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Ok we had exactly the same thing when we bought our house. The flooring level was wonky on the main house ground level so we were concerned that the joists were rotten. There was some evidence of damp so we assumed the worst but the owner said no to opening up the flooring and checking the joists. We knew that we were renovating soon after we moved in so just budgeted for it.
Turns out that the kitchen area (which seemed fine) was built up with no ventilation at all so the timber frame it was constructed on was totally rotten and could have collapsed at any time.
The previous builders who had renovated the house 15 years ago basically just cut corners and did it on the cheap.
It's hard to know how bad it is until you pull up the floor but clearly ventilation is very important. The rotted flooring smell apparently was awful when they opened it all up, but as I said it seemed fine from the surface.
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Bainbridge
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!