CT-04Check for cables and pipes, and know how to shut things offCables and pipes can run almost anywhere in a wall, not just in the obvious zones. Use a cable and pipe detector on every mark before you drill, but still treat the wall as if something could be there — cheap detectors miss cables that are deep, in metal conduit, or outside the usual safe zones. 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 near sockets, switches or lighting, isolate that circuit at the consumer unit before you drill.