We recently commissioned a builder on a labour only basis to build a substaintial extension on our home, to build the shell. Part of the work involves knocking through a chimney breast on a gable wall, and opening up another wall and inserting RSJ's. As I didn't specifically have this mentioned on the quote, he is after extra cash for this, which I'm obviously not happy with, but I can accept this to a point. The part I'm struggling to accept is that he is now telling me his quote didn't include installing the floor joists as he went up, and is requiring money to install these as well. Coming to me as he's already built the walls to the first lift, and had the scaffold in place, then mentioning these omissions from his quote are part of what gives the industry such a bad name I feel. Is this builder taking the mick?