Seion Independent Chapel was built in 1823 and rebuilt 001844 to the design of architect T. Thomas of Llandovery. The chapel was modified/partly rebuilt again in 1890. The present chapel, dated 1890, is built in the Simple Round-Headed style of the long-wall entry type and still retains the original small-paned sash windows. The chapel is Grade 2 listed.

RCAHMW, August 2009