Trefeca College Farmhouse (Trefeca Isaf)

This is a large, late 16th-century farmhouse, significantly altered in the mid-18th century. It is constructed of rubble sandstone with slate roofs, the southern end being hipped. The main house is two storeys high, with a two-storey and attic cross wing to the north and a matching two-storey and attic porch set into the angle between the main range and the cross wing. A large 18th-century wing extends to the rear.

The porch has an open-fronted moulded Tudor arch, leading to both the cross wing and the main house. The main house entrance has a counter-boarded and studded door set within a bracket-moulded stone doorcase. The porch was altered in the 18th century when a small window on the south side was blocked and replaced with a seated alcove, and the ceiling was given a plaster dome, incorporating a stone tiled floor. Above the door is a sandstone slab with a moulded margin and four angels displaying shields arranged within a circular design. The slab is recorded as having the inscription 1576. A 20th-century two-light window and a lunette are visible on the first floor gable.

The north cross wing, likely originally a parlour with a kitchen to the rear, has 20th-century transomed timber windows and a lunette window in the gable. A stone stack projecting slightly from the front corner of the room causes the gable to be off-centre.

The main range was stuccoed and originally featured Gothick ogee-headed windows, now replaced with 4-light 19th-century sash windows. Two of these have been replaced with 3-light ogee-headed windows with intersecting tracery, reflecting the original 18th-century appearance. A large opening, formerly for vehicle access, is located on the ground floor of the end bay. Similar replica windows are found on the end elevation. A 20th-century replacement cross-passage door is positioned on the rear of the main range, alongside a low round-headed door with giant rounded lintel stones. Above this door is a high 17th-century window with 3 lights. Further back, a triple ogee window, and a single window above featuring replaced intersecting glazing bars, are visible. A similar triple window survives further south of the rear wing. The rear service wing, built between 1768 and 1772, features mostly blocked, reset transomed windows with 5 and 6 lights.

Inside, a cross passage leads from the front door. To the left of the passage is a hall, later used as a college chapel, separated by a screen. Parlours are located to the right. There is a stack on the rear wall, containing a fireplace and oven serving the kitchen in the rear wing. A staircase leads to the upper floor, and a cellar is located beneath the front parlour.