It is only about nine metres tall, barely remarkable at a glance, yet its door sits at first-floor level with no stairs leading up to it. The original entrance was reached by retractable ladder, a design detail that quietly reveals the structure's purpose: this was not a dwelling or a folly, but a military installation, one link in a chain of coastal watchtowers built by the British Board of Ordnance in the early nineteenth century to watch for a French invasion fleet that never came.

Constructed around 1804 to 1805, the tower at Ballymacredmond was part of a network of over eighty such signal stations that ran in a continuous coastal chain from Dublin Bay clockwise around the entire Irish coastline to Malin Head in County Donegal. Signalling between stations was carried out using a naval signal post, and the system was designed so that an alarm could travel the length of the coast in a matter of hours. The tower itself is a two-storey structure over a partial raised basement, built from roughly coursed rubble stone and originally lime rendered and weather-slated on the exterior. Above its first-floor doorway, a machicolation, a projecting parapet opening through which objects could be dropped on anyone forcing entry below, sits on four tapering stone corbels, a feature more commonly associated with medieval fortifications. Corner bartizans, small turrets projecting from the angles of the parapet, once flanked the rear elevation, though both have now largely collapsed. The tower originally sat within a larger rectangular enclosure with a distinctive rounded south-western end, the position of the signal mast. By the time of the first Ordnance Survey in 1841 to 1842, the tower appeared to have a T-shaped plan, suggesting an additional structure had been built against it; this was gone or collapsed before the second survey of 1897 to 1904. The whole system was abandoned by the mid-1810s, once the Napoleonic threat receded. The nearest surviving counterpart to the east, at the Old Head of Kinsale roughly thirteen kilometres away, was restored around 2018 and now operates as a visitor attraction; the Ballymacredmond tower, by contrast, remains quietly in the fields, its parapet damaged, a ragged hole broken through its north-west wall, sections of original lime render still clinging to the interior.