1#重庆人 j: i) ~0 y" g # \0 j% W+ ` |4 ^: u9 c6 g : h1 C: ?1 O5 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.