 The Grade I listed buildings in Somerset , England , demonstrate the history and diversity of its architecture . The ceremonial county of Somerset consists of a non @-@ metropolitan county , administered by Somerset County Council , which is divided into five districts , and two unitary authorities . The districts of Somerset are West Somerset , South Somerset , Taunton Deane , Mendip and Sedgemoor . The two administratively independent unitary authorities , which were established on 1 April 1996 following the breakup of the county of Avon , are North Somerset and Bath and North East Somerset . These unitary authorities include areas that were once part of Somerset before the creation of Avon in 1974 . 
