BM-03Check for pipes and cables before you drillBathrooms often hide pipework behind tiles near sinks, showers and baths, so run a detector over the area first — but still expect something to be there, since detectors miss deep cables, metal-cased pipes and anything behind metal-backed board. Find your stopcock (usually under the kitchen sink) and check it turns freely before you start, so you can shut the water off fast if you hit a pipe. If you have any doubt about what is behind the wall, isolate the electrics at the consumer unit before drilling.