The building contains much fabric of the C15 including the roof structure, and restored in 1851-3 and later. Walls plastered above a boarded dado. Roof constructed with five/six C15 knee-braced trusses, strengthened in the C19 restoration with iron ties, and having a boarded panelled ceiling over the chancel bay, with inscribed wall plate cornice all round internally.
Fittings: Jacobethan style arcaded chancel screen; octagonal panelled pulpit of 1887. Lectern of oak, in the form of a large angel with spreading wings, carved by Mrs Constance Mary Greaves, an aunt of the architect Clough William Ellis; similarly the font cover in the form of a winged eagle.
Glass: N window by Ward and Hughes, 1896, to Marian Owen of Ymlylch, S Chancel window, a strong geometric pattern by Meyer of Munich, to Elinor S Huddart. In the nave 3 further Huddart memorial windows. In the W window under the bellcote, some good early C16 yellow-stain glass depicting the head of a bishop, vestments with the inscription ORATE LLYN QUI:JAIOC:FENESTRA(m) [expanded as : Ianit pro Meredyt a vean ap Robert et Margerta verch Maurice uxor ejus, qui haec fenestra fecerunt]. He was the grandfather of Sir John Wynn and had 5 wives and 26 children, and died in 1525
Monuments: against E wall, left of the altar, (a) a white marble or alabaster draped cartouche by R Wynne (fecit) putti under the drapes, and coloured arms and crest at the top connected by hanging garlands. To Sir Robert Owen of Clenennau, d.1666, deputy sheriff, Sergeant Major General of the royalist troops in N Wales, who was sentenced to death but reprieved. Below, winged putto, and inscription Sr R O 1680. Long inscription in Latin explaining that John Owen, a soldier, had 'undoubted and evident loyalty to his King, the Blessed Martyr Charles I', and for whom 'the power of God turned back the sharp edge of the Executioner's axe' and that 'Charles II had restored both himself and his own'. On the N side of the Altar, (b) white marble tablet on slate, panel between carved pilasters, to Nathaniel Matthew of Wem and Pakenham, d.1867; (c) on the N wall, a similar monument to last, by L PooL, to May Matthew, d.1852; (d) bronze cartouche to Richard Methuen Greaves of Wern, d.1942; on the S wall of the nave, (e) upright marble panel on slate, round crenel over, by Barker of W Brompton, to Elinor Sophia Huddart of Brynker; (f) carrara marble sarcophagus tablet to Joseph Huddart, aged 9; (g) Sir Joseph Huddart of Bath, d.1841, and son Augustus added; (h) tablet in Carrara marble to Ralph Huddart, son, d.1839. Also (i) tablet to William Maurice of Clenenay, d.1622, and (j) Emanuel Annwyl, d.1646. On the nave N wall a monument to Flt. Lieut Tony Knowles. At the rear of the church a large hatchment of 1870 with arms of Jones-Parry of Madryn, Lleyn, set in a lozenge, and their motto 'Nec timet nec tumet'.