It is a carding mill, a type of industrial building associated with the processing of raw wool or fibres before spinning, combing and straightening the material into workable form. The ruin is modest: three bays, two storeys, the kind of structure that would have been unremarkable in its working life but is now rare enough to warrant attention.

The mill's most legible surviving feature is the wheel pit along the south-west gable, measuring two metres in width. This is the chamber that once housed the waterwheel, the mechanism that converted the flow of the Owngar into mechanical power for the carding machinery inside. Water was directed to the wheel not from the river directly but via a mill race, a purpose-cut channel drawn from the river to the east, channelling and controlling the flow. Nearby stood a tuck mill, a separate structure associated with the finishing of woven cloth, where fabric was pounded to thicken and clean it. The proximity of the two mills suggests this stretch of the Owngar once supported a small cluster of textile processing, making use of a reliable water source in a period when rural industries of this kind were woven into the local economy across Munster.