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Former Hospital and boundary walls

A Grade II* Listed Building in Llanddeiniolen, Gwynedd

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Latitude: 53.1247 / 53°7'28"N

Longitude: -4.1187 / 4°7'7"W

OS Eastings: 258327

OS Northings: 360707

OS Grid: SH583607

Mapcode National: GBR 5Q.71ZJ

Mapcode Global: WH54M.PQYF

Entry Name: Former Hospital and boundary walls

Listing Date: 7 February 1989

Last Amended: 4 November 1999

Grade: II*

Source: Cadw

Source ID: 4151

Building Class: Health and Welfare

Location: Situated on level site above the north-east side of Llyn Padarn with spectacular mountain views; lies to north-west of the slate museum from which it is reached by a long drive; also approached over C

County: Gwynedd

Town: Caernarfon

Community: Llanddeiniolen

Community: Llanddeiniolen

Locality: Gilfach Ddu

Traditional County: Caernarfonshire

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Built in 1860 and opened as Dinorwic Slate Quarry Hospital in 1876. This was a hospital for company employees and their families financed by the men’s own contributions; it provided free medical care, a weekly payment during sickness, pension and burial expenses. One of the earliest X-ray units in North Wales operated from here and general surgery continued until 1940s when the hospital became a first-aid centre; the hospital closed in 1962 and reopened in 1978, following restoration to its C19 appearance, as a museum, in which use it remains. The central entrance formerly had a gabled porch.


Plain classical-style 2-storey, 3-bay centre section with flanking single-storey 3-bay wings. Snecked rubblestone with tooled granite quoins, door and window surrounds with keystones and chamfered plinth; slate roofs have deep bracketed eaves, plain bargeboards and integral end stacks with tall octagonal stone shafts, in groups of 4 to main range and single to wings. Main range has cross gable with simple finial and blind attic roundel. Recessed horned 16-paned sash windows and central entrance with panelled half-glazed doors. Slightly set back to either side the single-storey 3-bay ranges also have 16-paned sashes, those to right section unhorned; panelled basement door in gable end of left section. Rear elevations of both side ranges have roundels and sash windows; lean-to at rear of left range with sash windows on right. Cross range on rear of centre range has small-paned sash windows and panelled doors to each side and round-headed windows to its rear gable end. Retaining boundary wall to front forecourt has iron railings with spearhead finials; high revetment wall at rear.


Museum interior displayed and interpreted to public as C19 quarry hospital. Half-glazed inner doors in central hall within a classical pilastered frame. Original twin porcelain basins in operating theatre have brass taps and much of the functional furniture was made in the quarry workshops. Relocated slate fireplace with astrological carving by Thomas Jones is dated 1837. Arched opening off central corridor.

Reasons for Listing

Included at II* as an imposing classically-designed C19 quarry company hospital retaining much of its original character and detailing, an unusual and important building illustrating a significant aspect of the quarry's social structure and history.

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Other nearby listed buildings

  • II Former Mortuary
    Located immediately to the north-west of the former hospital at Dinorwic Slate Quarry on the edge of the levelled site.
  • II Locomotive Shed
    Situated to the north-west of the former Dinorwic Slate Quarry Workshops, immediately alongside the former Padarn Railway (now the Llanberis Lake Railway) between the old quarry hospital and the moder
  • II Incline and Drumhouses
    Incline and drumhouses rising from the old floor (now car park of the Welsh Slate Museum) to the top level of the former Vivian Slate Quarry; massive slate retaining wall located immediately to the no
  • II Locomotive Shed
    Situated to the north-east of the former Dinorwic Slate Quarry Workshops, the locomotive shed is located immediately north of the entrance to the Glan-y-Bala tunnel which once provided a connection to
  • II Offis Fawr (now Woodcraft Centre)
    Located immediately to the east end of the north range of the former Dinorwic Slate Quarry workshop complex, the building is situated high above the workshops on a quarried outcrop; flight of slate st
  • I Dinorwic Slate Quarry Workshops (Welsh Slate Museum Buildings)
    Located at the south-east end of Llyn Padarn to the east of Llanberis, the quarry workshops sit at the foot of the vast workings of the former Dinorwic Slate Quarry; the immediately surrounding land i
  • II Incline, Drumhouses and Counter Balances ('A' Incline)
    Incline rising steeply to the north-east of the former Dinorwic Slate Quarry Workshops, running initially south-eastwards and then just to the south-west of the former quarryworkers' barracks turning
  • II Tanybryn
    Located on eastern side of road leading from Dinorwic to the Dinorwic Slate Quarry; dry slate slab wall to front with vertical slate slabs as piers to decorative iron gates.

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