Ok time for me to chime in again.
A discount a builder gets is just that a discount a builder/contractor gets. In no way does it need to be passed onto the homeowner. If the builders wants to pass the savings onto the owner that is his choice. In no way is that discount for a homeowner and in no way should a homeowner think they should get that discount.
If you have issues with what the builder is charging for items, the time to bring that up is before the work on those items is started. If you agree to have him do the work at prices he gives you in advance at no point should you ask for a refund or discount once the work is completed. It comes down to the fact if you are happy with his work and you agree to pay what he charges you should both be happy. I would not wait until the end and say "wait a minute that price is high" sorry its just wrong to do so. Anyone in the business would agree. Enjoy the build
BML
At the time of your chiming in again, no one had said anything about asking the builder to return part of his discount. That was your idea in your above quote.
What I said was: "Another thing to realize is that your contractor, more than likely, gets a percentage discount or credit to future purchases from the suppliers that he regularly uses for material compared to the retail pricing that you are paying or using in your calculations. So when using a percentage, the higher the price of a material the more discount in real dollars."
All that is saying is that if the home buyer ask for an upgrade on a $40 water closet that the builder saves $4 on to a $300 water closet that the builder saves $30 on which the labor cost to install is the same, then the builder is making $26 dollars more than he originally agreed to on the deal. Everyone knows it is a make some lose some proposition on both the material and labor when building a house and in the end it might all even out or someone could come out way ahead. The prime contractor might not make anything in the end after paying the subs. But with the size of this company and other ventures they are in too, you can figure they are doing all right, on the average.
You are right about the extra charges being agreed upon before the work is done. In many jurisdictions a grunt, nodding of a head, a handshake,
or the failure to object to an added price in writing before the additional work is started signifies a legal contract. It is just could be hard to prove and become very expensive for both parties to a third party if it is not in writing and signed and dated.
Now is not really the time to start fussing about prices on things already agreed too. With only 3 weeks to go, the quality of the remaining work to be done may suffer in any case. I said at the beginning of this project that speed is often not a friend to quality craftsmanship.
I think in the end both parties will come to a reasonable agreement. It certainly would not be to anyone's benefit to get ripped off with as much publicity as this project and contractor is getting on the www.
Ron