RH-03Check for cables and pipes, and find your stopcockCables and pipes can run almost anywhere in a wall, including behind tiles near a bath or basin. Use a detector, but still treat the wall as if something is there until you've drilled a shallow test hole and checked. Find your stopcock, usually under the kitchen sink, and make sure it turns before you start. If you have any doubt at all, isolate the circuit at the consumer unit and turn off the water at the stopcock before drilling near any pipework.