1#重庆人 / B) ~: d; R" t. _ 4 n: h+ p) c+ u ! f7 V2 I) t& O) m$ ^If 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.