Prefabrication: Ian McKay and Partners’ Guardian House for Canberra’s NCDC (1968-69)

Canberra as a planned city is often perceived as one with locally specific buildings: however, the conditions of efficiency, labour, and transport were central to erecting a capital under the direction of the National Capital Development Commission (NCDC). This paper reveals how innovations in timber construction from war experience, the NCDC’s shared history with the Snowy Hydro Scheme (1949-74), and publications tracking the construction of the Sydney Opera House (1957-66), forged cultures and agents of timber and masonry prefabrication, in both housing and public buildings, in East Coast Australian post-war architecture.

National and local exchange is inscribed in Guardian House’s materiality - sheathed, triangulated plywood prefabricated trusses sourced from Sydney resulted in the distinct floating canopy roof. Timber serves as both structure and skin, in contrast to surrounding development, with the plywood soffit wrapping from interior to exterior.

This study reveals an alternative historiography to Australian architecture: highlighting transnational and national cultures of prefabrication; as well as post-war structural innovation outside of the Melbourne School. Guardian House is a rare example of highly awarded public building which received heritage listing after its demolition, which is analysed through re-drawing and modelling the project. Unearthing Guardian House reveals these conditions and networks of material cultures and agents involved in this building, and more broadly, the larger NCDC project’s material innovation and locally responsive public architecture.