Becsuse OP has said
( if you recall her posts ) that the property was originally used for multiple occupancy
with multiple toilets and all the other stuff that clearly goes with it
Shes turning it back into a family home
There is demolition involved… How much…she hasn’t said
Whats access like as that adds to the cost….she hasn’t said
Whats the existing condition structurally….she hasn’t said
What's the ground makeup …again This determines cost and method of construction….she hasn’t said
What is the construction…she hasn’t said
Is she going eco house …another plus expense…she hasn’t said
How much new build is there in terms of m2 ….she hasn’t said
Is she converting/ raising etc the roof of the existing…she hasn’t said
Hence
Yes of course I’d need to see the drawings
Of note
You know why she hasn’t said…because it’s irrelevant yI this thread !
You also can’t say it’s a lot as you have absolutely no idea of any of the above unless you’ve seen the drawings.
Have you?
Are you the neighbour?