1#重庆人 ( k9 W; x- }4 [' t+ D& t8 q - ^8 y+ b. p+ p: g6 d% _ . e1 A, L3 ]5 k# K( H# O8 \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.