TSC-02Check for cables and pipes, and find your stopcockRun a cable and pipe detector over the whole area before you drill anything. Detectors miss cables that are deep, in metal conduit, behind metal-backed plasterboard, or running outside the usual safe zones, so still treat the wall as if something is there until you have proved otherwise. Find your stopcock now, usually under the kitchen sink, and check it turns. If you have any doubt at all, isolate the circuit at the consumer unit before drilling, and turn the water off at the stopcock before cutting into anything that could carry water.