How much can I expect to pay for general contractors?

[Josiah Halverson]

How much can I expect to pay for general contractors?

Let's say that prior to making an offer to buy a rehab, I hire contractor A to do an initial walk-through with me and come up with a detailed improvement plan (cost and time schedule).

Next, I send out bid requests to both contractor A and other contractors for that job. Contractor B wins the bid and his responsibilities will be pretty much everything because I have a different full-time job. My understanding is that I should expect to pay contractor A roughly $250 for the walk-through, but how much do I pay the bid winner, contractor B? Is it a certain percentage of the total improvement cost or something else?

Thank you for your input!