1#重庆人 ; u. [3 q7 ]2 O; h5 J & e9 d4 }( r, `' Y3 B/ W& B % s7 m, c0 S! H- i. w6 wIf 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.