These are the kinds of traces that rarely survive long enough to be noticed, and in this case they only came to light because someone was paying close attention during construction work, not excavating specifically to find them.

In 1997, archaeological monitoring was carried out during the excavation of pile-cap pits at the Castle Street address, the sort of precautionary observation that accompanies development work in areas of known historical sensitivity. What emerged was the outline of medieval buildings constructed using post-and-wattle technique, a method in which upright wooden posts are woven with flexible branches or rods to form walls, typically then plastered with clay or daub. The buildings appear to have stood not flush with the street but set back from it, perhaps connected by narrow pathways. The archaeologist Ann Hayden, reporting in 1998, placed the occupation broadly between the 10th and 12th centuries. Among the finds recovered were a single sherd from a Wiltshire jug dating to the 12th century, iron points, a knife, an arrowhead, bronze pins, bone pins and sewing needles, a composite comb made from antler, fragments of wooden stave-built vessels, leather shoes, and whetstones used for sharpening blades. The Wiltshire jug fragment is a small but pointed detail, a piece of English pottery in a Dublin household, suggesting trade connections across the Irish Sea were already routine.

There is nothing to see at street level today, and Castle Street itself is a busy thoroughfare running west from Dublin Castle toward Christchurch. The archaeological evidence exists only in the record. For anyone interested in early Dublin, the value here lies less in visiting a specific spot and more in understanding that the familiar urban surface conceals layered occupation going back over a thousand years, occasionally glimpsed when a builder's machine cuts deep enough and an archaeologist happens to be watching.