There is a particular kind of architecture that exists not to be seen but to be known—buildings whose purpose is so sensitive that their walls, their layouts, even their existence are treated as matters of national security. A stone’s throw from Parliament House in Canberra, six giant cranes are working on just such a project: the National Security Office Precinct, the biggest Commonwealth construction project in the capital in almost forty years .
The precinct, located in Barton on the site of a former car park, will house up to 5,000 workers from agencies including the Office of National Intelligence and the Department of Foreign Affairs and Trade . Finance Minister Katy Gallagher has described it as a “building of national significance,” purpose-built to allow the national intelligence community “to do the work they need to do in a changing world.” Several government agencies have reached or are at capacity in their existing buildings, which Gallagher said are not fully fit for purpose and do not provide capacity for future growth .
The cost of the project has not been fully disclosed, cited as “commercial-in-confidence and national security sensitivities.” But the government has confirmed it will cost at least $1 billion. Gallagher has said it will have a “b” in front of it but has declined to confirm the size. The final cost is expected to be revealed publicly only after construction is completed .
Construction began in late 2024 on the site of a former car park, and the project is expected to support more than 10,000 jobs over the build period. Due to the security requirements of the project, it was exempt from needing the green light of the public works committee, which normally scrutinizes major public capital expenditure. No artist impressions or plans have been released, meaning the public will not know exactly what the precinct will look like until it is finished .
The precinct is expected to be completed by the end of 2028, with occupation beginning in 2029 . Alongside the main office buildings, there will be hospitality and retail venues servicing both the wider public and workers in the precinct . A multi-level car park with over 1,000 spaces was constructed adjacent to the John Gorton Building as an enabling project, opening in February 2025, and a childcare centre is planned .
Once agencies move into the new precinct, their former buildings will face uncertain futures. The RG Casey building, currently DFAT’s head office, will be vacated, with its lease due to expire in 2031. As a privately owned commercial property, its future use will be a commercial decision for the landlord .
The precinct represents a significant investment in Australia’s national security infrastructure, one that the government has framed as necessary for a changing world. But for a project of this scale, funded by public money and built on public land, the secrecy surrounding its details raises questions about how the balance between security and transparency is being struck. The final cost, the final design, and the final accounting will all be revealed—eventually.
AI Image Disclaimer: The visuals accompanying this article were created using artificial intelligence and are intended for illustrative purposes only, not as a documentary record of the precinct or its construction.
Sources: Australian Broadcasting Corporation, Traders Union, Department of Finance, The Canberra Times
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