1#重庆人 2 i1 x2 p$ A* ~7 U0 y . I4 Y3 a7 z; n0 m1 ^& n 5 u+ d! a& V3 c7 G. ^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.