Pen-y-Groes

Pen-y-Groes is a single-storey house built from whitened rubble on boulder foundations, topped with an old slate roof made of heavy, graded small slates. The roof features a tiled ridge, crude gable parapets, and tiny loft lights. The house has squat end chimneys that include weather-coursing and capping.

The entrance is deeply recessed, with an old boarded door located to the left of the center. To the left of the entrance is a small 4-pane window from the late 19th century, set in its original opening. To the right of the entrance, there is another lower entrance with a window to the right, similar to the one on the left.

Attached to the right gable end is a lower 19th-century lean-to that has a rectangular 6-pane sash window on the front. A modern slate plaque on the building marks it as the birthplace of Richard Owen.