He is particularly notable for the design of many distinguished apartment buildings in Darlinghurst and Potts Point in the Eastern Suburbs of Sydney.
[2] As a resident of 59 Elizabeth Bay Road, Elizabeth Bay, Hamilton was the first person to propose a tunnel under Kings Cross almost forty years before the Kings Cross Tunnel opened for traffic in 1975 dealing with the traffic gridlock that had developed in that part of the city.
In the 1930s when writing about the need for slum clearance in the metropolitan area newspapers described Hamilton as a city architect and housing authority.
[4] In 1940 Hamilton claimed that under a plan which he had placed before the military authorities accommodation could be provided for 4000 members of the Second Australian Imperial Force.
Hamilton said that he was prepared to give to the government the patent rights of a hut which he believed was suitable for military purposes.