CH-04Check for cables and pipes before you drillCables and pipes can run almost anywhere, not just in the 'safe zones' — a detector helps, but it can miss deep cables, armoured cable, or anything behind metal-backed plasterboard, and a metal stud frame can confuse a cheap detector further. Scan the area properly, then still drill cautiously and be ready to stop the moment you feel resistance or see anything unexpected. Before you start, 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 about what's behind the wall, isolate the relevant circuit at the consumer unit first.