Barn and attached ranges at Pen-Cilau

The barn and attached ranges at Pen-Cilau is a large structure built from masonry rubble and topped with a slate roof, featuring a later wing that extends at right angles. The main barn has a wagon bay located just north of the center. On the east side, there are boarded double doors beneath a slate-covered canopy, with three pairs of vertically aligned ventilation slits to the left and two pairs to the right. A boarded door is situated at the right end. The west side, facing the courtyard, has metal doors flanked by matching ventilation slits, and to the left, there is a window that likely used to be a door. The south gable end includes two ventilation slits and a loft hatch. To the north, there is a lower range that features a window beneath a long timber lintel on the east side. This range was extended to the west in the 19th century, where it connects to the downhill range of the house. The extension consists of two bays, with the western bay containing a wide through-passage that provides access to the courtyard and the house. Adjacent to the western end of the extension and the north gable end of the house is a small lean-to stable.

Inside, the barn has a six-bay layout supported by queen post trusses, with some beams slightly chamfered. The wagon bay features a stone threshing floor, and there is a raised loft to the north with a door leading to a basement cow-house. A further raised area is located to the south of the wagon bay. Two doors connect the basement cow-house to the later lower range. At the top of the wall, two ventilation slits are visible, one of which has been converted into a small window. Most of the west wing and this area were utilized as milking parlours in the 20th century and contain concrete partitions and floors. The western bay of the west wing includes a through-passage with a cobbled floor and queen post trusses.