Lower Pontgwilym

Lower Pontgwilym is a farmhouse constructed from squared purple stone, topped with slate roofs. It features a prominent stone ridge stack with three conjoined square shafts, separated by narrow arched slots and adorned with a cornice. The building is two-storeys tall and has a T-shaped plan, with the entrance located at the rear wing.

The exterior includes a plinth and rock-faced stone bands above each floor, along with overhanging eaves and verges. The verges are decorated with moulded bargeboards that have slight cornice returns, resembling open pediments. The windows are framed with purple stone lintels that have incised imitation voussoirs, and tooled stone sills. Originally, all windows were hornless 12-pane sashes.

The front facade has three bays, featuring a large curved-backed niche at the center of the first floor. The arched head of this niche breaks through the upper band and is supported by stone voussoirs. There is one window on each side of the niche on both floors, with the windows on the left being slightly narrower. The original 12-pane sash window is located on the ground floor to the right, while the upper floor has 20th-century 12-pane hopper windows and a 6-pane sash on the ground floor to the left. The right end gable has a 4-pane blind window in the attic, a 20th-century 12-pane window on the first floor, and an original 12-pane sash on the ground floor.

The rear wing, which is set back to the right, has a slightly lower roof, a plinth, and one stone band. It features two bays offset to the left with original 12-pane sashes and a door in the left bay. Access to the six-panel door, which has two flush panels, four sunk panels, and a three-pane overlight, is via three stone steps. The door is framed in a painted timber doorcase with pilasters, a frieze, and a shelf cornice. The reveals are panelled, and there is a basement light to the right of the door.

The left end gable, made of rubble stone, includes a basement door and one 12-pane sash window on each floor. The outshut at the rear has a large stone chimney on the rear roof slope, a 20th-century upper window, and a pair of barred casements below it, with a gable to the right that has a long 10-pane stair light.

Inside, the principal rooms are located on each side of the entrance passage, with the kitchen situated at the rear of the main range. The interior features six-panel doors and panelled shutters. The staircase has turned newels, square balusters, and scrolled tread ends. The kitchen contains an altered main fireplace with a bread-oven recess to the left, along with two square recesses above the bread-oven and a chamfered beam. There is a service stair leading from the kitchen, which has a board door. Additionally, there is a vaulted basement beneath the rear wing.