W. Va. Code § 39-1-13
When any tract or parcel of land within the limits of any county of the state has been or shall be hereafter subdivided into lots by any partition of land or by order of the owner or owners, or his or their agent, or otherwise and any lot or lots have been sold or conveyed, or are offered for sale, from the tract or parcel of land so divided, according to a plat or plan of subdivision, without such plat or plan of subdivision having been filed for record, it shall be the duty of the owner or owners of such tract of land, or his or their agent, authorizing such plat or plan of subdivision of such tract of land to be laid out, to file such plat or plan for record in the office of the clerk of the county court and the office of the county assessor of the county wherein such land so divided is situate.
W. Va. Code § 39-1-13