Owning your own home

Yeah so the boundary is somewhere between the garages in the rubble. At least I think that’s were it is.
I’ve wondered exactly where the boundary and if the neighbours garage infringes on it.
The path that used to be there let the other folk take their bins through to the front rather than taking them through the house.
Now that the path has been built over, as far as I understand, the other house that would have used the path now take the bins out via said garage!

My neighbours are pleasant and we chat pretty much every other day. I don’t want to put them out in anyway and obviously won’t chap the door one day telling them their garage needs to be demolished!
If I can simply rebuild my garage in the same spot without having to worry about it’s proximity to the other garage then I guess there’s nothing to worry about.
But if I’m not able to do that… it’s going to be quite brutal explaining things to my neighbours.