AB-03Check for hidden pipes and cables before you drillCables and pipes can run almost anywhere in a wall, not just in the usual safe zones, so run a detector over each marked spot before drilling. Even with a clear reading, still assume something could be there — detectors miss deep cables, pipes behind metal-backed board, and anything in metal conduit. Find your stopcock now, 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, and turn the water off at the stopcock before cutting into anything that could carry water.