WR-03Check for hidden pipes and cables before you drillSweep the wall with a cable and pipe detector, but don't trust it completely — detectors can miss cables that run deep, sit in metal conduit, or lie outside the usual safe zones. Find your stopcock (usually under the kitchen sink) and check it turns freely before you start, so you can shut the water off fast if you hit a pipe. If you have any doubt, isolate the circuit at the consumer unit before drilling, and turn off the water at the stopcock before drilling near any wall that could carry pipework.