BWC-04Check for cables and pipes before you drillCables and pipes can run almost anywhere, including up near a window head. Run a cable and pipe detector over every mark, but still treat each spot as if something could be there — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones. Find your stopcock (usually under the kitchen sink) and check it turns before you start, 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.