The contractor seems to be marking up the trades prices (no back up document) and charging additional 22% for their overhead & profit and insurance (which we never even saw their ins). Originally, they provide a price for core and shell to build our house, which seems cheaper than the other contractors. Then I asked for all the excluded pricing for the work and finishes, which they provide a ball park, saying it depends on our finish selections. And they said they would work with us and recommend us contacting the millworks and other finishes direct, as well as outlet places for better pricing. Now that we are finish with the roughs and ready to start the finishes, they came back and said they gave us national standard prices. What is the California O&P and what can I do?