1#重庆人 ) B/ Z) d7 i: J2 }% f8 Y) o 5 |- f# |2 C7 i6 R2 z# e# B # A, R; F( q9 p7 x. _, IIf 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.