Jumping in here. In Midlothian I have one bid and two others coming. My problem is I really dont have a defined scope of work. I was really hoping for a builder that could "sell it". So far nothing.
If it turned out 2' larger would you expect to pay 30% of the total, of course not. Why not sit in the area and decide if that 2' is that important. If it is then tear it out and re-do it. If its not than be reasonable. My wag its worth about 3k.