Former House and adjoining Washhouse at Plas Uchaf

The former house and adjoining washhouse at Plas Uchaf is a storeyed rectangular building constructed of rubble on boulder foundations, partly on rock. It has a modern corrugated iron roof and the chimneys have been removed. The corners feature roughly-squared quoins. There is a blocked entrance to the left with a boarded loading bay above to the right under the eaves. The off-centre entrance, which has been altered from its original form, features a 19th-century cambered brick head and a boarded stable door. Flanking this entrance are two primary window openings with later brick heads; the windows are sash style with 6-pane upper sections, now with boarded lower halves. To the right, there is a further modern window. This section of the building has been partly reduced and has a mono-pitch modern roof, with a basement entrance located at the gable end on the right. The rear of the building shows remains of corbelling on the left side at the raised ground floor, which relates to a former lateral chimney and likely an adjoining garderobe. There is a slit light to the right, and beyond this is an area of disturbed masonry indicating a former entrance.

Adjoining to the left, set back and stepped down, is an early 19th-century single-storey washhouse. This structure is also of rubble construction, topped with an old slate roof and featuring a squat chimney on the left gable. The washhouse has an off-centre entrance to the right with a 19th-century boarded door, and a small 19th-century 8-pane casement window to the left.

Inside the former house, there is a good quality beamed ceiling with crisp stop-chamfering on the beams and joists. The grooved underside of the beam on the right indicates the presence of a former post-and-panel partition. On the left gable wall, there is a former hall fireplace that is now blocked; it is especially wide, measuring almost 4 meters, and has a large flat bressummer, although its chamfering is now obscured. There is a blocked window and entrance on the rear wall, with oak lintels expressed internally. Beyond this, to the right, a partial void in the wall thickness suggests the possible location of a primary mural stair. A modern stair is located on the right, along with a modern roof structure and a later dividing wall between the hall and parlour ends. The basement room features a re-used stopped-chamfered main beam with a blocked opening to the east.

The washhouse has a two-bay roof supported by a crude collar and tie-beam truss, and a large staged stack is located on the left.