We've had a small hole in one of our floorboards for about 3 years now. As far as I can tell it was where they were taken up at some point for the central heating pipes. Didn't realise the entire floor was a hazard because of itSo a small hole in the floor (admittedly that’s not acceptable) now the entire floor of the house is a potential hazard making the whole house unusable. Or perhaps it’s just a small hole in the floor?