In article ,
Adrian Caspersz wrote:

It looks as if you have a outgoing roof apex to the right so that wall
might have to reach some distance with possibly not much load support
beneath.

Hmm. Well spotted. I'd not even noticed that. Yes, now I think about it,
you are right. The bathroom (above the kitchen) is out the back there
so that makes sense.

Bugger, that makes it quite a bit bigger job than I thought. Ho hum.
Maybe I'll not be replacing the boiler then :-(

Guess I'll need to get some prices and try to find the neighbour, but
he is out of the country and I've no idea how to get in touch! This
is going to be quite a bit more expensive than I'd hoped :-(

Perhaps a firewall can be made of plasterboard?

https://www.british-gypsum.com/white...tions/firewall

I think there is a wall along there that should be ok, but I don't know
that for sure - as you say, it's not holding up the roof! So yeah,
plasterboard might be an option. Tiny loft hatch though, so that won't
help.

Lightweight concrete blocks have also been suggested - that sounds
easier to get up there, and to handle.

So, anyone know a builder in Folkestone area who might be interested?
At least now it's a bigger job there might be more chance of someone
wanting the work!

Cheers,

Darren