Nos 1 and 2 Tan-y-Castell

L-shaped 2-storey farmhouse, now two separate dwellings. Of rubble, partly on a boulder plinth; slate roofs and plain stacks with weathercoursing and cornice. Of these, that to the E gable projects and is gabled. The S (garden) side has a raised 3-window central section with lower flanking sections. Off-centre modern gabled porch to former with plain bargeboard. C20 2-pane casement windows, those to the upper floor contained within gabled half-dormers; the central upper window is leaded. Similar windows to 2-bay L and single-bay R sections, to both floors. Similar windows to N side with modern gabled porch to L. To the R, a small projecting storeyed wing faces N; modern part-glazed door to this at L with windows as before and plain end chimney. Attached to the E gable, a large late C19 slate tablet with Welsh dedication inscription and the names of the 'three ministers and one deacon,' who were brothers, together with the names and dates of their sisters.

Largely plain, late C19 interiors. In No.2, the former 'preaching room', with fireplace bressummer inscribed with date 1735; large-field pine dado panelling to the walls, apparently C19.