Henderson Boundary Confirmed: Project Moves From Policy To Design

By Darian Macey, August 24 2026

Defence has fixed the site and broad layout for the Henderson Defence Precinct. It is the clearest milestone yet, but still only a planning decision, not a commercial opportunity.

The Australian Marine Complex at Henderson, where Defence has now fixed the boundary for the future Commonwealth precinct. Image: Defence Australia.

The Australian Government has confirmed the selected site and boundary for the Henderson Defence Precinct, including the preferred part of the waterfront for nuclear-powered submarine sustainment. Defence’s updated project page says the program will now enter concept design, supported by further work with the Western Australian Government, local industry and existing precinct users.

In plain English, government has moved from deciding whether and broadly where to build the precinct to defining the area within which designers must make it work. That is a major milestone. A fixed boundary lets planners test security, access, marine works, utilities, transport, environmental approvals, land transfers and construction staging against a real footprint rather than a range of options.

What has actually been decided

Defence’s official boundary map divides the future industrial area into broad functions. Nuclear-powered submarine sustainment is positioned in the central waterfront sector. Shipbuilding and surface-fleet sustainment are placed to the south, while fabrication, support and other facilities sit farther inland.

Reporting by The West Australian says the Commonwealth–State arrangement also preserves separate State-operated common-user facilities for non-defence industry to the north and south. That follows the 2024 Commonwealth–WA cooperation agreement, which committed both governments to protect commercial access, provide replacement State-owned common-user infrastructure and minimise disruption to existing Australian Marine Complex users.

The map is deliberately high level. It does not set the final position, number or configuration of graving docks; settle every land and seabed transfer; approve a final design; or award a main construction contract. Those decisions sit on the other side of concept design, approvals and investment gates.

Why the boundary is a major project milestone

Until now, the precinct was a strategic commitment with a preferred general location but an unresolved physical interface with the State’s working industrial estate. That uncertainty affected almost every downstream task: design criteria, tenant relocation, security zoning, dredging, road and utility corridors, environmental studies and the sequence in which land could be released for construction.

The decision gives the delivery team a common spatial baseline. Bechtel’s master-planning appointment and AECOM’s site-characterisation work can now be tested against a defined precinct, while the separate contingency dry-dock design work can be integrated with a known waterfront zone. It also gives WA agencies and existing operators a clearer basis for relocation and interface planning.

This is therefore a project gate, not a ribbon-cutting moment. It materially reduces planning uncertainty and allows design to mature, but it does not mean the full precinct is shovel-ready.

What Henderson is intended to contain

Defence says the precinct will be delivered in stages and is intended to provide four core capabilities:

• contingency docking for conventionally armed, nuclear-powered submarines;
• submarine maintenance facilities, including graving docks;
• shipbuilding facilities for larger and more complex vessels; and
• a modern surface-fleet sustainment yard.

The Commonwealth has committed an initial $12 billion. The published early independent estimate remains about $25 billion, as set out in the September 2025 Henderson funding announcement. The figure of about $70 billion reported by The West is not an approved government baseline and should be treated as an emerging cost-risk signal, not as a project or contract value.

Henderson is also more than an AUKUS submarine yard. It anchors Western Australia’s continuous naval shipbuilding and sustainment enterprise. Defence has linked the precinct to 18 landing craft medium and eight landing craft heavy, with the first tranche of landing craft heavy vessels to begin at the existing common-user facility before production moves to a permanent site. The broader pipeline also includes surface combatant work under the Strategic Shipbuilding Agreement.

Three linked sites, three different jobs

The strategic logic is easier to understand when Henderson is viewed with HMAS Stirling and Osborne rather than as a standalone megaproject. Defence describes the three locations as complementary parts of the future naval enterprise.

For the 2027 rotational presence, the immediate enabling works are at HMAS Stirling—not at Henderson. Henderson is the longer-term industrial answer for heavy docking, maintenance, shipbuilding and sustainment. Confusing those roles obscures both the schedule and the near-term contracting opportunity.

USS Vermont at HMAS Stirling during a scheduled submarine maintenance period in October 2025. Royal Australian Navy photograph by ABIS Jaxsen Shinners, via Defense Daily.

The immediate commercial link: DEF01 landside facilities at HMAS Stirling

Submarine Rotational Force–West (SRF-West) is planned to begin from as early as 2027, with one United Kingdom and up to four United States conventionally armed, nuclear-powered submarines operating from HMAS Stirling. Defence’s SRF-West infrastructure page and the June 2026 AUKUS update place the base works inside a broader investment of up to $8 billion to expand HMAS Stirling and build the sovereign workforce, security and support systems needed for the rotation.

