Clarendon Hall, a co-educational day school offering academic instruction in preschool through grade twelve, is an educational institution fully accredited by the COGNIA. As an accredited institution, of the COGNIA network we are one of over 32,000 schools and systems in more than 70 countries that are committed to continuous quality improvement through accreditation.

In addition, Clarendon Hall School is a member of the South Carolina Independent School Association (also known as SCISA). As a member of SCISA, Clarendon Hall adheres to its standards for academic and athletic programs. Membership makes it possible for Clarendon Hall students to participate in activties with the other 120 SCISA schools. These activities not only include athletics but include academic events such as Quiz Bowl, Spelling Bee, Math Competition, Musical Festival (held at USC), and possibly the largest Chess Meet in South Carolina.