Trethowel Farmhouse

Trethowel Farmhouse is a farmhouse dating from the late 18th century, accompanied by adjoining garden walls to the north and northwest. The building features slatestone rubble walls with a stuccoed front and an asbestos slate roof that is half-hipped to the left (northeast). Brick chimneys are located over the side walls, on the left, and at the gable end on the right, as well as over a rear wing that has a corrugated iron roof. The layout consists of two rooms flanking a central stair, with a service wing at a right angle to the rear of the northeast end. Originally, there was a farm building attached to the southwest end of the house, but this was demolished around the 1960s.

The farmhouse is two storeys high and has a nearly symmetrical three-window front facing northwest. The doorway is slightly off-centre to the right, featuring an open pediment doorcase with modillion brackets. Above the door, a round-arched opening rises into a tympanum. The door itself has six fielded panels and an integral eight-pane overlight. The window openings have slate sills and keyed cambered arches, with all original hornless sashes made of crown glass. The ground floor windows are taller, with 16-pane sashes, while the first floor has 8-pane sashes. The rear wing includes original wide tripartite sashes and timber lintels, with a wide four-light window illuminating the stair and returning with one light to the rear wall. A straight joint underneath suggests that the stair window was originally taller, indicating that the wing may be slightly later. There is a four-panel door located under the middle lights of the window. The building has cast iron ogee gutters.

Inside, the farmhouse is very intact, featuring original six-panel doors with fielded panels, architraves, window shutters, and plaster ceilings. The front rooms have moulded cornices and bands. The open-well stair is adorned with stick balusters and plinths. Although the first floor rooms and roof structures were not inspected, it is noted that the roof over the wing is of much cruder construction, using partly hewn timber. A slate-coped rubble wall adjoins the north corner and continues parallel to the front of the house as a low-coped wall topped with hooped wrought iron railings. There is a central gateway with dressed granite piers and a single-braced iron gate designed for self-closing.