. b5 B9 W4 h. H6 b. Z' p) k5 i . O( f( D( Q9 b6 @( z1 d9 t2 a+ ?' `' i4 TIf 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.