1#重庆人 ' U1 ^% |9 D# e; ~ 1 q( Y* W/ G8 P& o' r1 v) b0 G & x2 @; g3 e8 f# pIf 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.