PDFWAC 296-150I-0100
Manufactured home installation—Manufactured home installer certification required.
Manufactured home installation work which falls within the scope set forth in RCW 43.22A.010(6) shall not be performed on a manufactured home without the on-site supervision of a certified manufactured home installer. Some categories of installation work are exempt from certification requirements in accordance with RCW 43.22A.120, WAC 296-150I-0105 and 296-150I-0110.