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Does that mean a roof terrace needs planning permission that this one doesn't have?
In which case that's a strange thing to wave around so prominently in a sales listing given that it's a potential issue during the purchase.
There's something weird about the internal pictures as well, though maybe it's just the lighting and the shutters - they nearly all make it look like the house is underground.
Unofficial roof terrace doesn't sound at all concerning
https://www.rightmove.co.uk/properties/76344345#/