The site carries the designation "cashel" in its recorded name, a term usually reserved for a ringfort defined by a stone wall rather than an earthen bank, yet what was uncovered during pre-development testing in 2004 was a sub-circular ditch, roughly 30 metres in diameter. Its exact position within the landscape is no longer known with certainty, making it one of those archaeological sites that exists more completely in the excavation record than on any map.

The 2004 testing revealed a great deal about how the site functioned in its time. Seven distinct fills within the ditch indicated alternating episodes of silting and slumping, suggesting the enclosure went through cycles of use, neglect, and partial maintenance over an extended period. Ringforts, which were the most common form of rural settlement in early medieval Ireland, typically date from roughly the sixth to the tenth centuries and served as enclosed farmsteads. At the northern entrance, rounded ditch terminals framed a metalled pathway, meaning a surface laid with small stones or gravel to create a firm footing, and three or four substantial post-holes just inside the entrance hint at a gate structure or roofed passageway. Inside the enclosure, excavators found rubbish pits and linear features consistent with everyday domestic activity. The finds recovered were modest but telling: a fragment of a lignite bracelet, lignite being a form of soft coal carved into jewellery during the early medieval period; a copper-alloy stick pin of the kind used to fasten clothing; and a socketed iron object whose precise function is unrecorded. The site record was compiled by Geraldine Stout and uploaded in August 2011.

Because the exact location of the monument is listed as unknown, there is no specific field or townland boundary to direct a visitor toward. Grange sits in an area of south Dublin that has seen considerable development pressure, which is precisely the context that prompted the 2004 testing in the first place. The site is best approached as an archival rather than a physical destination; the excavation report and the national monuments record hold what survives of it. For anyone interested in the density of early medieval settlement across the Dublin hinterland, the Grange cashel is a useful reminder of how much archaeology surfaces briefly during construction groundwork and then recedes, leaving only a paper trace.