We are in the middle of our custom house now. In the old version of elevation design, we found a weird "spike" on the roof, so we ask the builder to change patio height to reduce this problem.

But this week when we visit the house which is under frame constructing, we found the spike just right over there. After contact our builder, he admit it's his fault to give the contractor wrong elevation plane. He told us he may not fix the problem because it will influence the structure.

And today, before we discuss the "compensation", he requested payment for the frame work. We response him we will not pay anything before we have agreement on this problem. So he email us and want to know "what compensation are you request?"

Can anyone suggest how to deal with this issue? What is proper compensate we should request for? How to negotiate with the builder? Thanks for your help.