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Caerllwyn Isaf and attached byre/stable

A Grade II Listed Building in Ynysddu, Caerphilly

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Latitude: 51.6336 / 51°38'0"N

Longitude: -3.1773 / 3°10'38"W

OS Eastings: 318616

OS Northings: 193410

OS Grid: ST186934

Mapcode National: GBR HY.87HX

Mapcode Global: VH6DM.W65J

Entry Name: Caerllwyn Isaf and attached byre/stable

Listing Date: 27 January 1982

Last Amended: 16 September 1999

Grade: II

Source: Cadw

Source ID: 1901

Building Class: Domestic

Location: On the W flank of Mynyddislwyn, close to the N/S mountain road which leads S to Cwmfelinfach in the Sirhowy Valley; stands in a walled and gated enclosure with stone stile to field.

County: Caerphilly

Community: Ynysddu (Ynys-ddu)

Community: Ynysddu

Locality: Mynyddislwyn

Traditional County: Monmouthshire

Find accommodation in


Probably C17, roof raised and rear wing added late C19 or c 1900. The two small detached byres flanking the main unit, not included, are also of the roughly similar later date. When listed in 1982 roof was mainly of stone slates but these now replaced with composite tiles.


Farmhouse with attached byre and stable. Of whitewashed stone rubble with composite tile roof; corniced rubble end and ridge stacks with yellow brick capping courses. 2 storeys. Elevation facing road has a small 12-pane casement window under eaves, another masked; hood extends over two 6-pane ground floor casements. Attached byre range has 3 doorways under wooden lintels, to right the cross passage, centre the byre and end left the stable, with signs of masonry alteration between the two latter. Garden facing elevation of original unit has small 6-pane casement under eaves, 2 altered ground floor openings, one with hood, and at right angles the 2-storey wing of c 1900.


Interior of old part of house is much remodelled with roof raised in late C19 but retains spiral stairs to right of fireplace; cross passage backing onto chimney wall adjoins byre with loft, still in use as cowshed with mangers for tethered cows. Attached stable - straight joint with byre - has brick floor; formerly used for shire houses and chaff house, the chaff cutting machinery formerly worked by horse in adjacent yard; wooden stairs to loft which has trusses with collar and tie and 3 rows of trenched purlins.

Reasons for Listing

Listed as a traditional regional farmhouse and byre retaining much of its historic fabric.

Recommended Books

Other nearby listed buildings

  • II Glebe Farm
    On the S flank of Mynyddislwyn, off the E side of the lane leading S to Cwmfelin-fach, and reached by a farm track across fields.
  • II* Church of St Tudor Mynyddislwyn
    On the crest of Mynyddislwyn, surrounded by a walled churchyard.
  • II Lychgate at St Tudor's Church Mynyddislwyn
    On the N side of the churchyard adjacent to the Church Inn, forming the main entrance to the walled churchyard.
  • II Tyle-gwyn
    Very near the SW boundary of the community, S of Gelli-groes and above the hamlet of Wyllie; on the hillside reached by a long track.
  • II Stable range at Tyle-gwyn
    To the rear of Tyle-gwyn, built into the hillside.
  • II Ton-eithin
    Just E of the crest of Mynyddislwyn, SE of the church, on the upper slope of Nant Hafod-Tudur, reached by a long farm track.
  • II Brynysgawen and attached farm range
    On the W hillside of the Sirhowy Valley due W of Ynysddu, reached by the mountain road from Gelli-groes, and along a farm track.
  • II Stable block at Brynysgawen
    On the opposite side of the farmyard to the farmhouse and barn range.

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