I was doing a bathroom fit a few years ago but turned out to be a job from hell! Everything went wrong that could though it looked a straight forward fit. Bath out, shower in....simples!
I started raggling the wall to put a cold & hot feed in for a new mixer shower. The walls are fully made of plaster. Inbetween both sides of the wall is like a honeycomb plaster. Very brittle too.
I started raggling with a pad saw as it was very easy to cut when all of a sudden, a huge chunk of plaster fell through into the hallway.
I couldn't think how to rectify this until I had a brain wave!
An access hatch for isolation valves. Originally I had put the isolation valves under the sink.
I told the customer that as the bathroom was so small, I couldn't put the isolation valves anywhere else.