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chrisbmx116
The bathroom wall is a shared party wall isn't it? That's what the dash-dot lines on the drawings are suggesting and if it's in line with shared wall between the houses that you can see in the roof it probably is. So they can use it to support their extension roof just as you're using it to support your bathroom roof.
Personally I'd get a surveyor even if it's theirs. In case anything happens eg cracking or movement on your side, which is not totally unlikely even with a good builder. You don't have to be a dick about it or ruin your neighbourly relationship. They should understand that it gives you both reassurance. But IANAPWS.