The two-storey house that visitors see today incorporates a late 17th-century core, built by Sir William Domville around the 1680s. This older section, which now forms the rear portion of the building, was itself constructed on historically significant ground; it replaced a medieval castle that had commanded this spot for centuries before.

The site's strategic importance becomes clear when you consider its location in what is now a low-lying urbanised area of south County Dublin, with woodland still visible to the west. The progression from medieval fortification to gentleman's residence reflects the broader transformation of Ireland during the 17th and 18th centuries, as the country shifted from a landscape of defensive structures to one of domestic architecture designed for comfort and display.

While much of the medieval castle has been lost to time, the Georgian house serves as a tangible link to multiple periods of Irish history. The building exemplifies how Ireland's historic houses often contain earlier structures within their walls, each generation of owners adapting and expanding upon what came before rather than starting afresh. Today, Loughlinstown House remains a testament to the continuity of occupation at this site, from its medieval origins through to its Georgian refinement.