Boiling house and Pigsty at Tre-Ddafydd-uchaf

The building consists of a single-storey boiling house to the west and a pigsty to the east, separated by a high-walled yard. The walls are made of rubble with contrasting limestone dressings, and both structures have gabled roofs covered with modern slate.

The boiling house features a brick chimney on the south gable and a central doorway in the gable end, which has cambered brick heads with a drip course and a rectangular, small-paned overlight above. There is a tall vent slit located above the doorway. Along the base of both long walls, there are blocked feeding chutes with slate lintels. The pigsty has a similarly styled door, although it lacks a fanlight and is offset to the left. The vent above the pigsty door is shorter and offset to the right. The west wall of the pigsty, which faces the yard, has been rebuilt using breeze blocks.

Both buildings are composed of two bays and feature modern collared trusses. Additionally, there is a low stone plinth along the rear gable wall of the pigsty.