At Bryn Du is a small house with its own enclosures upslope and to the south of the settlement at Rhos Gelligron, NPRN 402595. It is a well-constructed building built of rubble and measures 8.2 metres roughly east to west by 5.5 metres. The gable at the western end is still nearly full height but leaning inwards, with a fireplace and small window, 0.50 metres by 0.60 metres high up to the right of the fireplace. The other gable stands up to 2 metres high but again is leaning inwards. The remains of the other two walls are between 1.5 and 2 metres high. The door is placed centrally in the north wall with a small window either side. The window lintels are missing but the stone sills are still in place. A small outbuilding was attached to the western end, measuring 2.75 metres east to west by 4.45 metres. In front of the house was a garden or small paddock, NPRN 529347, with a larger paddock behind, NPRN 529348. Previously surveyed c1974 when it was described as a '18th-19th century ruinous single storey cottage with attic or croglofft. Built of rubble in clay which formerly had a wickerwork chimney'.

J. J. Hall, Trysor, 2nd February 2013