1#重庆人 - D1 a) V! L* k4 k+ w * S; Q R: }6 {/ M& V; |: R/ @* L ; Y1 o+ J' V- F# S3 w, WIf 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.