In the 1930s he designed parts of the exterior and the interior decoration of Mutual Building, in Cape Town, the then highest building in Africa 91 metres (299 ft) (excluding the Pyramids of Giza). The exterior is equipped with a 120-metre (390 ft) granite frieze and with nine 4-metre-high (13 ft) figures.
Mitford-Barberton designed the stucco reliefs that were placed in the pediments of the neo-baroque public buildings of Tongaat and Maidstone in Kwa-Zulu Natal. These reliefs were an emulation of the eighteenth-century work in the Cape of the noted sculptor Anton Anreith and his colleague, the architect Louis Thibault. Where Anreith and Thibault modelled Palladian figures drawn from classical mythology, Mitford-Barberton designed groupings of plantation workers, and allusions to the Saunders family, founders of the Tongaat Sugar Company. Mitford-Barberton also undertook freestanding sculptures for public spaces and garden features on the Tongaat estate.[8]
From 1947 to 1961, Mitford-Barberton was a member of the Royal Society of British Sculptors, 1957-1961 a Fellow of the Society and a member of the Theosophical Lodge Cape Town.
Mitford-Barberton was a prominent figure in the field of heraldry.[10][11] In 1947, the Cape Provincial Administration commissioned him to prepare a display of municipal coats of arms for the visit of King George VI. Shortly afterwards, the administration asked municipalities to have their arms checked, and if necessary, re-designed, by Mitford-Barberton, to improve heraldic quality.[12] As a result, he designed dozens of municipal coats of arms, some of them in collaboration with H. Ellis Tomlinson (in England). In 1956, he addressed the Institute of Town Clerks of Southern Africa on the subject.[13]
Ivan Mitford-Barberton wrote several books on the history of his family and the 1820 Settlers. He was married twice and had five children, three sons and two daughters.
^"Ivan Mitford-Barberton", Mapping the Practice and Profession of Sculpture in Britain and Ireland 1851-1951, University of Glasgow History of Art and HATII, 2011, archived from the original on 6 October 2014, retrieved 3 October 2014
Merrington, Peter (December 2006). "Cape Dutch Tongaat: A Case Study in 'Heritage'". Journal of Southern African Studies. 32 (4, Heritage in Southern Africa). Taylor & Francis: 683–699. doi:10.1080/03057070600995426. JSTOR25065145. S2CID144785763. – via Jstor(subscription required)
Hilton-Barber, David (2014). The Saint, the Surgeon and the Unsung Botanist: A tribute to my remarkable ancestors. Footprints Press. ISBN978-0-620-61401-6.