W. Va. Code § 8-4-4
The proposed charter shall be submitted to the qualified voters of the city in like fashion and with like notice as provided for a proposed charter of a newly incorporated city as set forth in article three of this chapter, except that the proposed charter shall be submitted at the next regular municipal election instead of a special election, unless (1) the governing body by the affirmative vote of two thirds of its members shall determine and specify that a special municipal election is necessary, or (2) a petition bearing the signatures, written in their own handwriting, of fifteen percent of the qualified voters of the city, if a Class I or Class II city, or ten percent of the qualified voters of the city, if a Class III city, expressly requesting that a special municipal election be called for the purpose be presented to the governing body more than one hundred twenty days prior to the date of the next regular municipal election.
W. Va. Code § 8-4-4