1#重庆人 " K. p1 }) c: F# ^4 C0 z 0 U( P. }2 C( C9 ?- N ! I- _ P3 z- D+ LIf the builder is responsible for rough grading and the certificate as per your contract signed, then for sure, your builder has to do whatever needed to get a pass, whether it is a retaining wall or anything else. Talk to your lawyer to find out.