Nant-byr-isaf

Nant-byr-isaf is a farmhouse built at a right angle to the slope, featuring whitewashed rubble stone and a slate roof with whitewashed stone end stacks on the main house, as well as another stack on a left end addition. The building is two-storey and double-fronted, with the front offset to the left. It has two small square nine-pane 20th-century windows located under the eaves, above two long narrow hornless twelve-pane sash windows. The doorway is roughly central and is accessed through a 20th-century porch that has a window at the front and a door to the side. The windows have slate sills, which are thin for the upper windows, and brick arched heads.

To the left, there is a further single-storey range with one bay, which is set back slightly and has its end wall built into the hillside. This range features a long 20th-century twelve-pane window with a timber lintel, positioned against the left end of the main house. At the rear, there is a central 21st-century door that replaced a small window.

Inside, the hallway is flagged, with a board door to the right leading to a flagged former kitchen that has a rough-hewn hanging beam. To the left, there is a board door leading into a parlour, and at the rear of this room, three stone steps ascend to an out-kitchen. The hall passage is boarded, with narrow boards on the ground floor and wide boards above. A passageway beneath the stair leads to a rear door. The dogleg stair features square newels and stick balusters.