Thoughts, whether you do it or they do it, I'd be knocking a couple of holes in the ceiling to have a look at the joist orientation etc.
look at the joist orientation
Specifically what?
They run in line with the wall - ie left<>right in that picture, not front to back.
@hugo7 started
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Thoughts, whether you do it or they do it, I'd be knocking a couple of holes in the ceiling to have a look at the joist orientation etc.