BWP-04Check for cables and pipes, and know how to shut things offCables and pipes can run almost anywhere in a wall, including up to sockets and lights near the window, so sweep each drilling point with a detector first. Even with a clear reading, still treat the wall as if something could be there, since detectors miss deep cables, cables in metal conduit, and anything behind metal-backed board. Before you drill, find your stopcock (usually under the kitchen sink) and check it turns freely, so you can shut off the water fast if you hit a pipe. If you have any doubt at all, isolate the relevant circuit at the consumer unit before drilling.