighbourhood, but you could also be handed a hefty bill if you don’t follow the correct procedure with your extension.