WR-03Check for cables and pipes, then find your stopcockRun a cable and pipe detector over every mark before you drill anything. Detectors miss cables that are deep, in metal conduit, or outside the usual safe zones near sockets and switches, so still treat the wall as if something is there. Find your stopcock now, usually under the kitchen sink, and check it turns freely so you can shut the water off fast if you hit a pipe. If you have any doubt at all, isolate the relevant circuit at the consumer unit before you drill.