The Port Pirie Post Office, constructed in 1880 and expanded in 1905, reflects the prosperity and consolidation of the town in this period, as it evolved into an important port serving an agricultural region in South Australia. The post office also retained an important role in the town after it experienced further expansion in the twentieth century, in line with the town's association with the
BHP lead smelter, established in 1889 and by the mid-1930s the largest single-unit lead-smelting works in the world. By the 1950s,
Port Pirie had attained the status of South Australia's first provincial city. The post office, as one of an important group of commercial and public buildings in Port Pirie, helps demonstrate the economic development of the region. Typologically, Port Pirie is a relatively externally intact example (intact to its 1905 form) of a second generation post office designed to service a large regional centre. It also contains elements of Port Pirie's first permanent post office at the rear. Major alterations early in the building's history reflect the significantly increased volume and status of the place, and enhanced the primary concept of public frontal components with duality relating to post and telegraphic functions. Although altered, the original recessed porches are evident and the internal planning still demonstrates programmatic requirements and the inclusion of a first floor residential component. Stylistically, the post office is an accomplished and bold example of Edwardian Baroque Revival architecture, the first applied to post office design in South Australia, and subsequently favoured by Government architect,
Charles Edward Owen Smyth. Important characteristics include the large scale, strong civic presence and monumentality, and relationship with other important civic buildings and nearby administrative functions including rail transport. Port Pirie Post Office is a prominent building in an historic streetscape which in turn contains a collection of robust civic buildings, including the adjoining and exuberant former railway station with which the post office has an important visual relationship. More generally, the post office maintains its expressive qualities and a harmonious relationship with its surroundings. The 1905 form and appearance) is a highly accomplished example of the Edwardian Baroque Revival and the first thoroughgoing, grand manner, modern Baroque Revival post office in South Australia. The building also has social value as a prominent public building in an important historic streetscape and the main commercial and civic precinct of Port Pirie, which has had an enduring association with the Port Pirie community for over 120 years through the provision of postal and telecommunication services. The significant components of Port Pirie Post Office include the main postal building comprising fabric dating from 1880 through 1905, with the main façade to Ellen Street dating from the latter works. ==History==