By Darian Macey, April 17 2026
The new 2026 Integrated Investment Program is more than just a bigger capability plan. It is a clearer statement that Defence now sees bases, precincts, logistics networks, fuel systems, ICT, storage, health support and industrial infrastructure as part of the warfighting system itself. For the defence estate community, that is the real shift. The 2024 IIP set the direction. The 2026 IIP says much more clearly what parts of the estate, logistics network and industrial base will be used to deliver it.
From reset document to delivery document
The 2024 IIP was largely a reset document. It rebuilt Defence’s investment program around the National Defence Strategy and established the broad priority structure that has shaped the market since. It signalled the importance of northern bases, shipbuilding, long-range strike, logistics, guided weapons and enabling infrastructure, but much of the language still sat at the level of intent. The Defence Estate Audit response was still pending, and further detail on shipbuilding was still to come in later plans.
The 2026 IIP is more pointed. It says Australia has entered a “more dangerous and unpredictable era”, that geopolitical risk has intensified, and that exposure to force projection and military coercion will reach levels “not seen since the Second World War.” It also says Government has “further increased the level of investment in defence capability over the decade” and undertaken “further reprioritisation” including decisions to “cancel, divest, delay or re-scope” lower-priority activities. That is much stronger language than in 2024.
One small but telling change is that “Theatre Logistics” in the 2024 IIP becomes “Theatre Logistics and Health” in the 2026 version. That is not just a wording change. It shows Defence treating preparedness, sustainment and health support more directly as operational capability.
The estate signal is much stronger
The biggest change for the defence estate community sits in the enabling chapters.
In the 2024 IIP, enterprise infrastructure was funded at $17-$22 billion over the decade. In the 2026 IIP, that rises to $30-$40 billion. Enterprise data and ICT rises from $8.5-$11 billion to $12-$15 billion. That is a major uplift, and it is hard to argue this is peripheral when the numbers move that much.
The 2026 document is also much more direct in how it describes this spending. It says, “The Government is investing $30-$40 billion over the decade in infrastructure across key Defence facilities.” It ties that work to “force generation, sustainment, health networks and logistics”, while also linking enterprise data and ICT to secure networks, cloud systems, data management and Defence’s ability to operate “seamlessly and effectively in competition, crisis and conflict.”
That matters because many still read Defence infrastructure too narrowly. The 2026 IIP points to a broader estate workload: logistics centres, fuel systems, secure storage, resilient utilities, training infrastructure, workforce accommodation, health support, command nodes, explosive ordnance facilities, data systems and precinct-scale industrial infrastructure. The defence estate community should not read this as a traditional capital works pipeline with a few military projects attached. It is a more integrated enabling market than that.
The Defence Estate Audit has moved from review to action
The treatment of the estate audit is one of the clearest points of difference between the two documents.
In the 2024 IIP, Defence said the audit made recommendations for re-orienting the estate and that Government would finalise its response later in 2024. In the 2026 IIP, the language is much firmer. Defence says Government has “agreed or agreed-in-principle to all 20” recommendations and that this includes “fully or partially divesting 67 Defence sites across Australia”. It says the objective is to ensure the estate is “modern, future-focused and fit-for-purpose.”
That is a significant shift. It means the estate story is not one of blanket uplift. It is one of selective concentration. Some sites will be enhanced, hardened or expanded. Others will be consolidated or divested. The defence estate community should be careful not to confuse higher total infrastructure spending with evenly spread opportunity across the whole estate.
Henderson and Osborne are now much more concrete
The strongest examples of that concentration are Henderson and Osborne.
The 2024 IIP already made clear that Osborne would be central to Hunter, Hobart replacement and SSN-AUKUS, and that Henderson consolidation would create the conditions for future shipbuilding in Western Australia. But the language was still transitional. Henderson would “set the conditions” for future work, and more detail would come later.
The 2026 IIP is far more explicit. It calls the Henderson Defence Precinct “a national strategic asset” and describes the additional $12 billion announced in 2025 as a “significant down payment”, with planning advice indicating “approximately $25 billion of investment over the decade.” It says this precinct will underpin construction of Army landing craft, the domestic build element of the future general purpose frigates, future Large Optionally Crewed Surface Vessels, Collins sustainment, contingency docking for future nuclear-powered submarines and depot-level maintenance.
