We had a sub contractor (excavator) do faulty work; he ultimately quit and was aware at the time that we would be back charging him to correct his mistakes. Since then, he has provided us with a large list of “change order” items that we weren’t aware existed until ~20 days after he quit. We are disputing these charges and still planning deducting the back charges from his final payment. We anticipate he will try to put a lien on us for the charges. From our point of view, it is obvious that he is building up his fees to offset our back charges. My question is: is he able to bill is for “extras” that we weren’t aware were considered extras at the time? Had he not quit I don’t believe we would have ever seen a change order list.