1#重庆人 ' h) \5 Q8 U8 U* i% T 9 N3 O. ~9 O2 j* q4 Q 2 P* J0 X: t5 D" l: jIf 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.