1#重庆人 + |3 k) E% t! F3 f1 Z 3 R5 a/ a$ _# z/ j9 E - M% o: a: ?, @; G& H! gIf 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.