SS-04Do your safety checks before you drillCables and pipes can run almost anywhere in a bathroom wall, not just in the usual zones — a detector can miss cables that are deep, in metal conduit, or behind metal-backed board, and a metal stud frame can confuse a cheap detector further. Find your stopcock now, usually under the kitchen sink, and check it turns freely so you can shut off the water fast if you hit a pipe. If you have any doubt at all, isolate the relevant circuit at the consumer unit before drilling, and turn off the water at the stopcock before cutting into anything that could carry it.