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Former Isolation Hospital (Main Block) Flat Holm Island

A Grade II Listed Building in Butetown, Cardiff

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Latitude: 51.3777 / 51°22'39"N

Longitude: -3.1223 / 3°7'20"W

OS Eastings: 321986

OS Northings: 164891

OS Grid: ST219648

Mapcode National: GBR J0.SHB7

Mapcode Global: VH6FT.TMRQ

Plus Code: 9C3R9VHH+33

Entry Name: Former Isolation Hospital (Main Block) Flat Holm Island

Listing Date: 6 May 1987

Last Amended: 21 August 1998

Grade: II

Source: Cadw

Source ID: 14093

Building Class: Health and Welfare

Location: Situated on rising ground towards the centre-west of the island; formerly grouped with ancillary buildings in hospital compound.

County: Cardiff

Community: Butetown

Community: Butetown

Locality: Flat Holm Island

Traditional County: Somerset

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1896. Designed by Williams Harpur, Borough Engineer of Cardiff (in accordance with the Local Government Board's model plans of 1895). Cost £2,450. The hospital (in tented form) was first authorised in 1883 to protect Cardiff from ship-bourne cholera; later used by other Bristol Channel ports and for isolation of victims of other epidemic diseases. Out of use 1937, converted to wartime service 1940-4.


Single storey symmetrical block with gabled cross-wing to centre and end porches. Cement render on red brick, slate roofs with plain bargeboards, tiled crestings and three rear stacks (2 at eaves); ridge ventilators removed. Simple 4-window flanks to entrance gable with narrow lights and half-timbered porch; 2-light timber frames with top ventilators largely decayed.

Derelict condition (Autumn 1997).


Interior retains plain-form of two 6-beds with central nursing station. Collar-beam roof construction with angled metal tie-rods.

Reasons for Listing

Historically important as an unaltererd example of a Victorian isolation hospital, uniquely sited on a British Offshore Island.

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