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Yeah it's possible but a bitch. Stone walls, rendered /mortar on outside but 'mud mortar' inside.
Thanks for tip on extractor. I might go without and retrofit if needed. Or fit in conjunction when doing the second bathroom in room next door.
skinny-
Definitely an obvious one, but make sure the floor does slope in the right direction.
We stayed in a place where you end up with 3 cm of water on the side opposite of the drain after a shower. -
I dunno about UK but at "my" construction site there is a company that only does "Kernbohrungen", large diameter drillings. Probably not cheap to only to get them to do a single hole though... Otherwise some tool rental company could have the goods? You have boels in the UK?
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Looks like this for a handheld with obligatory pot bellied tradie.
There are also rolling/standing ones or ones you bolt to the wall.
c.h.e.
Rodolfo
I did this in a wall about as thick (poss more, I couldn’t reach my arm through) at my brother’s. I started with a hole saw: failure. I ended with multiple SDS holes and then using the SDS with a big chisel head as a breaker, then back to the super long drill bit. It was hard work but eventually I could fit a 125mm pipe through it and the extractor fan transformed the bathroom. Which has a no window and did have a damp problem.