Kills are not allowed in Inside any private residence, including garages, unless you are invited in by someone that lives at that residence. To clarify: you are safe inside, you are not safe outside. Fenced backyards are not safe. Keep in mind you can shoot into these areas from the outside. You can't break into their house, hide for hours, and then tag a player when they come home, UNLESS you are invited in by someone who lives there.
To be clear, you must have been clearly invited into the house by someone that lives there. If they haven't made it apparent that they invited you into their house, then you're not allowed to go inside to make a kill. Them opening the door to you is not enough. If they haven't already done so, they have to make it clear that you're allowed to come in by inviting you to come over/in.
