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Howard's reply covers it well. A kitchen extension has probably blocked off the original airbricks, especially if it's a concrete floor butting up against the original footprint's timber floor.
We've just had the same thing, basically no air bricks, as a single front one was blocked, and the rears had been covered by a kitchen extension before our time, and the sub-floor was indeed rotten, and we now wish we'd pushed for a proper floor survey - vendor said no to an invasive survey, which is kind of understandable but perhaps should have raised more alarms.
If possible I'd try and find out more about the state of the floor, either with a full floor/damp survey (although you could argue that damp specialists will always find damp...not always the case but...) or at least a visit to the house with someone experienced in timber floors.
Message me if you want more details.
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si_mon628
tc
Survey has just come back saying there is no sub floor ventilation at the back of the house (where there is a kitchen extension). There are a number at the front but for some reason none at the back. I am a FTB so this is all new to me. How important is this to have at the back? Is it just a case of adding a few airbricks? Does anyone know how expensive/ difficult it might be?
Thank you!