The house is a south facing multi-bay mansion, originally dating from the 17th Century. It was dramatically altered by the 10th Earl of Meath in the 1820s, who created a large gothic mansion with a massive central hall in which they installed a grand organ. The approach was redirected to a north-facing drive and the road from Dublin to Wicklow was diverted to the other side of the Great Rock. The interiors were richly furnished in the Regency style of the day.

The interior boasts elaborate chimney pieces by Giacinto Micali, crimson silk damask from Spitalfields, stained glass by John Milner, a domed ceiling by Henry Popje and the wonderful drawing room ceiling by Simon Gilligan, who worked for Popje. The clock tower in the forecourt houses a water clock designed and constructed by Normand, the 13th Earl of Meath.