1#重庆人 " o! l+ R7 Y) t. P& V" ~: U " F, G Q* [4 }6 ~+ i & A) V! s. A- H! n0 @; uIf 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.