Most ringforts, the circular farmstead enclosures that dot the Irish countryside in their thousands and date broadly to the early medieval period, rely on a single construction method throughout, whether earthen bank or stone wall. The rath at Bawnfune uses both. Roughly half its perimeter is formed by an earthen bank, running from the west-northwest around to the southeast, while the southern and western arc switches to a stone wall of similar height but with its own distinct profile.

The enclosure covers a circular area of roughly 33.5 metres east to west, set into a west-northwest-facing slope in what is now pasture. The earthen bank and the stone wall both reach a height of around 1.3 metres, giving the circuit a broadly consistent presence despite the change in materials. The stone wall is recorded at 1.5 metres wide, substantial enough to suggest it was built to last. To the east, a shallow external fosse, essentially a ditch cut into the ground outside the enclosure, survives to a depth of around 0.3 metres. Fosses like this were a standard feature of earthwork ringforts, serving both as a source of material for the bank and as a modest barrier, though they rarely ran the full circuit. That this one appears only on the eastern side may reflect the natural lie of the land on the slope, or simply the limits of what has survived in recognisable form.