Treassowe Manor House

Treassowe Manor House, originally Treassowe Farmhouse, is a manor house dating back to the 17th century. It incorporates earlier masonry and was remodelled and extended around the early 19th century. The building is constructed of granite ashlar and granite rubble with a dry Delabole slate roof, and features rendered, embattled chimney stacks over the original gable ends.

The original layout was slightly irregular in an L-shape, initially one room deep with two rooms at the front and a service range at right angles. Around the early 19th century, the front wall was rebuilt as a garden front, and the plan was deepened to create a double-depth layout under a single roof. An axial passage connects a large entrance porch with a classical style, Tudor-style doorway, to a central rear stair hall. The early 19th-century rear wing was reduced to, or rebuilt as, a single-story kitchen. A 17th-century rear entrance doorway to this kitchen is near the inner angle and illuminated by a 17th-century window. Adjacent to the right side of the kitchen, and extending nearly parallel, are the ruins of a late 19th-century range of domestic buildings featuring three large fireplaces and dressed, coursed granite masonry. Medieval dressed stone fragments are present in the garden.

The south-east garden front is symmetrical with four windows and displays a granite ashlar plinth and 19th-century 12-pane hornless sash windows. The left side has an ashlar porch with a four-centred arched doorway and pilastered corners, along with a 12-pane hornless sash window. The rear also features 19th-century sashes, including a tall, round-headed stair sash. A 17th-century three-light chamfered mullioned window is on the left-hand wall of the rear wing, above a doorway with a reused medieval moulded pointed arch over broad, chamfered jambs, with dice stops, dating from the late 16th or early 17th century. The interior has not been inspected.