Catholic Church of St Dyfrig

The Catholic Church of St Dyfrig exhibits a basilican design incorporating Romanesque and Italo-Byzantine elements. Constructed in the 18th century as a steel frame structure, it is brick clad with stone dressings and features a slate roof behind coped gables.

The western front is dominated by a five-bay gabled narthex, wider than the nave, distinguished by pilaster strips. The central bay displays a small round-headed window above a foundation tablet, flanked by Romanesque doorways. These doorways have nook shafts, roll-moulded arches, and an outer order of billets, alongside narrow round-headed windows in the outer bays. A polygonal turret with a moulded cornice rises above the central bay, surmounted by a copper dome. At the dome's apex, set against the west wall of the nave, is a stone crucifixion sculpture. Oculi are present in the gable ends of the narthex.

The six-bay nave is characterised by shallow aisles featuring pilaster strips and round-headed windows. The clerestory bays incorporate three stepped round-headed windows, each framed with stone surrounds and set within a round brick relieving arch. On the south side, the three eastern bays house a chapel and a confessional, both set slightly back and covered by catslide roofs with narrow small-pane windows. The lower and narrower chancel culminates in a polygonal apse, with high round-headed windows in each facet. A vestry abuts the chancel on the southern side; this brick structure has projecting boarded eaves and windows with stone lintels and sills. The east wall of the vestry features five windows, while the south wall has three, with an entrance on the east side, paired with a boarded door, overlight, and a window to the left.

The west doors lead to separate vestibules containing niches for stoups. A north vestibule includes a staircase for access to the organ and gallery, featuring plain balusters and newels. The nave’s interior is defined by a plaster tunnel vault with broad ribs that descend to ground level as wall shafts. Brick piers support plastered round arches, and a tall chancel arch is aligned with the clerestory sill bands. The chancel floor is stepped marble, bordered by continuous panelling around the apse. A later screen in the nave's end bay delineates an extension to the vestibule, situated below the panelled gallery front. The original chapel has replaced glazed doors; the confessional doors are ribbed. Notable fittings include a forward altar with a white stone mensa set on red brick uprights with grey banding, a brass-domed tabernacle on a reconstituted marble plinth with a mosaic symbol of the Eucharist, an original oak pulpit decorated with foliage and crosses, an Italo-Byzantine sanctuary crucifix by Crabbe—incorporating marquetry detail and a wooden relief corpus made from repurposed pews—Stations of the Cross by Crabbe, an image of Our Lady of the Valleys (at the east end of the north aisle), a Baptism of Christ image (at the east end of the south aisle), modern replacement pews, and a modern hardwood font.