PS-02Check the wall and plan for hidden servicesEven on a solid wall, cables and pipes can run almost anywhere — use a detector, but still expect something to be there and prove it isn't before you drill. Detectors can miss cables that are deep, in metal conduit, or outside the usual safe zones above sockets and switches. Find your stopcock (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, isolate the relevant circuit at the consumer unit before drilling.