I think in the discussion of moss, 'all around the house' without doubt means outside. Truth is, the phrase can mean in or out ~ around the outside walls, around the inside walls.
I suspect if one had moss growing inside, though, it would have to be within the walls of a roof-less and floor-less house. Or one with soil for the floor, a great interior irrigation system and a clear glass roof. Otherwise, no moss.
I also suspect you are teasing us, Arif. You know English about as well as I do.
