It was founded by William Barnett Armson (1832/3–1883), and after his death became the practice of two architects who articled with him, John James Collins (1855–1933) and Richard Dacre Harman (1859–1927).
Armson, Collins and Harman was one of the two oldest architectural firms in the country.
The Strange and Co's building on the corner of High and Lichfield Streets, in Christchurch was built for a company that was established in 1863.
[7] Others included Christchurch Press Building (1909),[8] Nazareth House (1909), Curator’s House, Botanic Gardens, Rolleston Avenue (1919), the former Canterbury College Students Union (1927), the Nurses Memorial Chapel at Christchurch Public Hospital (1927),[9] and the Sign of the Takahe (1934/36).
[10] The firm's archives, donated to the Macmillan Brown Library, were added to the UNESCO Memory of the World Aotearoa New Zealand Ngā Mahara o te Ao register in 2018.