He said this to us, i.e the price is the price and if something comes up unless its a a major unknown then it wont change, so the risk is his I guess.Nah not for hourly or day rate either I have that worked out for myself and if it comes in under the timescale you price for your up slightly and if it comes in over that’s your mistake as a professional. The price is the price.
unless you come across a major snag in the build. Then you have to go back and talk with the customer.
don’t see the need to put a price for every single item I’m buying that’s my business.