At Lissenhall Little in north County Dublin, the construction groundwork for the M1 motorway exposed the remains of a Neolithic house that had been sitting undisturbed in the soil for thousands of years, invisible to every generation that farmed or walked that ground above it.

Excavated under licence number 01E1074, the structure measured roughly 9 metres by 5 to 6 metres, making it a substantial dwelling by any era's standards. Archaeologists identified it through a pattern of postholes, none wider than 30 centimetres in diameter, which are the telltale impressions left when upright timber posts rot away and the surrounding soil collapses inward. Post-built construction of this kind is characteristic of Neolithic domestic architecture in Ireland, where timber frames were raised and likely infilled with wattle or other organic materials that leave little behind. A hearth was found enclosed within the south-western corner of the interior, suggesting a practical organisation of living space that would not feel entirely foreign today. Adjacent to the structure, excavators recovered sherds of Western Neolithic pottery, a ceramic tradition associated with early farming communities in Ireland and Britain from roughly 4000 BCE onward. To the north of the building, further features emerged: a possible platform or storage structure, fence lines, and four pits, pointing to a small but organised domestic or agricultural complex rather than an isolated dwelling. The site was one of two Neolithic post-built structures identified in the same excavation, indicating that this was not a solitary homestead but part of a wider pattern of early settlement in the area.

There is nothing to visit at Lissenhall Little in the conventional sense. The excavation was a salvage operation carried out ahead of development, and the features recorded have long since been built over by the motorway corridor. What remains is the archaeological record itself, published in summary by F. Reilly in 2013, and the coordinates held in the national monuments database. For anyone with an interest in Neolithic Ireland more broadly, the National Museum in Dublin holds extensive collections of Western Neolithic pottery and can give material context to what was found here, even if this particular site now lies beneath tarmac and hard shoulders on one of the country's busiest roads.