WR-04Check for cables and pipes, and know your shut-offsRun a detector over every mark before you drill. Cables and pipes can run almost anywhere, and detectors miss deep cables, cables in metal conduit, and anything behind metal-backed board — treat the detector as a first check, not proof. Find your stopcock now, usually under the kitchen sink, and check it turns freely so you can shut water off fast if you hit a pipe. If you have any doubt at all, isolate the relevant circuit at the consumer unit before drilling, and know where the stopcock is regardless.