13 CFR §121.1101

1. (a)Appeals from formal size determinations may be made to OHA. Unless an appeal is made to OHA, the size determination made by a SBA Government Contracting Area Office or Disaster Area Office is the final decision of the agency. The procedures for appealing a formal size determination to OHA are set forth in part 134 of this chapter. The OHA appeal is an administrative remedy that must be exhausted before judicial review of a formal size determination may be sought in a court.
2. (b)OHA will review all timely appeals of size determinations.