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Cof Cymru: National Historic Assets of Wales · Wales

SW Roundhouse at Roundhouse Farm

Nantyglo and Blaina, Blaenau Gwent, Wales

A Grade II* listed building in Nantyglo, Nantyglo and Blaina, Blaenau Gwent, designated on 29 June 1950.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of SW Roundhouse at Roundhouse Farm, Nantyglo and Blaina, Blaenau Gwent, 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
Domestic
Date of designation
29 June 1950
Locality
Nantyglo
Community
Nantyglo and Blaina
Unitary authority
Blaenau Gwent
Country
Wales
Coordinates
51.78445, -3.17686
Cadw reference
1863

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 1856 map "42. Brecon." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1856 · 42. Brecon. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 232 Abergavenny (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 232 Abergavenny (Outline) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 14. (David Rumsey Map Collection, Stanford Libraries)
  • 1913 · Sheet 102. Newport. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

Roundhouse Farm is situated on the valley bottom, W of Nantyglo. Farm reached off the end of Waun Ebbw Road. SW tower located some 40 metres away from farmyard.

Built c. 1822 by Joseph Bailey, ironmaster, as one of two fortified stronghouses to protect himself and his family in case of rebellion by the workers at his Nantyglo ironworks. The nearby Nantyglo House, built c. 1820 for Bailey following his purchase of the ironworks in 1811, has long been demolished. There was serious rioting in Nantyglo in 1816 following an attempt to cut wages. In 1822, riots sparked by a cut in wages were suppressed by the military, and a detachment of Scots Greys were billeted nearby. The SW roundhouse is believed to have been used by the Baileys’ private secretary, and local legend states that a tunnel connected it to Nantyglo House. In addition, the towers protected valuable equipment stored in the present barn range, which originally formed part of the Ironworks. The roof, floor-joists, window-sills, frames and fireplaces of the building were all of iron, mainly removed (with the use of explosives) and sold as scrap in the early 1940s.

Circular rubble-built tower with slightly battered base (walls c. 1.2 metres thick). Semi-ruinous, particularly to NW. Two storeys, but formerly rose to a third storey. Narrow rectangular windows, some with iron grilles, sills and lintels. Doorway faces away from farmyard.

Retains cellar and part of stone stair curving around inner wall.

Listed as an historically and architecturally important building, unusual for using iron in its construction and, for the C19, in being fortified.

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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