AB-03Check for cables and pipes before you drillRun a cable and pipe detector over the marked area, but do not trust it completely — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones, so still treat the wall as if something could be there. This matters more on exterior walls, since outside lights, sockets and outdoor tap pipes often run up from below. 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 drilling, and turn the water off at the stopcock before you start.