1#重庆人 ; ^2 }- _ J9 {! F. U" g- g K# K0 K5 R: p+ s" o . ~7 B/ g3 c9 b( m0 X/ b7 F1 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.