Thanks for that explanation. Negotiating down the price after it started (and after he added necessary charges for some extra work) is not something I even thought of, and of course he called us each time he found some problems with the foundation that needed extra work and money (and he specified how much) and we gave him the go-ahead each time. But I guess thats what he meant and I did not understand as I would never have dreamt of trying to not pay him for what we agreed on. I would not be able to sleep at night if I did anything like that. In any case, I gave him an extra $50. And half of the payment for the next job he will do for us