Nos 1 and 2 Tan-y-Castell

Nos 1 and 2 Tan-y-Castell is an L-shaped, two-storey farmhouse that has been divided into two separate dwellings. The building is constructed of rubble and partly sits on a boulder plinth, featuring slate roofs and plain stacks with weathercoursing and cornices. The eastern gable stack projects and is gabled. The southern side, which faces the garden, has a raised central section with three windows and lower flanking sections. There is an off-centre modern gabled porch on the central section, which has a plain bargeboard. The windows are 20th-century two-pane casements, with those on the upper floor set within gabled half-dormers; the central upper window is leaded. Similar windows are found in the two-bay left and single-bay right sections on both floors. The northern side also has similar windows and a modern gabled porch on the left. To the right, there is a small projecting storeyed wing facing north, which has a modern part-glazed door on the left and windows matching those elsewhere, along with a plain end chimney. Attached to the eastern gable is a large late 19th-century slate tablet with a Welsh dedication inscription and the names of 'three ministers and one deacon,' who were brothers, along with the names and dates of their sisters.

The interiors are largely plain and date from the late 19th century. In No. 2, there is a former 'preaching room' that features a fireplace bressummer inscribed with the date 1735 and large-field pine dado panelling on the walls, which appears to be from the 19th century.