Lt Col. Duncan Campbell, 7th of Inverneill, added the three-storey wing around 1890. The house was occupied by the Campbell family until 1955 when it was sold, though the family continue to own Inverneill Island. The last two occupants were the Misses Olive and Una Campbell. Their sister had married and became Mrs. Ysobel Stewart of Fasnacloich was the founder of the Scottish Country Dance Society and became its first Secretary. A country dance named "Inverneill House" was composed in her honour.
