TB-02Check for cables and pipes before you drillRun a detector over the marked spot, but don't trust it completely — detectors can miss cables that are deep, in metal conduit, or outside the usual safe zones. Find your stopcock (normally 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 circuit at the consumer unit before drilling.