Rather than demolish the existing house, Lanyon built around it, adding a single-storey south bow wing, housing the Library and the Drawing Room and a two-storey north bow wing to accommodate the Garden Room and the Round Bedroom above. He also added a new second floor, which provided accommodation for the children and a School Room. Lanyon then returned to add the magnificent domed Conservatory which Andrew’s son, John Mulholland, later the 1st Baron Dunleath, linked to the house with the Billiard Room. The house continued to be used to the full until the start of the Second World War, after which, like so many houses in the British Isles, it fell into a managed decline, with a lack of money to maintain it and ever fewer staff to serve it. The house was undoubtedly saved when Sir John Betjeman visited in 1961, when he extolled the quality of this Victorian Italian-style Palazzo improbably located in the Irish countryside.