Heol-ddu farmhouse

Heol-ddu farmhouse is a two-storey building with an attic, featuring a front made of whitened rubble masonry and rendered surfaces elsewhere. It has a slate roof with a small overhang and gable-end stacks, including a large chimney with offsets to the rear wing. Beneath the rafter-ends of the main elevation are the brackets of a former boxed eaves. The front displays a broad, symmetrical three-window arrangement facing north-east towards the farmyard. To the right, there is a lower single-bay extension built in coursed rubble, along with a lower rear kitchen or scullery wing. A separate low rear store-room wing with a lean-to roof is attached to the right side of the rear elevation.

The farmhouse features 12-pane hornless sash windows with dressed stone cambered heads flanking and above the wide central doorway. The restored door is vertically boarded and has a simple three-pane overlight under a cambered head. There is one 12-pane sash window in the right extension, and restored six-pane attic windows are present on each side of the chimneys in the end elevations of the main range. Additionally, there is a restored 12-pane sash window on the left elevation at ground storey and a 20-pane hornless sash window beside the kitchen extension. The rear includes three restored doors.

Inside, the entrance lobby is centrally located with the kitchen to the right, stairs and cellar access in the middle, and a parlour to the left. The structural plan of the roof and upper floors consists of five bays, with the central bay widened for the stairs. The roof trusses are of the high collar-beam type, marked with carpenter's numbers from right to left. The extension and kitchen wing also feature high collar beam trusses.

In the entrance, there is a boarded door leading to the kitchen and six-panel doors to the cellar and parlour. The kitchen contains an open fireplace with a bread oven on the left and stone floor paving. There is also an open fireplace in the cross-wing, which has a restored bressummer and a large oven on the right.