Osborne has also shifted from being a strategic idea to a much more defined infrastructure program. The 2026 IIP says Government has approved more than $3.9 billion for infrastructure at the new Osborne Submarine Construction Yard, within a broader projected $30 billion investment over coming decades. It says the yard will make Osborne “one of the most advanced technology hubs in the world” and “the only nuclear-powered submarine construction yard in the southern hemisphere.”
That is why Henderson and Osborne should be read as precinct programs, not just ship programs. They carry estate, utilities, logistics, workforce, access, security and industrial-support implications that go well beyond a single platform acquisition.
Northern bases remain central, even if the accounting looks different
At first glance, the northern bases chapter looks slightly smaller in the 2026 IIP than in the 2024 version. The 2024 total was $14-$18 billion. The 2026 total is $13-$16 billion. A superficial reading might suggest the north has slipped. That is probably the wrong conclusion.
In the 2024 IIP, the northern bases table included a specific “northern logistics network” line. In the 2026 IIP that separate line disappears, but Defence says northern base infrastructure will be “complemented by enhancements to the northern logistics network” and by improved pre-positioning, supply and distribution resilience. In other words, more of the northern story is now being spread across logistics, fuel, ordnance and broader enabling lines rather than being contained neatly in one chapter.
The named northern projects remain substantial: Cocos (Keeling) Islands, Tindal, Darwin, Learmonth, Townsville, Larrakeyah, Bradshaw and infrastructure to support Army’s littoral manoeuvre capability. The document also states plainly that continued investment in northern Australia remains “a key focus” of the 2026 National Defence Strategy.
So the better reading is that northern Australia remains central, but the program logic has become more integrated.
Missile defence, GWEO and logistics now land harder on the estate
The 2024 IIP treated missile defence largely as an architecture being established. It emphasised the joint air battle management system and said some active systems would be considered as technology matured. The 2026 IIP is more mature and more definite.
Missile defence rises from $14-$18 billion in the 2024 IIP to $21-$30 billion in the 2026 IIP. The active missile defence line rises from $1.4-$1.9 billion to $7.2-$10 billion. The document also refers to “new investment in a medium-range, ground-based air defence system” and to work on sovereign hypersonic missile defence technologies.
For the defence estate community, this should not be read as just a weapons story. It implies more demand for radar-related infrastructure, shelters, hardened nodes, protected communications, munitions support, power resilience and passive protection measures across operational sites.
The same pattern appears in guided weapons and explosive ordnance. GWEO rises from $16-$21 billion in the 2024 IIP to $26-$36 billion in the 2026 IIP. The 2026 document is also much more concrete about place and industrial effect: Kongsberg missile manufacture near Newcastle, GMLRS production at Port Wakefield, sovereign rocket motor capability, large-calibre ammunition production, and explosive ordnance redevelopment at Orchard Hills.
Again, this is not only a manufacturing story. It is a story about secure industrial facilities, storage, distribution, servicing, compliance and estate readiness.
Logistics and fuel resilience have also become more explicit. The 2026 IIP says Defence has already doubled its fuel stockholdings since 2022 and will continue investing in storage, distribution, alternative fuels and resilience through the Defence Fuel Resilience Program. That has obvious implications for bulk fuel infrastructure, network resilience and support works across the estate.
What the defence estate community should take from this
The 2026 IIP should be read as a stronger statement that the estate is now embedded more deeply in Defence’s operational design.
The first implication is that the opportunity set is broader than many firms still assume. Defence is not just buying platforms. It is building the physical and digital systems needed to generate, support, protect and sustain them.
The second is that the work is likely to be more concentrated. The document points to priority precincts, operational nodes and industrial sites, not a uniform lift across the whole estate.
The third is that the market is becoming more demanding. The 2026 IIP repeatedly links investment to self-reliance, resilience, stockpiles, sovereign industrial capacity and delivery discipline. Defence is not merely asking industry to design and construct assets. It is asking the broader defence estate community to help create a system that can absorb disruption and sustain force generation over time.
That is the real difference between the 2024 and 2026 IIPs.
The 2024 IIP told the market where Defence wanted to go. The 2026 IIP says much more clearly what parts of the estate, logistics network and industrial base will be used to get it there.
Author: Darian Macey
Darian is a former Engineering Officer with the RAE with tertiary qualifications in Engineering and Project Management. He is a leading practitioner within Australia's NSI sector with previous employment in Government, project management and building contractor organisations.
