Omer, the house is still there. We backup the server everytime we restart it. We have restarted it a lot recently because people keep setting fire to the world/stealing people's things/griefing. If we all behaved a lot more maturely, then we wouldn't have this problem.
So in future, I want to lay down some ground rules:
Those lifted above will not be tolerated. If you are guilty, you will be removed from the server.
If you want to use an item, ask before just taking it
If you know something belongs to someone else - i.e a chest - DO NOT steal it