1#重庆人 2 z; o" b3 S. | 8 p4 E" L$ t! Z+ R5 z 9 q. w: p# n& ]) @; I: a0 {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.