Brondyffryn Farm, including associated walls fronting the lane

Brondyffryn Farm is an L-shaped, two-storey farmhouse and barn group, constructed with whitened rubble and whitened brick on the inner courtyard side of the farmhouse. It features a slate roof that is hipped at the corner and has plain brick chimneys. The courtyard side of the farmhouse has three bays, with a central entrance that includes a boarded door and a plain overlight. This entrance is flanked by 12-pane unhorned sash windows on both floors, all featuring projecting stone sills and segmental heads. The entrance and left window are set within reduced depressed-arched cart or coach bays. The upper windows extend above the eaves and are set in gabled dormers with pierced bargeboards.

On the road-facing side of the farmhouse, there is a boarded entrance from the early 19th century, accompanied by a 3-pane overlight and a small 4-pane window above it. To the left, there are 12-pane sliding sash windows on both floors. The left return features a similar sliding sash window along with a 6-pane sash window on the first floor.

Attached at a right angle to the right side of the farmhouse is an integrated barn range, which begins as a continuation of the house. This section has a cambered, boarded entrance and 6-pane windows to the right. Beyond this is the barn, which has a large cambered entrance with boarded doors and a vent slit to the left. To the right of the barn entrance is an outshut that includes two cambered, boarded entrances with pegged frames, as well as a cambered window to the right, alongside plain modern windows.

In front of the farmhouse, there is a rubble wall approximately 1.5 to 1.8 meters high that encloses a triangular garden and runs to the left, parallel to the lane. This wall bounds the lane opposite the walls of Tros-y-Parc and Llys-y-Coed, terminating at the junction with a farm building that is positioned at a right angle to the road.

The interior was not inspected during the survey.