The architectural firm of Armson Collins was formed in 1870 when William Armson arrived in Christchurch. The firm went on to practice under a great many names, as partners came and went. It is unique however in that the firm existed for over 120 years, and was home to four generations of architects from the Collins family.
- 1862 William Armson begins practice in Dunedin
- 1870 Armson establishes the firm in Christchurch
- 1871 John James Collins joins the firm as an articled pupil
- 1879 Armson designs the Boys' High School for Canterbury College
- 1881 The success of the firm means they now have a staff of 13
- 1883 William Armson dies
- 1883 The firm operates as Armson, Collins and Lloyd
- 1887 Richard Dacre Harman joins the firm
- 1903 John Goddard Collins joins the firm
- 1916 The firm operates as Armson, Collins, Harman and Munnings
- 1921 J.J. Collins retires
- 1927 R.D. Harman dies
- 1928 The firm probably becomes Collins and Son at this time
- 1936 John Kempthorne Collins joins the firm
- 1955 J.G. Collins retires
- 1957 Collins and Son design new School of Art on Ilam Campus
- 1960 Richard John Kempthorne Collins joins the firm
- 1965 The firm completes changes to Registry on College town site
- 1993 The firm closes after 123 years
- 1994 The Armson Collins Collection is donated to ҕl