US Navy shipyard modernization expands from $21B plan to more than $200B

The US Navy's long-term effort to rebuild and modernize its four public shipyards is now projected to cost more than $200 billion and could extend beyond 2080, according to a recent Government Accountability Office assessment. When the Shipyard Infrastructure Optimization Program was launched in 2018, the Navy presented an initial estimate of at least $21 billion over roughly 20 years. The programme has since grown into a multi-generational infrastructure effort involving dry docks, utilities, roads, production facilities, environmental works and major supporting infrastructure.

The increase is not simply a like-for-like cost overrun. The original estimate was preliminary and did not fully account for several major elements, including utility networks, transportation infrastructure, escalation, programme management and the complexity of maintaining active shipyard operations throughout construction. As design work progressed, additional requirements were identified, project scopes expanded and construction costs increased. The $200 billion figure is expressed in then-year dollars and is not yet a validated Navy cost estimate; the Navy is still finalizing a full programme cost and schedule baseline, but current planning already points to more than five decades of work.

More than 400 facility projects are now planned across Portsmouth Naval Shipyard in Maine, Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility in Hawaii, Puget Sound Naval Shipyard and Intermediate Maintenance Facility in Washington, and Norfolk Naval Shipyard in Virginia. More than 60 projects have been completed since 2018, and GAO counted 140 projects in total that are complete, under construction or advanced enough in design to enter budget requests over the next two to three fiscal years, worth around $33.45 billion.

Three major dry-dock projects account for some of the largest individual investments in the programme:

• Portsmouth Naval Shipyard: expansion of Dry Dock 1 for Virginia-class submarines, with around $2.46 billion in requested authorization and completion targeted for May 2029.
• Pearl Harbor Naval Shipyard: a new dry dock designed to increase maintenance capacity for Virginia-class submarines, with around $4.47 billion in requested authorization and completion targeted for March 2029.
• Puget Sound Naval Shipyard: a new multi-mission dry dock capable of supporting Virginia-class submarines and Ford-class aircraft carriers, together with the demolition and relocation of an existing dry dock, piers and critical facilities, carrying around $14.76 billion in requested authorization and completion targeted for 2038.

Together, the three dry-dock projects are estimated at approximately $21.7 billion, already exceeding the headline cost originally associated with the entire 2018 modernization programme.

Portsmouth illustrates the logistical difficulty of rebuilding infrastructure inside an operating naval facility. The constrained island site has required massive concrete floor monoliths to be constructed around 200 miles away and transported to the shipyard by barge. Work has been under way since 2021, with construction progressing alongside the continued maintenance of the Navy's submarine fleet.

Experience from Portsmouth and Pearl Harbor is also influencing how later projects are being developed. At Puget Sound, contractors have been engaged earlier to review constructability, staging and logistics before major works begin. That process has led to changes including additional laydown space and a simplified cofferdam approach, while major demolition is planned to create room for construction activities before dry-dock work starts.

Keeping the shipyards operational throughout the programme is one of the defining challenges. Nuclear-powered submarines and aircraft carriers still require maintenance while dry docks, utilities, piers and production buildings are demolished, relocated or rebuilt around them. Temporary access, construction sequencing, operational continuity and workforce safety therefore become as important as the permanent structures themselves.

The timeline creates another unusual problem. Some facilities being planned today may not be constructed for several decades, by which time ship classes, maintenance strategies, workforce practices and industrial technologies may have changed significantly. GAO found that the Navy has not yet established how it will periodically reassess the programme's objectives and resources as construction extends toward 2080, and recommended that it do so rather than treat today's plan as fixed. The Navy concurred.

What began as a 20-year recapitalization programme has effectively evolved into a long-term rebuilding of the Navy's public shipyard infrastructure. The challenge is no longer only how much it will cost, but how to deliver enough new capacity early enough to support an expanding fleet while the yards themselves remain fully operational.