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Cof Cymru: National Historic Assets of Wales · Wales

Engine house

Waunfawr, Gwynedd, Wales

A Grade II listed building in Garreg Fawr Slate Quarry, Caernarfon, Waunfawr, Gwynedd, designated on 21 July 1999.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Engine house, Waunfawr, 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
Industrial
Date of designation
21 July 1999
Locality
Garreg Fawr Slate Quarry
Town
Caernarfon
Community
Waunfawr
Unitary authority
Gwynedd
Country
Wales
Coordinates
53.10008, -4.18521
Cadw reference
22049

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 1896 map "Sheet 7. Ordnance Survey of England and Wales." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1896 · Sheet 7. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 106 Bangor (Outline) (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 106 Bangor (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
  • 1919 · Sheet 41. Anglesey. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

Situated in the middle of the former Garreg Fawr Slate Quarry at the head of a steep incline, much of which is submerged under slate waste.

The Garreg Fawr slate quarry opened in 1802 when it was leased by John Evans and his partners to a group of yeomen and quarrymen. In 1882 it was worked by the Betws Garmon Slate Company with an annual output of about 80 tons and 6 men employed; it closed c1900. The engine house appears to be an early feature of the quarry.

Square-plan structure built in the form of a castellated tower. Roughly coursed slate slab construction, formerly with gabled roof concealed by crenellated parapet but roof structure now gone. Entrance on north side through square-headed doorway with round-headed opening directly above. Twin round-headed arches to ground stage on east and west sides (latter now blocked) formerly housed shafts for winding gear. Round-headed openings to upper level on east and south sides (infilled to latter) and twin round-headed openings (also blocked) to upper level on west.

Roofless but wall sockets for joists to former first floor survive, along with extensive lime render below the former gable line. South wall has round-headed fireplace to first floor and another fireplace to ground floor with massive slate lintel.

Included as a well-preseved engine house at the Garreg Fawr Slate Quarry, its picturesque castellated tower form also making it an unusual and distinctive feature in the landscape.

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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