Trewyn Farmhouse

Trewyn Farmhouse is a three-storey building with attics, dating from the 17th century. It is cement rendered, likely over red sandstone rubble, and features a Welsh slate roof. The structure is a large rectangular block with an end entry and has a cellar accessed from the gable where the ground drops sharply. The entrance gable is blind and includes a plain door with a flat hood positioned to the left of the chimney.

On the farmyard elevation to the north, the rocky plinth is visible, and there are two windows on each floor. The ground floor windows are three-light timber casements, while the upper floor features one two-light and one three-light window, arranged in a seemingly random pattern that may be original to the 17th century.

The east gable has a plain door leading to the cellar, a small window on the ground floor, and a large chimney stack that likely represents a later addition to what was initially an unheated end of the house. There is also a four-pane garret window in the gable.

The rear (west elevation) contains three windows and a door on the ground floor, along with three additional windows above, showcasing a mix of casement types, all of which date from the 19th century. A window to the cellar is located at the right-hand end of this elevation. The roof features overhanging eaves and end gable stacks; the eastern stack is external as noted, while the western stack is built into the wall of the house, suggesting it is from the 17th century. Both stacks are made of rendered stone with weathered caps.

The interior details were not available during the last survey in April 1997.