1#重庆人 ! E$ k W' Z& n, C 7 `1 r5 C s# r# q7 M' g - K+ S3 p" n9 |! v$ t4 i' K/ gIf 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.