1#重庆人 8 p: }5 p* h- G0 x7 _ 3 x% {; v* b; H K2 M , ]$ V, O0 w# g9 nIf 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.