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Cwm Clais Mill

A Grade II Listed Building in Port Talbot, Neath Port Talbot

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Latitude: 51.6143 / 51°36'51"N

Longitude: -3.7827 / 3°46'57"W

OS Eastings: 276661

OS Northings: 192114

OS Grid: SS766921

Mapcode National: GBR H3.9K79

Mapcode Global: VH5GV.DP2B

Plus Code: 9C3RJ678+PW

Entry Name: Cwm Clais Mill

Listing Date: 21 March 2000

Last Amended: 21 March 2000

Grade: II

Source: Cadw

Source ID: 23023

Building Class: Agriculture and Subsistence

Location: To the S of the farmhouse and immediately E of stables. The hillside slopes up behind to the S.

County: Neath Port Talbot

Town: Port Talbot

Community: Cwmavon (Cwmafan)

Community: Cwmavon

Locality: Cwm Clais

Traditional County: Glamorgan

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Port Talbot


The wheel is C19 and was made in Carmarthen. It powered a small grist mill until c1950. It was used for cutting up root vegetables for cattle as well as for chaffing corn. The barn itself may pre-date the wheel.


Three-bay rubble stone barn with pan-tile roof. Opposing central doorways and through-passage. The W doorway has a timber lintel with the jambs partially replaced in brick and breeze block. The E doorway appears to have been narrowed and has brick jambs. The walls have been rebuilt in some areas. Large opening to S gable with alterations to surround. Added lean-to against N gable end with slate roof and an opening with brick jambs and a timber lintel.

The stone-lined wheelpit is aligned with the E side of the barn and is offset to the N of the entrance. Cast iron wheel with 6 cast iron struts, wooden paddles and spur gearing. The axle is attached to timber baulks on the wheelpit walls. A small gear on the N side of the spur wheel is attached to the drive shaft which runs into the barn. To the N of the wheelpit is a stone boundary wall which runs off the side of the barn and steps down towards the W. The tail race enters a culvert beneath the wall and has a segmental brick head. The wall returns to the S as a low breeze block enclosure wall. The head race does not survive but a former stone and breeze-block lined culvert survives to the S. A pool of similar materials is to the S of the barn.


The interior has a collar truss roof, some of the timbers replaced. Partial brick-paved floor in through-passage. The walls are partially lined in breeze blocks. Low loft to N end supported on renewed squared timbers. The ground floor to the N steps down and is now concrete. The drive shaft enters the E wall at a low level and is attached to a belt drive wheel. A stable has been formed at the S end with a brick paved floor.

Reasons for Listing

Listed as a rare survival of a small grist mill, a good example of C19 farming practice in this part of Wales.

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