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Probably only a real concern if there is evidence that the sub floor - presumably timber - is starting to rot due to the lack of circulation. And then your real problem is replacing the floor. Any super squeaky floorboards downstairs?
Adding airbricks won’t be a biggy if access is straight forward. Whether it will solve the problem if there is a problem is another question.
If the extension has been there some time and there is no evidence of sub floor damage then I’d put low on the list of concerns.
Howard
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!