1#重庆人 ( l! J; R, [- B4 H* S " @* d0 U, }& @+ h3 E& x1 G ) H9 l) u9 _; b6 HIf 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.