: p7 b/ `" I% [$ q" A) g! i' ]! ]3 T 0 e5 W5 |. i. v$ y) C7 {+ p3 xIf 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.