1#重庆人$ f, L) x! z6 G+ `# M% o
( q) ? v* P7 n4 e! f
. u% a& R; B, R8 x T3 a5 T y8 ^
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.