Number 121 The Coombe is a Dutch Billy, a building type so thoroughly swept away by later development and neglect that surviving examples in Dublin are now genuinely rare. To encounter one here, on a street that has seen centuries of change, is to come across a form that most Dubliners would struggle to name.

The Dutch Billy was a style of terraced townhouse introduced to Ireland largely through the influence of Huguenot and Dutch settlers who arrived in significant numbers during the late seventeenth century, bringing with them the stepped or curved gable facades familiar from Amsterdam and other northern European cities. The name itself is popularly linked to King William III, William of Orange, though the architectural connection is broader than any single patron. These houses were built with their gable ends facing the street rather than the side elevation, giving them a distinctive profile quite unlike the flat-fronted Georgian terraces that came to dominate Dublin in the following century. The Liberties, the area in which The Coombe sits, was a centre of the Huguenot weaving trade, and the presence of a Dutch Billy here reflects that demographic and commercial history in concrete form. The dating of number 121 remains indeterminate, meaning no precise construction year has been firmly established.

The Coombe runs westward from the junction near St Patrick's Cathedral, and number 121 sits among a streetscape that is mixed and uneven, as is common in this part of the city. The gable profile is the thing to look for; the stepped or shaped parapet rising above the roofline marks it out from its neighbours immediately. The surrounding area rewards slow walking rather than a quick pass, since the Liberties retains fragments of its older urban grain in unexpected places. There is no formal visitor access to the building itself, so the interest is architectural and streetside, best appreciated simply by standing back and considering how much of what once surrounded it has gone.