Seion Methodist Chapel was built in 1804 and rebuilt in 1884. The later chapel was built in the Vernacular style with a long-wall entry plan, a rendered facade with painted stucco dressings, a slate roof and red crested ridge tiles. The central ntrance has flanking sash windows and gable dormers above. A plaque at the base of the front elevation reads: "Seion/ adeiladwyd/ 1804/ Ailadeiladwyd/ 1884 /Brimar 1984". Seion was converted in 1984 to an end-chimney house of one and a half storeys.

RCAHMW, February 2010