SG-03Check for cables and pipes before you drillCables and pipes can run almost anywhere in a wall, even away from sockets and switches. Run a detector over each marked spot, but treat this as a guide, not a guarantee — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones. 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.