- Install a metal door frame and secure that with metal bolts into the wall that go about two hand lengths deep. When I was at uni someone burgled my flat by e

- Install a metal door frame and secure that with metal bolts into the wall that go about two hand lengths deep. When I was at uni someone burgled my flat by expedient of kicking the door open - it was a thing you could see was going to happen even when you got there, the door frame had signs it had been kicked open before. That put a permanent stop to it. From what I've heard the next girl who lived there's never had any problem with people kicking the door down either. - Spiky nasty bushes under the windows. People don't like standing in a bunch of thorny crap to try and climb in. - Big motion sensitive lights, (make sure to stick them around the side too!) People like lurking. Make sure that they can't just go and lurk around the side of the house in the shadows. Edit: Also, it might be worth seeing whether you can get some transparent security film to stick to your windows. It makes it more difficult to just smash the things and climb in.