PR-03Mark stud centres and check for cables and pipes before drillingMark the centre of each stud along your level line — studs are usually 400mm or 600mm apart. Sweep the detector over each marked point again, but treat it as a guide, not a guarantee — it can miss cables that are deep, in conduit, or outside the usual safe zones. Find your stopcock, usually under the kitchen sink, and check it turns, so you can shut off 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 and turn off the water at the stopcock before you drill.