So since moving to our new house, my girls have gotten so much more violent. They have started…

So since moving to our new house, my girls have gotten so much more violent. They have started biting, a lot. They now headbutt everybody and everything, and smack people. Ive tried to tell them its not nice, do not do it, put them in time out but I'm not getting anywhere with it. How can I stop this behavior? Because they are driving me crazy having to watch their every single move because they will headbutt each other or bite each other in a second over nothing at all.