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Llwyn-onn, Tanat Valley

A Grade II* Listed Building in Llangynog, Powys

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Latitude: 52.826 / 52°49'33"N

Longitude: -3.3783 / 3°22'41"W

OS Eastings: 307229

OS Northings: 326274

OS Grid: SJ072262

Mapcode National: GBR 6P.V1VF

Mapcode Global: WH78T.27LC

Plus Code: 9C4RRJGC+9M

Entry Name: Llwyn-onn, Tanat Valley

Listing Date: 4 March 1974

Last Amended: 23 May 2003

Grade: II*

Source: Cadw

Source ID: 81051

Building Class: Agriculture and Subsistence

Location: To the north side of the Afon Tanat, about 2 km east of the village of Llangynog. The upper part of the house is sunk in a hollow and the lower part of the house is built on a raised platform.

County: Powys

Community: Llangynog (LLangynog)

Community: Llangynog

Locality: Tanat Valley

Traditional County: Montgomeryshire

Tagged with: Building

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A cruck-built hall and byre of the C15/16 sited north/south and markedly downhill, with an early C19 side wing. The earlier part was probably originally timber framed, but has been rebuilt in stone.

The earlier part is on two levels, hall above and byre below, but it is unclear whether there was originally an internal communication between them, or a cross-passage at or near the chimney position. A chimney serving the hall was inserted at the change of level, perhaps in the early C17. The doorway communicating with the later (early C19) house is probably not an original opening.


The earlier (downslope) range is of 1½ storeys, but only the domestic upper part of this range is lofted. Quasi-rubble slate walling apart from the gables to north and south, which are timber-framed. Small random slates in graded courses on the east side, corrugated sheeting on the west side, tile ridge, mid-chimney truncated to just above ridge, the stack lost. The east side was the original front facing the farmyard and is painted white.

The upper domestic part of the earlier range faces east. The doorway to the hall (not opposite the chimney) has a timber lintel and boarded door. Two dormer windows and two lower windows, not quite aligned, all of two lights. The dormers have catslide roofs, one slated, the other sheeted. One opening to rear (west) has a steel window. The lower part of this range faces west: three doorways with timber lintels; boarded doors, that to the right (south) is a heck door.

The C19 wing on the east side is a two-storey and three-window structure of considerable character in its own right, in similar materials. The stonework of this part is painted white apart from the chimneys. One end-chimney and one chimney abutting the earlier house. This later wing is fenestrated to the front only. Three-light mullion and transom windows above against eaves; similar but larger windows below with segmental arches. No sills. Boarded front door with similar arch.

The stone platform on which the lower part of the early house stands has been extended to form a front terrace and raised yard to the later wing. Lean-to sheds at the gable of the early house with corrugated roofing; one partly filled in concrete blockwork. Kennels formed in the extended part in front of the later wing.


The earlier range of the house has a central (probably inserted) chimney with hall to the north and beyond the hall two small inner rooms. To the south of the chimney and at a considerably lower floor level there is a byre, the end bay of which was probably a stable. There are four bays with three cruck frames: the first separates the inner rooms from the hall, and incorporates a tongue and groove planked dais partition with two pointed-headed doors (the angle of the cruck forming part of the doorhead shape); the door to the left, possibly to the parlour, survives. The second cruck frame is at the chimney position and the third is within the byre.

The entrance to the earlier range from the C19 range is by a doorway opposite the chimney and a short flight of stairs up.

The later wing is planned symmetrically with a central bay containing the stairs.

Reasons for Listing

Listed at grade II* as a survival of an exceptional sub-mediaeval house related to the longhouse tradition with cruck framing and other original constructional features, coupled with a C19 late vernacular wing which has retained its character well.

External Links

External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.

Recommended Books

Other nearby listed buildings

  • II Glanhafan-fawr farmhouse
    At the rear of a farmyard at the east side of the Tanat Valley, reached by the B4391; about 2 km north-west of the village of Penybontfawr. Front garden with low wall.
  • II Barn at Glanhafan-fawr
    To south of the house at Glanhafan-fawr.
  • II Bryn Glas
    To south side of the B4391, about 1 km east of the village of Llangynog. Small yard and farm range at rear.

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