The ten-year Project Royal Oak programme will deliver new docks, waterfront infrastructure, engineering facilities, accommodation and operational buildings at HMNB Clyde, HMNB Devonport and HMNB Portsmouth as part of the Government’s £298bn Defence Investment Plan.
HMNB Clyde accounts for the biggest slice of investment with £15.1bn committed, promising to make Faslane Scotland’s biggest construction site
Project Royal Oak
HMNB Clyde (Faslane) – £15.1bn
This receives the largest share of funding and forms part of the long-running Clyde Transformation Programme.
Key projects include:
- Three new floating docks under Programme Euston for submarine maintenance.
- New shoreside infrastructure supporting the floating docks.
- A new off-site engineering facility to increase submarine maintenance capacity.
- Modernisation of dock infrastructure.
- New training facilities.
- New accommodation for service personnel.
- Long-term asset renewal and infrastructure management across the base.
This investment is aimed at supporting the UK’s nuclear deterrent, Astute-class submarines and future Dreadnought and SSN-AUKUS fleets.
HMNB Devonport – £7.1bn
The Plymouth naval base will undergo a major dockyard renewal focused on submarine support.
Projects include:
- Upgrades to 15 Dock.
- Modernisation of 10 Dock.
- Work to 14 Dock to restart submarine defuelling operations.
- New and replacement infrastructure across the naval base and dockyard.
- Wider estate renewal and maintenance works.
- Devonport remains the UK’s centre for deep submarine maintenance and supports the Continuous At Sea Deterrent, surface ships and the Royal Marines.
HMNB Portsmouth – £3.9bn
The programme will deliver:
- Major renewal of waterfront infrastructure.
- Docking and port infrastructure upgrades.
- Modernisation of operational facilities.
- Estate improvements supporting the surface fleet.
- New and refurbished accommodation.
Across the three bases the MOD will also build new research and development facilities, training centres and out-of-water engineering infrastructure designed to improve fleet availability and support the next generation of Royal Navy vessels.








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