A builder told me today that he wanted to knock a few bucks off his bill because he's not going to have us wire up the appliances (i.e. dishwasher, range, cooktop, etc.) from now on.

I told him that I would love to "knock a few bucks off" except that he doesn't pay me to wire up appliances in the first place. If the dishwasher happens to get delivered and I am working the finish that day I might slide it in under the counter and connect the wire but I don't charge him for it. He pays for me to supply wiring to the point of junction not to install the appliance. Am I wrong here? Shouldn't the people who are delivering the appliances and charging him an install fee be making those final connections?

Is there a standard?