No ruins have been identified, no millrace traced, no surviving stonework attributed to it. What remains is a single line in a medieval administrative document, enough to confirm the mill existed but not enough to say precisely where.

The source is an extent from 1326, a type of formal survey used in medieval Ireland to record the assets and value of a landholding, often compiled when an estate changed hands or came under crown oversight. The Shankill entry, noted by scholar T.E. McNeill in 1950, lists a watermill among the recorded features of the area. Watermills of this period were typically built to serve manorial estates, grinding grain for the lord and his tenants, and they required a reliable stream and a degree of engineering effort to construct and maintain. Their presence in an extent was a mark of economic infrastructure worth recording. Beyond that single reference, however, the Shankill mill leaves no further documentary trail.

The absence of a precise location means there is no site to visit in any conventional sense. The streams in the Shankill area, including those flowing through the Glen of the Downs hinterland and towards the coast, remain the most plausible general area to consider, but no fieldwork has confirmed a specific spot. For those interested in the medieval landscape of south County Dublin, the mill is less a destination than a provocation, a reminder that the documented past and the physical landscape do not always line up. Researchers following up on the McNeill reference should consult the original extent material alongside later mapping of watercourses in the townland, though the work of pinning down this particular site remains, as of the most recent revision of the record in 2018, unfinished.