SPK-02Check for hidden cables and pipes, and know your isolation pointsCables and pipes can run almost anywhere in a wall, not just in the usual safe zones. Run a cable and pipe detector over every marked point before drilling, but still treat the wall as if something is there — deep cables, metal conduit and anything outside the safe zones are easy to miss. Find your stopcock now, usually under the kitchen sink, and check it turns, 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 you drill.