Bridge Mill, Castletownroche, Co. Cork

Six bays wide, with an attic tucked beneath a pitched slate roof and a louvred lantern turning in the wind atop the ridge, it dominates its surroundings in the way that only industrial buildings built with real confidence tend to do. Look at the ground floor and the reason for its bulk becomes clear: a round-arched passage runs straight through the building, cut to accommodate a waterwheel that once turned inside it, fed by a millrace whose square-headed outlet still survives in the west gable.

The mill was built in 1838, at a moment when water power drove much of Ireland's rural industry, and it may well stand on the site of, or incorporate, earlier structures, the coursed rubble and iron tie-plates hinting at a building history longer than a single date can capture. It worked as a flour mill for well over a century, only closing in the 1990s, a late survival for a business already superseded elsewhere by steam and electricity decades before. Rather than fall into dereliction, the mill was bought by the local community and repurposed, a renovation in 2000 converting it into offices while keeping its industrial skeleton intact, the archways with their tooled limestone voussoirs, the chimneystacks, the round iron ties that once held the rubble walls under tension. A single-storey lean-to with its own attic was added to the north elevation, and the whole thing is fronted, on its south side, by a smoother rendered face, as though the building presents one aspect to the passer-by and another, rougher and more honest, to those who look closer.

The grounds along the old millrace have been kept as public space, giving the site a second life as an amenity area rather than a fenced-off relic. Wrought-iron gates, some plain and vehicular, some more decorative and set for pedestrians between limestone piers, mark the boundary of what was once a working mill complex and is now something closer to a park with a very large building at its centre. Approached from the town, it still reads as an introduction of sorts, the scale and material of the place announcing the town's industrial past before any sign or plaque could.