The symmetry of its five-bay facade, a classically proportioned arrangement common to late seventeenth-century Irish domestic architecture, still suggests the ambitions of whoever commissioned it, even as the building itself falls further into dereliction.

The house was built in 1697 by Thomas Acton, and in its original form it would have represented the kind of restrained, solid construction typical of the period, when landed families across Ireland were consolidating estates and building in a manner that signalled permanence and respectability. It stood largely as Acton left it for a century and a half before additional wings were added in 1848, a common pattern in Irish country houses where later generations expanded rather than rebuilt. That mid-nineteenth-century intervention reflects the broader confidence of the Victorian period, when many older Irish houses were enlarged, remodelled, or given new fashionable fronts. At Westaston, the result was a building that carried two distinct architectural moments within a single structure. Most of its interior features have since been removed, leaving the shell without the joinery, plasterwork, and fittings that would have told a more complete story of how the house changed across those two centuries.