The original chapel was constructed in 1841–1842 by T. Evans of Bangor and rebuilt in 1872–1875 by Richard Davies.

[2] The chapel was constructed for the Calvinist Methodist community, a distinct Welsh branch of Methodism.

[2] The chapel remains an active place of worship for the Presbyterian Church of Wales.

[3] The interior forms a "horseshoe amphitheatre"[1] capable of seating 980 people.

[2] The square plan of the exterior is concealed internally by a curved wall[2] and the amphitheatre has a domed ceiling.