The chapel comprises one large room, divided by slender C18 roof trusses into 6 bays. Walls are plastered and segmental plaster vaulted ceiling. Stone flagged floor. The tie beams are chamfered and are supported on central chamfered posts to the floor. Slender raking struts to rafters behind the ceiling. On the internal gable, an encapsulated cruck couple with traces smoke blackening of the medieval house, the tie beam removed, and stopped half-dovetail for a trenched collar, the collar now removed to a higher level. Jambs of a blocked opening pre-date the cottage stair. On the centre of the N side, a raised pulpit with panelled front. On either side a rectangular panelled boxed pew with angled bookrest, and similar boxed pew opposite, and a further late C17-early C18 elongated pew with ogee-edged planks in the SE corner.
A range of wall monuments of interest to the history of C19 non-conformity in the district. On S wall, (a) slate tablet to John Reid, †1832, and wife. On E wall, from S, (b) painted limestone, 1 top and 2 lower panels by William Bevan of Merthyr, to Elizabeth Bowen †1818; (c) Limestone tablet with inset ogee headed panel and cornice, to Revd Richard Lloyd of Glanyravon, Lambeder, †1840; (d) slate tablet by Morris of Hay, with side pilasters, cornice and urn within ogee top, to Mary Lloyd, †1840; (e) Catherine Powel Tuck of Noyadd, Llanstephan †1864; (f) fluted pilastered panel with fan top, to Ann Jones of Broynllys Cottage, †1826; (g) Painted slate tablet with low relief, gadrooned at base, fiery urns, to Thomas Gwenllian Jones of Trecastle, †1846; (h) painted stone with segmental top, by T.Hughes, to the 3 offspring of John and Joan Prosser, after 1844; (i) painted limestone tablet with shaped top containing low relief urn, the inscription divided vertically, to David Williams †1851; (j) Limestone tablet with horned top, to Ann Prosser †1869. On the W wall, (k) a gabled limestone tablet to Thomas Prosser, †1858.