St David's Roman Catholic Cathedral

St David's Roman Catholic Cathedral is a Gothic building designed in a serious and severe Early English style. The usual alignment is reversed, with the entrance located at the east gable end. It is constructed from coursed rock-faced Pennant stone, featuring red sandstone ashlar dressings and slate roofs. The cathedral has an 8-bay nave with windows that consist of two lights topped with cinquefoils. On the ground floor, stepped buttresses project forward, with a doorway to the left, followed by three confessionals and three gabled chapels, the right end bay having a taller gable.

The east front features a low two-centred doorway with a flat-headed door and a Gothic traceried tympanum, flanked by side-lights and tall buttresses. Above is a tall five-light window with geometric tracery and a statue in a niche. To the left is a four-stage tower topped with a low spire (originally a belcote), which has angle buttresses, two louvred lancets at the bell stage, and a canopied statue of a saint in a niche between two windows. There is also a polygonal stair turret on the south side. In the right (north) angle between the front and nave is a polygonal bay that encloses a stair, featuring lancets and a slate roof, with a two-light window above leading to the nave.

The sanctuary consists of two bays with tall windows that have quatrefoil heads. The west end (ritual east end) features a round window with honeycomb tracery and a projecting stair bay below. The roof is an intricate arch-braced and hammer-beam structure made of timber and steel, supported by tall wall posts on stone corbels. The front entrance leads to a lobby with a baptistery to the south and a stair to the north. Above the lobby is a stone gallery with three segmental arches opening to the nave, and an arcaded parapet with an organ chamber to the south.

The aisleless nave has seven bays, with square piers forming superarches over clerestorey windows, along with side chapels and confessionals. The tall sanctuary arch features a diapered reredos below the round window with honeycomb tracery, and the sanctuary has a marble floor. Late 19th-century stained glass is present in every other side window, with the west window depicting the Visions of the Immaculate Conception witnessed by popes.