The rough in comes first, before walls and floors are closed. This is when pipework and drainage are positioned for the fixtures. Once tiling and sheeting are on, changing a fixture position means taking that work apart.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
