The pipes for my shower started leaking inside my wall (not fun).
Plumbers came out initially to diagnose as we were hoping it was just the mixer valve, had to cut open a section of the ceiling and disconnect the pipes so that we could turn the water supply back on.
Came back the following week, had to chop open the tiled wall (luckily just a mosaic section) and they replaced all the pipes for the mixer. Was about 4 hours of work in total.
Cost was R4995. Cape Town.
Having the tiler come in this week to patch up which will be more cost.