When I said, "it's not even my house", what I meant to say was, "I don't want to listen to it, much less subject my headphones -- expensive or otherwise -- plus a house that's not even mine -- to the (admittedly unknown) dangers".
I'm not worried about fires, I'm worried about the unknown. If I had more confidence in him as an engineer, then I wouldn't; but I don't, so I do.