Treyarnon Farmhouse

Treyarnon Farmhouse is a house built around the early 19th century, with an extension added in the mid-19th century. The building is constructed from stone rubble and features a slate roof with half-hipped ends, along with axial and side stacks that have rendered brick shafts. Originally, the house had a double depth plan with a central entrance, consisting of two main rooms at the front heated by side stacks, a stair at the rear of the central passage, a dairy to the rear left, and likely a back kitchen to the rear right. The mid-19th century extension added a service range on the left, which includes a kitchen heated by an end stack, a dairy, and a service outshut at the rear left.

The exterior of the farmhouse is two storeys high, with a regular 2:3 window arrangement that shows the mid-19th century extension on the left and the earlier range on the right. The openings have dressed stone flat arches. The original house has a symmetrical front featuring a 19th-century door at the centre, likely with a 20th-century glazed porch in front, flanked by two 12-pane early 19th-century hornless sash windows, with three more above. The later extension on the left has a two-light casement on the ground floor and two 19th-century hornless sashes above. The rear elevation includes complete early 19th-century hornless sashes.

Inside, the principal room to the right features a late 18th or early 19th-century carved timber and plaster classical chimney-piece, along with a moulded plaster cornice decorated with intertwined bunches of grapes and an egg and dart motif. There is a Delabole slate chimney-piece with a register grate from the circa 1840s in the left room, and another similar chimney-piece in what was likely the original back kitchen, which became a breakfast or morning room after the mid-19th-century service range was added. The original dairy was converted into a small unheated rear hall around the mid-19th century. The staircase, dating from the early 19th century, features a ramped rail, turned newels, and stick balusters.