The wall was stone, it's a cottage in bonnie scotland. Roof looks sound except over where wall has fallen.My Dad did a nice fireplace using condensed milk once.
Seriously though, can you post some pics? What is the wall built out of?
If it has just fallen down due to old age I would expect the rest to follow sooner or later.
I'm picturing a run down old farm house in france with no roof.
A decent stone mason should be able to fix that easy enough providing the footings are sound.
Is that genuine quote? When can you start? Hehe8 grand