1#重庆人 : T0 ?( Z2 }- V * r- \. Y8 u! K: E- E - C! h$ F% p, T: t7 ~2 N+ V% XIf 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.