It is an easy thing to overlook, a single label among the hundreds that Rocque applied to streets, fields, markets, and industries across his celebrated plan. Yet it points to something that has since vanished almost entirely from the urban memory of the area, a working industrial structure at a time when glassmaking was a specialised and carefully regulated trade.

Rocque's 1756 map is one of the most valuable documents surviving from Georgian Dublin, offering a street-level picture of the city at a moment of considerable expansion. A glasshouse, in the eighteenth-century sense, was not a horticultural greenhouse but a furnace-based manufactory where glass was melted and blown or cast, typically for bottles, window panes, or decorative ware. The industry was subject to punishing excise duties under British trade legislation for much of the century, which made any surviving glassworks notable as a marker of either local demand or the particular economic conditions that allowed it to operate. That one appears on the north side of Dublin at this date suggests a working industrial quarter that the later development of the city has long since absorbed and obscured.

The precise location as recorded by Rocque is the sole surviving reference to this structure in the compiled notes. Visitors interested in tracing it are best served by consulting a reproduction of the 1756 map directly, comparing Rocque's street layout against the modern north city grid. Many of Dublin's libraries and digital archives hold accessible copies. The neighbourhood itself bears little visible trace of its eighteenth-century industrial character, but read alongside the map, the ordinary streets take on a different quality, the outline of a working city that predates the familiar Georgian terraces by which Dublin is usually remembered.