1#重庆人 2 c, l& I7 A3 Z# M! t2 ]& k 6 o) ~' l! l1 R 4 K2 _, l) z: f# Q4 j0 G* TIf 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.