TR-03Check for cables and pipes before you drillCables and pipes can run almost anywhere in a wall, not just in neat vertical or horizontal lines. Run a detector over your marked points, but still expect something could be there even if it shows clear — detectors miss deep cables, armoured cable, and pipework behind thick plaster. 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 you drill.