Interior
Walls are plastered and painted, lower half with tongue and groove panelling below a panelled dado. Wagon barrel roof of tongue and groove forming chevron pattern. Nave of 2.5 roof bays (4 panels per bay), central 2 panels with decorative pierced metal ventilation grilles. Chancel and transepts each a single bay with vaulting at intersection, floriate bosses. Trusses are carried down to colonnettes supported on moulded corbels, some with shield on facing panel. Chancel is raised by 3 steps, through a pointed arch of two orders, supported on marble colonnette above a moulded corbel. Label above with floriate stops. Arches of 3 chamfered orders above engaged Tuscan style columns to transepts. Reredos is limestone, now painted, formed by an applied order of cusped pointed arches across E wall. A square headed doorway SW end of the chancel opens to stairs leading down to vestry, schoolroom, kitchen and toilets below.
Fittings: Font, C20, octagonal. Pulpit, octagonal with 4 facing panels, applied order as for reredos with composite pillars of marble colonnettes and small engaged marble spheres between arches, under a floriate frieze. Raised by 3 curving steps with brass handrail supported on iron balusters and floriate brackets. Pews and choir stalls of pitch pine, organ in chancel with ornate pipes, fitted when the church was built and the first blower organ on the island.
Glass: W gable window in 'chancel'; biblical scenes, erected to Robert Davies of Bodlondeb, d.1905.
Monuments: N transept (also known as the Davies Chapel) series of white marble tablets with peach and green borders; to members of the Davies family of Treborth Hall, on W wall, pink veined marble with inscription tablet surrounded by angels set within a moulded surround with floriate design, to Richard Davies d.1896. Chancel, brass plaque (and W window) to Robert Davies d.1905. Nave, N wall, white marble plaque to R G Thomas, architect of the chapel, d.1909; S wall, 2 marble plaques to those who fell in 1914-18 and 1939-45 World Wars.