Seion Baptist Church was built in 1829 and rebuilt in 1881 in the simple round-headed style of gable entry form. The single story interior has the pulpit against the back wall, flanked by a pair of pulpit windows and with a plaster arch containing the painted inscription 'Heddwch fyddo o fewn dy ragfyr'. In 2015 the chapel was still in use.

RCAHMW, October 2015