The plumber our GC hired for our kitchen remodel was asked for an estimate to re-route 2 radiator pipes that were exposed when we removed a wall. He did not give us an estimate, but subbed the job out and gave us an invoice as soon as the pipes were moved but several days before the heat went on. The invoice just had the total (double what we had guessed) and when we asked for a breakdown of materials and labor, the he increased the price. We confirmed with our GC the amount of time the sub spent on the job (1 day, we were billed for 3.5 days) and priced out the materials with a plumbing supply (not terribly different from his charges) . We are considering sending payment using the labor our GC said, plus materials, plus a 10% markup since this was subbed out. Trouble is, the rest of the plumbing for the kitchen and half-bath is only halfway done and we signed a contract with the plumber on that part of the job. We have spoken to our GC about the lack of an estimate and the discrepancy in labor costs, and the GC says he is fine firing the plumber for the rest of the job. But all this is causing my husband and I a fair amount of stress. We would love to get some opinions on the fairest and safest way to handle a situation like this would be. Thank you!