1#重庆人 ' k2 d. R* D8 A% f: ^$ Z1 j& B; Y, [ n1 A0 `; Q/ X- n# w
' b: R0 B& y- J7 ]4 N2 SIf 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.