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Cof Cymru: National Historic Assets of Wales · Wales

H.M.Prison, Main Block (B.Wing)

Castle, Swansea, Wales

A Grade II listed building in Castle, Swansea, designated on 15 April 1985.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of H.M.Prison, Main Block (B.Wing), Castle, Swansea, 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
Civil
Date of designation
15 April 1985
Community
Castle
Unitary authority
Swansea
Country
Wales
Coordinates
51.61506, -3.94954
Cadw reference
11605

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 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1637 · The fourth table of England. Cornub. Devonia, Somerset etc. (David Rumsey Map Collection, Stanford Libraries)
  • 1865 · England and Wales. England No. 6. (David Rumsey Map Collection, Stanford Libraries)
  • 1891 · Sheet 10. Ordnance Survey of England and Wales. . (David Rumsey Map Collection, Stanford Libraries)
  • 1897 · 247 Swansea (Hills) (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

Main L-shaped block for men at centre of prison compound and directly north of the gatehouse.

Dating from 1861 when the entire prison was rebuilt and enlarged (cost over £30,000), some later additions.

Robust Italianate detailing to entrance block. Tall N and W wings with octagonal centre and diagonally-placed entrance block (forming the larger part of star plan). 4 storeys, coursed rubble with freestone dressings to quoins and window surrounds. Corrugated asbestos roofs, with oversailing eaves, massive square stacks with cappings. 8 plus 7 windows facing south to A wing, 3 lowered cills to top floor left, iron grilles to openings with many original cast iron window frames behind. Similar detailing to B wing running north. Tall round arched windows to N and W gable ends. Polygonal centre with brick infill wall on E face (for unbuilt wing?); arched voussoir treatment to advanced centre of S wall, half flying-arch attaches N wing to centre. 2 storey and basement entrance block facing SW. Rubble walls, hipped roof, eaves cornice, slightly advanced frontispiece with round-arched bipartite window with keyblocks to 1st floor, fine cavetto-moulded and rusticated doorpiece and keyblock linked to stringcourse, blind tympanum and lintel over modern double doors, flight of steps orientated south towards gatehouse. Modern extensions flank entrance block with links forward to buildings on left and right.

Interiors are mostly of painted brickwork with open trussed roofs, ironwork stairs, cantilevered landings with latticework handrails, segmental arched heads to internal openings and doorways. Ironwork-cell doors, metal grilles and screens to ends of wings and corridors etc.

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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