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Offis Fawr (now Woodcraft Centre)

A Grade II Listed Building in Llanddeiniolen, Gwynedd

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Latitude: 53.1213 / 53°7'16"N

Longitude: -4.1143 / 4°6'51"W

OS Eastings: 258609

OS Northings: 360325

OS Grid: SH586603

Mapcode National: GBR 5Q.7923

Mapcode Global: WH54M.ST00

Entry Name: Offis Fawr (now Woodcraft Centre)

Listing Date: 4 November 1999

Last Amended: 4 November 1999

Grade: II

Source: Cadw

Source ID: 22658

Building Class: Industrial

Location: 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

County: Gwynedd

Town: Caernarfon

Community: Llanddeiniolen

Community: Llanddeiniolen

Locality: Gilfach Ddu

Traditional County: Caernarfonshire

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Apparently built contemporaneously with the quarry workshop complex in c1870, the building housed the company offices, the purpose of the verandah abutting the structure on its north and east sides being to offer the quarrymen some protection from the weather as they queued to receive their wages. The building was in use as a timber workshop at time of Survey.


High single-storey double-depth plan of 2 parallel ranges aligned roughly east-west with continuous slate-roofed verandah to north and east sides. Snecked rock-faced rubblestone with tooled granite quoins and other dressings; gable-ended slate roofs with slate coping and fretted bargeboards with carved pendants and finials. East (entrance) elevation has central 4-panel door flanked by 12-paned sashes in quoined surrounds, one to each range, under lean-to verandah supported on cast-iron columns with decorated spandrels. North side has continuation of verandah over three 16-paned sash windows, detailed as on east side; 2 regularly spaced stacks behind ridge have stone bases with octagonal brick shafts and stone capping; verandah has large rooflights as on east side; slate-stone retaining wall in front of verandah has fleur-de-lys pointed iron railings to top. South elevation has four 16-paned sashes, one on left and 3 grouped to right; ridge stack to left is similarly detailed to those on north but with paired shafts.


Interior not accessible at time of Survey but said to be much remodelled; noted as retaining panelled window shutters.

Reasons for Listing

Included as a well-preserved late C19 quarry company office building of distinctive character and appearance, an integral part of the complex of buildings and other structures surviving at the former Dinorwic Slate Quarry.

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Other nearby listed buildings

  • 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
  • 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 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-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 Quarryworkers' Barracks
    Spectacularly and now remotely located off the 'A' Incline of the Dinorwic Slate Quarry just north of the point where it turns abruptly to the north-east; the path between the 2 rows of barracks runs
  • II Hafodty
    Situated in remote wooded position at the end of a driveway leading off the track/road leading down from Dinorwic to Llanberis; driveway has drystone slate slab wall with slab-on-edge coping.
  • II* Former Hospital and boundary walls
    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

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