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Mill Forge

A Grade II Listed Building in Gelligaer, Caerphilly

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Latitude: 51.6291 / 51°37'44"N

Longitude: -3.2356 / 3°14'8"W

OS Eastings: 314573

OS Northings: 192977

OS Grid: ST145929

Mapcode National: GBR HV.8JWD

Mapcode Global: VH6DL.V9VZ

Entry Name: Mill Forge

Listing Date: 18 July 2001

Last Amended: 18 July 2001

Grade: II

Source: Cadw

Source ID: 25530

Building Class: Commercial

Location: On the southern border of Ystrad Mynach, on the W bank of Rhymney River, fronting the thoroughfare.

County: Caerphilly

Community: Gelligaer

Community: Gelligaer

Locality: Ystrad Mynach

Traditional County: Glamorgan

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Mill and forge are situated on the border of Ystrad and Llanbradach and historically take the name of each at different times. Does not appear on C18 Llanbradach Estate demesne maps because although owned by Thomas family it was leased out. Probable reference to it as 'old smithy' in Land Tax of 1798. Apppears on Llanfabon Tithe map 1842 and in census of 1841. At this time masons working on the construction of nearby Ystrad Fawr were living in this group of buildings comprising mill, farm, smithy and cottage. Forge cottage also functioned as a post office for Ystrad by 1871 according to census. Forge previously had a stone tiled roof and incorporated a cowshed; it had cobbles to front and tethering rings in wall. Smithy ceased business by turn of century and re-opened in 1973. Present owner created a new opening in wall opposite hearth and extended workshop to rear.


Forge building is attached to left side of house and shares the same chimney. Built of limewashed stone rubble with corrugated roof incorporating ridge ventilator and surmounted by a weathervane. To right and flush with the house frontage is a cambered headed window with shutter; centre right doorway up 2 steps; wall projects and extends to left. Main entrance is now in gable end, blocked doorway to former cowshed adjacent. House attached to right has been altered and extended; frontage has a 2-window range with central porch to ground floor and flat roof dormers above, all C20; end stacks.


Forge hearth is situated in wall shared with house and has a cambered arch reinforced with iron; round-arched recesses below; chimney breast is stepped and curved to accommodate the bellows which now hang on the rear wall. In the cottage, the fireplace incorporates a bake oven.

Reasons for Listing

Listed as an historic forge; group value with the Mill.

Recommended Books

Other nearby listed buildings

  • II The Old Mill
    Set slightly back from the main thoroughfare and on the opposite side of Nant Llanbradach from the Forge.
  • II Old Fire Station
    Originally situated off Park Road but now resited in grounds of Caerphilly County Borough Council offices at Ystrad Fawr, to W of main house.
  • II War Memorial
    Just off Caerphilly Road in a square to the north of Ysbyty Ystrad Fawr, approx. 50m W of the Old Fire Station (rec no 13569).
  • II Ystrad Mynach South Signal Box
    To the south of Ystrad Mynach station on the west side of the tracks off a rough lane from Twyn Road. Private property.
  • II Llanbradach Fawr
    Situated on the mountainside on the W slope of the Rhymney Valley, SW of Ystrad Mynach, and reached by a long lane from Llanbradach to S.
  • II Barn and stable range at Llanbradach Fawr
    Farmyard is on uphill side of the house and this barn is roughly parallel with the house.
  • II Church of Holy Trinity
    A472 skirts the W side of Ystrad centre; church is set back from the road on a knoll within a very hilly walled churchyard which falls away steeply to W and S, main entry at SE through lychgate.
  • II Taranymwrthwl Farm
    At the N end of the village and set back from the W side of the main road through Llanbradach.

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