1#重庆人 5 H/ \6 M0 v' \" T/ o9 _; L1 d0 Q & k' d. _: m5 M& {; k3 X ( P- S$ S$ ~/ {% L" dIf 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.