Trellyniau Fawr

Trellyniau Fawr is a two-storey house situated on a sloping site. The main range is constructed of painted rubble with a slate roof and brick stacks at the ends. The stack on the left-hand side was originally an external gable stack and has been rebuilt in brick over stone. To the left, on the downhill side, is a lower wing set at an angle, which served as a secondary dwelling and has its own stone end stacks. A 19th-century extension is set against the uphill gable end and first appears on the 1870 Ordnance Survey.

The main house features a four-light mullioned and transomed hall window with ovolo mouldings in the centre of the left-hand side. To the left of this is a lean-to brick porch with an opening in the side wall, containing a 19th-century boarded door that originally opened into the hall. Further to the left is a smaller two-light plain-chamfered mullioned hall window. On the right-hand side is a three-light mullioned window with a plain chamfer and drip stone. The upper storey has a three-light window to the left and a two-light window to the right of centre, both with wooden frames. The 19th-century extension against the right-hand gable end has a glazed door on the left and a two-light casement above. The wing at the downhill end has a boarded door on the right-hand side, a two-light wooden casement to the left, and a two-light window above. A conservatory has been added against the gable end of the wing. The three-window rear wall of the wing incorporates a replaced door with a brick segmental head lower on the left, and two two-light casements at a higher level to its right. In the upper storey are a cross window to the left, a two-light window in the centre, and a three-light window to the right – all 20th-century replacements raised above the eaves.

The rear of the main range has two two-light casements in the upper storey, above a lean-to with a boarded door and a small fixed window to its left.

Inside, the original hall and parlour have been combined into a single room. Three cross beams retain some original stop-chamfered joists and feature run-out stops. The hall fireplace has a stop-chamfered lintel. A 17th-century doorway with a wooden frame and Tudor head is set within the rear wall of the hall and may have originally led to a stair turret. The main range has boarded doors. The doorway connecting the hall to the wing at the downhill end has a panelled door and reveals. This building demonstrates group value through its historical development and architectural detailing.