The referred priority works were described to the Parliamentary Standing Committee on Public Works in 2024 as a $738.1 million capital project, excluding GST. That amount covered the referred priority works only; it was not the value of the full Stirling program and should not be used as the value of any current tender.

The Public Works Committee statement of evidence split DEF01 into two licensed works packages. Package 1 covered maritime works: berth upgrades, services, pontoons and dredging. Package 2 covered the landside operational, maintenance and sustainment facilities. In plain English, the landside scope provides the controlled buildings and engineering services needed to inspect, handle and support nuclear-submarine equipment safely on shore.

Its stated elements included a Radiological Controls Technical Field Office; a Controlled Industrial Facility; a power station and associated services; a pure-water processing plant; and supporting engineering-services upgrades. The Australian Submarine Agency’s construction update describes the Controlled Industrial Facility as the place where nuclear-propulsion components and specialised tools can be serviced, with supporting laboratories, dosimetry and controlled low-level waste functions.

CURRENT PROCUREMENT POSITION
DECNET understands that Defence has issued the DEF01 landside facilities contract as a limited tender to selected contractors on the Defence Infrastructure Panel – Major Construction (DIP-MC). Defence has not publicly disclosed the invited bidders, tender value, close date or final contract terms, so those details should not be inferred from the earlier PWC estimate.

The DIP-MC framework is Defence’s 2025–2030 panel for major construction and capital projects generally valued at $200 million or more. Defence’s panel engagement guidance explains that an agency can run an expression-of-interest process and then invite a limited number of panel contractors to tender under confidentiality. The direct head-contract opportunity is therefore confined to invited panellists; specialist subcontractors and suppliers need to position through those teams rather than wait for a public open tender.

Defence awarded the Duratec Ertech Joint Venture the ECI Head Contract for the Controlled Industrial Facility planning phase under CN4103138. Executed on 11 October 2024, the contract now runs to 30 September 2026. It covers planning, not delivery of the landside facilities. The current limited tender is the follow-on construction procurement; its invited bidders, value and final terms remain undisclosed.

What the boundary decision means for industry

For the market, the announcement improves line of sight but does not yet create one all-encompassing Henderson construction tender. The precinct will be broken into a long sequence of design, enabling, marine, utilities, transport, security, building, commissioning and operational-support packages. The boundary allows those packages to be defined more credibly.

The next signals worth watching are:

• publication of concept-design outcomes and a more precise staging plan;
• land, seabed and common-user-facility transition arrangements with Western Australia;
• environmental, heritage and naval nuclear safety approval pathways;
• the number and configuration of docks and their marine enabling works;
• approved funding tranches and delivery models for individual works packages; and
• interfaces between Henderson, HMAS Stirling and the Osborne submarine enterprise.

Companies targeting the near-term DEF01 opportunity should focus on the invited DIP-MC supply chains and the demands of construction on an operational naval base: security clearances, nuclear-safety culture, quality assurance, configuration control, local and Indigenous participation, and disciplined commissioning. Companies targeting Henderson should prepare for a longer pipeline in which design maturity and packaging will develop progressively from the boundary now announced.

The milestone—and the test that follows

The Henderson boundary announcement is a major milestone because it converts a national policy commitment into a defined place. It removes a central constraint on concept design and provides a workable basis for coordinating Defence, the WA Government, shipbuilders, resources-sector users and the naval nuclear enterprise.

The next test is delivery discipline: translating that boundary into an approved master plan, affordable stages, coordinated relocations, credible approvals and packages that industry can price and build. Henderson has crossed an important line, but the program remains in planning and design. The separate DEF01 landside tender at HMAS Stirling shows what the market transition looks like once scope, delivery route and operational need become sufficiently mature.

Primary references

• Defence — Henderson Defence Precinct project page
• Defence — Henderson precinct aerial boundary map
• Commonwealth and WA Government — 2024 cooperation agreement
• Defence — Submarine Rotational Force–West infrastructure project
• Parliament of Australia — DEF01 Public Works Committee statement of evidence
• Defence — Defence Infrastructure Panel, Major Construction
• The West Australian — boundary agreement report, 23 August 2026

Editorial note: Publicly confirmed facts are attributed to linked government or parliamentary sources. The live DEF01 limited-tender position is identified as DECNET market intelligence because tender particulars are not publicly available.

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.