Interior
The porch has a segmental tunnel vault. The S doorway, rebuilt in 1859, is reached up steps and has a continuous chamfer and boarded door with strap hinges. To its R is a small corbelled stoup.
Nave and chancel have a pointed arched-brace roof of 4+2 bays. The 3-bay N nave arcade has plastered pointed arches. A similar but wider arch is to the S transept, which also has a squint, and from chancel to N chapel. The N aisle and chapel have a similar arched-brace roof to the nave and chancel, while the transept has a roof of closely-spaced scissor braces, and has been converted to a vestry with fireplace in the N wall. Seven-bay wooden screens, each with boarded dado and cusped lights, separate nave from chancel, and aisle from chapel. A panelled screen is between nave and vestry. In the chapel the altar has been removed and C18 and C19 grave slabs have been set up around the E and N walls. In the chancel is an ornate tiled reredos with stone bench around the sanctuary walls.
The square Norman style font has a scalloped underside, squat round stem and square base, apparently reproducing an earlier font in the church. Plain panelled pews and pulpit are of 1860. The communion rail has cusped arches infilled with iron bars.
The chief monument is a wall tablet in the N wall of the chancel commemorating Catherine Mansel (d 1631). In classical style and comprising a slate inscription panel in freestone surround of double Ionic pilasters, entablature, and achievement with coat of arms. In the N wall of the aisle is a monument erected c1809, by D Mainwaring of Carmarthen, to Thomas Humphries and family. An alabaster panel is surmounted by a partly broken urn, on a lozenge-shape slate background. Further L, a simple wooden tablet commemorates Private D Davies (d 1917).
Several windows have stained glass. The E window shows Christ flanked by angels, with the Mansel family monogram in the tracery lights. In the N aisle, beginning at the W end, is Christ as the Good Shepherd, by Charles Gibbs senior of London, after 1864, and the Good Samaritan, c1869. In the chapel E window is coloured glass with 1844 in the tracery light.