CP-03Check for pipes and cables before you drillCables and pipes can run almost anywhere in a wall, not just in the 'safe zones' near sockets and switches. Run your detector over the whole area, but still treat it as a guess — detectors miss cables that are deep, in metal conduit, or behind metal-backed plasterboard, and a metal stud frame can confuse a cheap detector further. Before you drill, find your stopcock (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.