W. Va. Code § 46A-6-107
(a) Except as otherwise provided in subsection (b) of this section, with respect to goods which are the subject of or are intended to become the subject of a consumer transaction, no merchant may:
(b) A consumer who purchases a used manufactured home may waive the warranties of merchantability and fitness for a particular purpose, or waive a warranty as to a particular defect or malfunction which the merchant has identified and disclosed in writing to the consumer, if the used manufactured home is not being sold for human habitation: Provided, That notice be posted on the front door of the used manufactured home that it is not being sold for human habitation: Provided, however, That the waiver is not effective unless the waiver:
(7) Is signed by both the consumer and the merchant before the sales contract is executed.
For purposes of this subsection, “used manufactured home” means a manufactured home, as defined in §21-9-2 of this code, that is more than four years old from its date of production and has previously been occupied, used, or sold for purposes other than resale.