The added cost is $250/window. They looked at the existing windows 3 times. There is nothing unusual about the construction of the house. It's standard 2x4 studs, so what do they mean by different frame depth? I think they should have known about this extra cost before. Replacement of the casing is something we had talked about before and we had told them to use the old trim as we were going to replace all the wood trim in the house anyway (so we certainly don't want it painted but that's another issue).We have identified that the existing windows you have installed currently are a different frame depth than the new Milgard Ultra windows we will be ordering. This means more work will need to be done to make sure the windows are installed correctly with a quality finish. We will need to replace the jamb and casing around the 13 openings. We will also need to paint the interior trim after the new windows are installed. This requires more in labor and material costs that were not accounted for when you signed the contract.
My question is are they jerking us around or are they just incompetent? i.e., assuming they couldn't figure out what the job was after having been to my house so many times, is this a reasonable request?