Trethennal Manor Farmhouse Adjoining Wall, Gate Piers And Mounting Block

The farmhouse, dating from the 17th century, was remodelled around 1700. It is constructed of dressed and coursed slatestone to the front, with slatestone rubble elsewhere. The roof is covered in scantle slate, hipped to the main range, with brick chimneys on the side walls and over the gable to a wing. The building has an L-shaped plan, with a long, single-story range attached to the west. Originally, it may have been a double-depth, two-room design with a central stair plan, and possibly originally a U-shaped building with a wide passage. The symmetrical south front, featuring five windows, was likely rebuilt around 1700. A hipped-roofed porch shelters the central doorway, with a side entrance to the left, which has HL hinges on a 20th-century planked door. The windows are predominantly 12-pane and 24-pane sashes, with three original sashes with heavy ovolo-moulded glazing bars on the first floor middle and right. Much of the original glass remains. Flat arches define the openings, and the building possesses a robust, moulded eaves cornice. The rear roof slopes down to lower eaves, interrupted by a raised hip roof over the stairs, featuring a tall, margin-glazed sash. A flat-roofed dormer with a 2 casement window of 6 panes each is located to the left. A surviving 3-light, ovolo-moulded, unglazed oak mullioned window with diagonally set wooden bars is found in a ground floor room partially under the stairs. Wide window openings are present on the east wall of the north wing, including a 3-light 20th-century casement, and a hornless sash window with sidelights above. The long cob range to the west, likely dating from the 17th or 18th century, was originally thatched. Inside, remnants of the 17th century are visible, including a 2-panelled door with wide stiles and rails, a wide passage beside the stairs, and a lower ceiling in the upper end of the ground floor room. Significant features from around 1700 remain, such as a dogleg staircase with turned balusters over a closed string, shell-headed cupboards in the east room (the parlour), a fine plaster ceiling with a bolection moulded oval design in the parlour, three canopied ceilings with moulded cornices on the first floor, a moulded cornice to the vestibule, and 2-panelled doors to most rooms. A hearth in the west range with a bread oven retains an adjustable iron chimney crane. The listing also includes a high slatestone rubble garden wall, parts of which are incorporated into a lean-to abutting the east end of the house. Present are a slatestone rubble mounting block, and a fine pair of brick gate piers, likely dating from around 1700, with rebated corners, square plinths with freestone mouldings, a freestone cornice, and cap stones. The gate is a simple 19th-century wooden design.