It is not the kind of monument that announces itself. What remains is a gallery measuring roughly four metres east to west and just over a metre north to south, along with scattered orthostats, the large upright stones that once formed the walls and court of the original structure, now representing what was the northern portion of an east-facing court.

This is a court tomb, one of Ireland's oldest monument types, built during the Neolithic period, typically between around 4000 and 3500 BC. Court tombs take their name from the open, usually semicircular forecourt that preceded the burial gallery, a space thought to have served some ceremonial function for the community that constructed them. At Aghaderrard, that court is only partially legible now, its northern arc surviving in the displaced stones, while slight traces of the cairn, the mound of stone and earth that would originally have covered the gallery, can still be made out to the north and west. The site was documented by Ruaidhrí de Valera and Seán Ó Nualláin in their 1972 survey of megalithic tombs across Ireland, which remains a foundational reference for understanding the distribution and typology of these structures.