Japan’s New Drydock Plans Highlight Constraints on U.S.-Japan Naval Cooperation

On August 19, Nikkei Asia reported that Namura Shipbuilding intends to build a new drydock for large vessels by 2035. Japan, already the world’s third‑largest shipbuilder, is expanding amid security concerns about limited U.S. shipbuilding capacity and the potential for allies like Japan to fill the gap.

Yet the announcement reveals a sobering reality: Japanese yards are operating at full capacity, so future alliance cooperation will hinge less on formal agreements and more on securing available schedule space.

The new drydock will be sited in Imari Bay on the northwestern coast of Kyushu in Saga Prefecture, marking Japan’s first large drydock since 2017. Upon completion, it is slated to focus on constructing liquefied natural gas carriers.

The project follows a series of government and industry initiatives aimed at revitalizing shipbuilding. In November 2025, Prime Minister Takaichi Sanae designated 17 nationally important sectors—including shipbuilding—as engines of growth through public‑private investment. The industry has outlined a roadmap to double annual capacity to 18 million gross tons by around 2035, and both government and industry seek to establish a 1 trillion‑yen ($6.5 billion) fund to revive Japanese shipbuilding.

These investments are driven by several factors. Historically, shipbuilding powered Japan’s post‑World War II economic growth and industrialization. Strengthening the sector helps preserve industrial capacity despite decades of eroding market share. Meanwhile, China’s globally dominant shipyards and expanding naval presence contrast sharply with the United States, where naval shipyards suffer from delays and maintenance bottlenecks, and commercial yards remain competitive only domestically, building ships at roughly quadruple the international price.

U.S. vessels already undergo maintenance at American bases in Japan. Discussions at the Defense Industrial Cooperation, Acquisition, and Sustainment forum have explored expanding repair operations for U.S. ships to Japanese yards beyond those bases. Such cooperation would let the United States alleviate its naval maintenance backlog and save up to 17 days of transit time by avoiding trips to Guam or the mainland.

Japanese firms would gain commercially by attracting the U.S. Navy as a customer, while Japan would improve the availability of U.S. naval ships and reduce their time away from operations, thereby bolstering regional deterrence in the Pacific.

The difficulty lies in capacity: Japanese yards lack the spare room needed for such cooperation. Namura’s expansion decision follows sustained high utilization at its existing Imari dock, and Japan’s revitalization roadmap identifies capacity shortfall as the principal obstacle to doubling output. Consequently, scheduling U.S. naval repair work in Japanese yards may be less a matter of interest than of available slots already committed to paying commercial customers.

The new dock will not relieve this pressure; it is not scheduled for completion until 2035, and its output is already earmarked for LNG carrier construction.

Even if schedule space were available, additional hurdles remain. Namura primarily builds bulk carriers and tankers; shifting to naval work requires more than just opening a calendar. Yards need cleared workforces, familiarity with U.S. Navy specifications, and qualification processes that take time to develop. A workforce trained on LNG hulls cannot readily pivot to warship repair.

Labor is another major constraint. One estimate warns of a nationwide shortfall of up to 12,000 shipbuilding‑related workers if the industry achieves its goal of doubling orders.

Japan’s commitment to funding yard expansion does not automatically translate into allied maintenance cooperation. The new capacity will not arrive for another decade, and even then the dock time will likely already be claimed by commercial orders.

If the United States and Japan want Japanese yards to service U.S. ships during a contingency, the arrangement must be secured before the slots fill—not after.

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