That much is certain. Where exactly it stood is not, and therein lies the quiet puzzle at the heart of this entry. The structure has slipped entirely from the physical record, leaving behind only a single line in a seventeenth-century survey to confirm it ever existed at all.

The source is the Civil Survey of Dublin, carried out between 1654 and 1656, a systematic effort by Cromwellian administrators to catalogue land ownership across Ireland, largely as a precursor to redistribution and plantation. The survey recorded that in Garristown, on lands belonging to a Mr Laurence Bealing of Bealingstowne, described as an Irish Papist, there stood one chaffe house, a barne, and a kill house. A chaffe house was used for storing chaff, the husks separated from grain during threshing, while a kill house, or kiln house, was typically used for drying grain. Taken together, the three structures suggest a working agricultural complex, modest but functional. The jury assessed the combined value at ten pounds. Bealing's identity as a Catholic landowner is significant in context; the Civil Survey was conducted at a moment when such proprietors faced the very real prospect of dispossession under Cromwellian land settlement policies.

Because the precise location of the barn has not been identified, there is no site to visit in any conventional sense. Garristown itself is a small village in the north of the county, and the wider townland retains much of its agricultural character. For anyone curious enough to go, the interest lies less in finding something than in the experience of looking at an ordinary field and knowing that a documented but unlocatable piece of early modern rural life once occupied the ground somewhere nearby. The Civil Survey entry was published by Robert C. Simington in 1945, and remains the sole record.