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Cof Cymru: National Historic Assets of Wales · Wales

Arvon and adjoining outbuildings to the north

Llanllyfni, Gwynedd, Wales

A Grade II listed building in Penygroes, Caernarfon, Llanllyfni, Gwynedd, designated on 21 July 2000.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Arvon and adjoining outbuildings to the north, Llanllyfni, Gwynedd, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Commercial
Date of designation
21 July 2000
Locality
Penygroes
Town
Caernarfon
Community
Llanllyfni
Unitary authority
Gwynedd
Country
Wales
Coordinates
53.05324, -4.28104
Cadw reference
23703

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1896 · Sheet 7. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 118 Nevin (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

Situated in a prominent position at the junction of Heol Buddog and Ffordd-y-Sir with gardens in front and the similarly detailed Bod Owen alongside, the highly patterned slate roofs of Arvon and its outbuildings form a distinctive local land-mark.

Built as offices for the former Riley Slate Quarry in early C20. The Riley Slate Company leased a number of smaller quarries in Nantlle and the Rhose quarry near Capel Curig. The remarkable highly decorative slate roofs were no doubt intended to display the quality and variety of slates the Company's quarry had on offer and to give an indication of the way in which they could be employed to best effect. It was converted to domestic use later in C20.

Rendered walls under highly decorated half-hipped slate roof with red ceramic ridge tiles and grey, green and purple slates forming diaper patterning; 2 small rendered ridge stacks. Single storey; simple rectangular plan. Central entrance with glazed door flanked by canted bay windows, all with applied late C20 false leading. Applied timber framing to end walls. The outbuildings, which are also rendered, lower and set back to the rear, have very similar roofs to the main building, save that they are gabled and the higher of the 2 has curved ornamental cresting to the end ridge tiles; early C20 timber casements and boarded doors are probably original.

Interior not inspected at time of Survey.

Forming a group with Bod Owen, which also retains its original form as Company office building, the buildings are an important relic of the slate industry in the town, notable for their virtuoso exploitation of the decorative properties of the material.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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