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Fairly typical stuff then. Is there proof of water igress from the flashing? Lots of surveys will mention it because it looks old with binoculars. Guttering is basically a day rate from a roofer + minimal parts (possibly half a day if there’s not loads). Garden slabs are probably most intensive, especially if he ground is also higher underneath but it’s not a technically difficult job. Worth getting quotes and asking for a contribution but it’s not big money to sort if they tell you to do one.
It's a Victorian terraced house that was extended in the 60s. The roof has old lead flashing and has been letting moisture in, the roof itself is not too bad apparently. The gutters are old too and not doing their job properly and the garden slabs have been put too high up, causing water to flow into wrong places (i.e. the base of the house).