W. Va. Code R. § 150-1-18
The Commission may require the filing of briefs or the presentation of oral argument or both by the parties. Requests for the filing of briefs or oral arguments shall be made before or at the conclusion of the taking of evidence. The requirements of this rule may be altered by agreement of the parties with the consent of the Commission. Proceedings before an ALJ will include the right of a party to file findings of fact, conclusions of law and briefs.
Oral argument may be presented in lieu of or in addition to the filing of briefs. When, in the opinion of the Commission, time permits and the nature of the proceedings, the complexity or importance of the issues of fact or law involved, and the public interest warrants, the Commission may, either on its own motion or at the request of a party allow and fix a time for the presentation of oral argument, imposing such limits of time on the argument as deemed appropriate in the proceeding. Such argument shall be transcribed and bound with the transcript of testimony.
Unless otherwise ordered by the Commission, briefs are to be filed simultaneously. Initial briefs shall be served twenty-five (25) days after the transcript is mailed. Reply briefs shall be served fifteen (15) days after the initial briefs are mailed. Responsive briefs shall be served ten (10) days after the reply briefs are mailed.
W. Va. Code R. § 150-1-18