Interior
The porch is the base of the tower. The springing of the first-floor vault remains on all sides, but the crown is absent and replaced by a timber floor. In the porch the ancient Caercastell Cross is displayed, named from the field in which it was found: a shallowly carved wheel-head cross now in two pieces, with an inscription recording Elmon, or Elmat, 'fecit hanc crucem'; remainder of reading disputed.
The interior is remarkable for the lack of architectural division between nave and aisle; plain overall flat ceiling simply divided into two by a slight lateral rib, with another rib around the perimeter. There are pine pews in four ranges. Low plain-chamfered chancel arch, and a similar arch, blocked, which formerly led to the space which is now the vestry. The chancel is one step down from the nave, and its axis is noticeably inclined to the right of the nave axis; barrel-vault ceiling divided by ribs into square panels. The east window is dated 1865, in memory of David Williams of Abercothi, and depicts Christ between St Peter and St John. In the toplight is Moses with the tablets. The central south window is in memory of John Thomas Davies, 1913, who was the donor of the four bells. The window depicts the Resurrection and the Ascension. The body of the church has a small number of fine C18/C19 wall monuments. At north, a marble monument to William Rees of Capel Dewi, d.1759: broken pediment with urn; thin brackets and dark pilaster strips; ornamental apron beneath shelf. To its right is a Gothick monument to E H Adams of Middleton Hall, carved by E Griffin of Regent Street, 1843: figured cream marble with trefoiled inscription panel; side buttresses; small shield of arms on centre finial. Against the east wall is a monument dated 1848 to Mary Williams of Glasgoedfawr, sculpted by J Jones of Llanddarog; broken pediment with bust. At south, a monument, dated 1847, to Sir William and Dame Ann Paxton, died 1824 and 1846: broken round pediment with crested shield of arms and motto; Ionic pilasters; large consoles; inscription within an arch below the entablature; low relief portraits in the apron beneath.
Octagonal font in one stone, of hollowed profile. Organ c1900 by Nicholson of Worcester.