Originally built in the 18th century it was remodelled by architect William Murray in 1842 for the second earl of Charlemont.

Wings were added of one bay and two storeys over a basement, running the full length of the original block; these were in Murray's rather restrained Italianate style.

The original block was given triangular window pediments and similar features so as to match the new wings.

The result was a house in the style of a French château.

[2] In 1864 the third Earl began further remodelling, with some fitting being installed from the family's Dublin home, Charlemont House.