Interior
Four-bay aisleless nave with scissor-braced roof trusses, alternately arched-braced and supported on foliated stone corbels and tiny columns with shaft-rings. Original grained pine pews with simple decorative pew-ends; central black/red patterned pavement. Perpendicular-style octagonal font of painted stone; of conventional type with moulded plinth, octagonal base and bowl with blind tracery panels to each face. Perpendicular-style octagonal pulpit of grained pine on an octagonal stone base, with tracery panels to the main faces. Wooden stepped access on the N side with columnar balusters. Stepped-up chancel with large chancel arch, having moulded and hollow-chamfered detail with ball flower ornament. Wooden compartmented waggon roof with diagonal bracing and carved foliate bosses at intersection points. Vestry doorway, on the N side of the chancel, deeply-recessed shouldered arch with flanking stiff-leafed capitals. Tympanum with marble dedication plaque recording the erection of the church in 1863 under the patronage of John Jesse (of Llanbedr Hall); this also includes the names of the architects (Poundley and Walker) and the contractor, James Porleys. Adjoining the vestry doorway to the W, on the N side of the chancel, is a wide, moulded arched niche occupied by the organ. This is of oak, in simple French Renaissance style. To the L of the chancel arch is an associated Early English style wrought iron grille to the organ chamber. Original choirstalls with raised and fielded, cusped, multi-panel fronts and carved foliate decoration to the bench-ends, with supporting ringed shafts. Simple oak altar rails to stepped-up sanctuary, supported on partly-gilded, wrought-iron tracery piers. Encaustic tiled pavement by Maw and Co.
Monuments: Nave, S wall (E-W): mural monument to Edward Lloyd of Berth and Rhagatt, d.1859; by John Gibson, RA, signed and dated 1863. Grey marble tablet with arched top and a relief profile in white marble, set within a recessed roundel. Next is a large classical monument to Ursula, wife of Hugh Lloyd of Berth, d.1795, removed from the old church of St Peter and re-set here presumably c1863; by S and T Franceys of Liverpool. The monument consists of a white marble tablet with moulded cornice and a surmounting sculpted figure of Faith; shallow obelisk behind, of dark grey figured marble, and a shaped grey marble apron with wreathed heraldic roundel. Finally is a large grey marble benefactors' board on a black marble background, dated 1787; this again originated in old St Peter's.
Nave, N wall (all removed from the old church): simple classical monument in white and grey marble to Joseph Ablett Esq, of Llanbedr Hall, d.1848. Next, a Grecian mural tablet in white marble to John Jones of Jesus College, Oxford, Archdeacon of Meirionedd, d.1835; this has a surmounting draped and gadrooned urn with a black marble obelisk behind. Finally, a simple tablet to William Greene, Rector, d.1782, together with his wife Sidney d.1798 and later family members (erected 1823). In the porch is a particularly fine early C14 sepulchral slab fragment, found at the old church within recent years.
Stained and painted glass: the chancel E windows are contemporary with the building and are fine figurative panels by Clayton and Bell. The W window is in early C13 style and shows scenes from the Passion. The nave N windows are firstly a fine memorial window of 1886 (in memory of Jane Bacon) and (to the W) a memorial window of 1918 to Dr G Crace-Colbert; the nave S windows are by Shrigley and Hunt, 1898.