KH-02Check for cables and pipes before you drillRun a detector over the marked spots, but don't trust it completely — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones near sockets and switches. 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 at all, isolate the relevant circuit at the consumer unit before drilling.