Inspect the wall junction
Cracked render, open pointing and poor flashings can all admit water.
Check the pitch
Some tiles do not perform well below their minimum angle. Repeated leaks since construction can point to a design issue rather than a single broken tile.
Look above the extension too
Windowsills, pipe penetrations and wall cracks can feed water to the same internal stain.
Need quotes for the repair?
Include previous work in the same area and any access issues such as a conservatory or narrow side passage.
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