Great Tresenny Farmhouse also known as Upper Tresenny

This is a substantial 17th-century farmhouse, known as Great Tresenny Farmhouse or Upper Tresenny. It is constructed of whitewashed rubble stone with brick end stacks and a slate roof. The house is two storeys high with an attic. The entrance doorway to the cross-passage is positioned off-centre and has a flat head, with a plank door fitted with strap hinges. The hall, located to the left of the cross-passage, features a late 17th-century three-light transom window on the ground floor. To the right of the cross-passage, the ground floor has a blocked doorway with an inserted window, followed by a central mullion window with four panes on each side. An 18th-century 12-pane iron-framed window illuminates the parlour. On the first floor, from left to right, is a tiny round-arched stone light to the fireplace stair, a four-light sunk-chamfered mullion window, an upper loading door with two fielded panels, a former four-light diamond mullion window, of which only the central mullion survives within a chamfered frame, then a 20th-century casement retaining a 17th-century angled dripstone, and finally a tall two-light mullion window that is now blocked. The north gable has a two-light window to the fireplace stair (right) and 17th-century two-light mullion windows on the ground and first floors (left), the upper window having a bar dripstone supported on shaped brackets. The rear elevation retains more visible features from the original house. From the right, it displays a three-light mullion window in a false mitred frame on the upper floor, with a similar window below, followed by the cross-passage entry. The original passage entry, with monolithic jambs, has been reduced in width and features a segmentally arched head with voussoirs and a keystone, along with an 18th-century door with beaded boards and strap hinges. To the left of the cross-passage is a 20th-century window, followed by a late 18th-century nine-pane metal casement, mirrored by a similar window above.

The farmhouse follows a three-unit plan with a cross-passage, leading to a hall to the left and service rooms and a parlour to the right. The cross-passage ceiling joists are chamfered with diagonal stops. Fine early 17th-century post and panel partitions with four-centred arched doorways separate the rooms on either side of the cross-passage; a blocked doorway with an original door from around 1600 is positioned to the left, while the remaining three doorways have 20th-century boarded doors. To the right of the cross-passage are two small service rooms, divided from the adjoining parlour by a transverse post and panel partition. The parlour has deeply chamfered beams, also with diagonal stops. Flanking the fireplace (left) is an opening with a finely worked stone keel moulding to the right jamb, likely reused. The attic, directly above, has similar keel moulding, implying a former fireplace stair existed in that location. The attic features collar and tie beam trusses and two rows of purlins. (The north end of the house was not accessible for inspection during resurvey.)