It is not going to happen until it happens. You may think you've got all bases covered but a thief knows ways to get in that you don't. Even low life thick as plank scumbags.I live myself in a 3 bedroom, and as i only need the one the other 2 have become a workshop and whats otherwise known as The Bike Room.
I personally wouldnt leave it in a garage or anywhere like that, shed, custom built bike store etc, all are suseptable to thieves, it's the places that type of scum target first. In the house they've a well secured front door to get through and that just isnt going to happen.