(1) The owner of a mobile or manufactured home may install or perform on-site work or equipment installation work on his or her own home without obtaining certification from the department as a certified manufactured home installer if the home is intended for use as the homeowner's primary residence.

(2) The installation, on-site work or equipment installation work must be performed in compliance with this chapter, Washington installation code.

(3) If the owner of a manufactured home hires any individual or business to assist the owner in the installation, on-site work, or equipment installation work, a certified installer is required to be on-site supervising such work and must meet all the requirements of this chapter.

(4) For the purposes of this chapter, an "owner" of a manufactured home does not include a manufactured home dealer, distributor, park owner or manager, contractor, or developer who installs or performs on-site work or equipment installation work on a manufactured home intended for resale or rental.