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My shower head is on external wall, – mixer (which needs a bit more space) is at the other end of the bath so it’s just one skinny pipe that runs up to the shower head and fits in the depth of standard dot&dab plasterboard. Did not need any building out of the wall.
Bath uses an overflow filler (on same controls as the shower) so no bath taps cluttering things
The need to build out the wall will depend on what type of shower mixer you want. Careful consideration and parts selection can avoid it, but maybe bring a different set of compromises.
I wanted easy access to the shower mixer without leaning around shower screen, so have this at head of the bath, mixed water then goes to the shower head and/or bath overflow filler.
