Agricultural Range known as 'the Barn' at Heol-ddu

Tall two-storey building in rubble sandstone masonry with dressed quoins, slate roof. Three-opening front elevation facing south-west to the main farmhouse: central heck door (1.22m wide), walled up windows, and 3 evenly-spaced square loft openings above; boarded doors (not original) and timber lintels. Similar size heck door centrally at rear. Stepped down to left end is an added low outbuilding, also rubble with slate roof. Ruinous pigsty to rear. The right elevation has a central door and a large walled-up opening above. Left gable elevation largely concealed under ivy.

Five-bay roof structure with light collar-beam trusses. In the rear wall are two rows of three ventilator holes, in the left gable three rows, of two, four and four holes respectively, all blocked. Possible marks of a loft or upper floor at left. A shaft for belt-pulleys survives at the right, but no other machinery.