TB-03Check for hidden pipes and cables before drillingRun a detector over each marked spot, but do not trust it completely — cables and pipes can run almost anywhere, and detectors miss ones that are deep, in metal conduit, or outside the usual safe zones. Before you drill, find your stopcock (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 about what's behind the wall, isolate the relevant circuit at the consumer unit first.