St Mary's Church

St Mary's Church is a Gothic Revival style church built from roughly dressed stone arranged in regular courses, featuring a slightly projecting base and a slate roof. The church includes a nave with a clerestory, a lower apsidal chancel, and north and south aisles. There is a porch on the south side topped by a crucifix and a quatrefoil window on the side. Above the chancel arch, a bellcote is surmounted by a metal crucifix. The west end has three single light lancet windows with trefoil heads and a large circular window above. The aisle windows are paired lancets with trefoiled heads, while the clerestory windows are circular with cusps. The apse features high-placed 2-light windows above a band of ashlar.

Inside, the church has a plain interior with five bays. It is particularly notable for the high-quality glass in the apse, where fragments of stained glass from the 14th and 16th centuries have been reassembled in the north and south windows. The north window depicts early 14th century monks under trefoiled gables and pointed canopies, with a further figure in a roundel above. The south window features figures in roundels under canopies that surmount coats-of-arms, along with another figure in a roundel above. Mostyn-Lewis suggests that some of the Treuddyn glass may date to around 1305 and notes its stylistic similarity to the glass at Merton College, Oxford.