Dreadnought Class Submarine Programme (Vanguard Class Successor)
Barrow-in-Furness, UK (construction) · 2016 (construction started) - 2030s (first boat expected in service) · £31 billion (estimated programme cost), with a £10 billion contingency fund.
The judgement call
Account-gated at launchThe Dreadnought class is the future replacement for the Vanguard class, designed to maintain the UK's Continuous At-Sea Deterrent (CASD). - The programme is one of the most complex engineering projects in the UK, requiring significant investment and long-term planning. - Collaboration with the US on the Trident II D5 Life Extension programme ensures the missile system remains viable for the Dreadnought class.
Key engineering challenges
Designing and constructing a new class of highly complex nuclear-powered ballistic missile submarines. - Integrating the Trident II D5 missile system and its associated launch infrastructure. - Ensuring extreme stealth capabilities and survivability for continuous at-sea deterrence. - Managing the immense scale and technical challenges of building the largest submarines in Royal Navy history.
Project facts
- Client / owner
- Royal Navy / UK Ministry of Defence
- Lead contractor
- BAE Systems Submarines
- Lead designers
- BAE Systems Submarines
- Project type
- new build
- Scale
- Four new SSBNs; will be the largest and most powerful submarines ever operated by the Royal Navy; each will carry Trident II D5 ballistic missiles.
- Disciplines
- Naval architecture; nuclear engineering; mechanical engineering; electrical engineering; systems integration; stealth technology
- Standards & frameworks
- Naval nuclear safety standards; UK defence procurement standards.
Sources: Wikipedia: Dreadnought-class submarine (https://en.wikipedia.org/wiki/Dreadnought-class_submarine) - Parliament.uk: Replacing the UK's Nuclear Deterrent: Progress of the Dreadnought... (https://commonslibrary.parliament.uk/research-briefings/cbp-8010/) - BAE Systems: Dreadnought (https://www.baesystems.com/en/product/dreadnought) - 19FortyFive: New U.S. Columbia-Class and UK Dreadnought Submarines Share... (https://www.19fortyfive.com/2026/03/new-u-s-columbia-class-and-uk-dreadnought-submarines-share-the-same-world-war-iii-nuclear-missiles/)