How to get into UK defence and nuclear work
Most people who already qualify for defence work don't realise it. This guide covers entry routes into submarine build, dockyard refit, air and weapons systems and licensed nuclear sites — which trades transfer directly, what clearance involves and the training employers provide.
Your skills probably already fit
Defence and nuclear programmes need conventional engineering and trades delivered to a higher standard of documentation, traceability and safety — not a different set of skills.
Electrician (domestic, commercial, industrial)
→ Electrical fitter, C&I technician, installation and commissioning
18th Edition plus site experience is usually enough to be considered; nuclear-specific training is provided.
Welder / fabricator
→ Coded welder, plater, pipefitter on submarine and plant work
Coding tests matter more than sector history. TIG and MMA coding opens the most doors.
Mechanical fitter / maintenance engineer
→ Plant maintenance, mechanical handling, outage and decommissioning teams
Shutdown, process plant or heavy industry experience maps almost one-to-one.
Construction site manager / QS / planner
→ Project controls, planning, cost engineering, contracts management
Large-project experience is the transferable asset — NEC contract familiarity helps.
Armed forces leaver (engineering or marine trades)
→ Naval nuclear, commissioning, safety and operations roles
Existing clearance and disciplined procedural working are strongly valued.
Graduate in engineering, physics or chemistry
→ Safety case, radiological protection, design and systems engineering
Graduate schemes recruit annually; placements and summer work help significantly.
Four steps to your first nuclear role
1. Pick the programme that fits you
Barrow for submarine build and manufacturing trades, Sellafield for decommissioning and radiological work, supply chain for fabrication, design and commissioning.
2. Line up the basics
A current CSCS or relevant skills card, your trade certificates or coding, a clean CV listing plant and project experience, and photo ID plus five-year address history for vetting.
3. Apply through employers and technical recruiters
The cluster hires heavily through Tier 1 contractors and specialist agencies. Applying to two or three that hold the relevant frameworks is usually faster than a single direct application.
4. Expect training on entry
Radiological awareness, site induction, safety culture and quality procedures are delivered by the employer. You are not expected to arrive with them.
How to get security clearance — trades and everyone else
Clearance is the step that puts most welders, electricians, pipefitters, fitters, scaffolders and site staff off applying. It shouldn't. Here is exactly what each level means, how long it takes and what you need in hand. The same process applies to engineers, planners, quality staff and graduates — only the level changes.
Baseline Personnel Security Standard
Who needs it: Almost every trade on site — welders, electricians, pipefitters, scaffolders, fitters, labourers, plus office staff.
Typical timescale: Days to about 2 weeks
What you'll be asked for: Photo ID, proof of address, right-to-work, 3-year employment history with gaps explained, and a basic unspent-conviction declaration.
Site security clearance (Sellafield / licensed sites)
Who needs it: Anyone needing unescorted access to a licensed nuclear site, including short-term agency trades.
Typical timescale: 2 – 6 weeks
What you'll be asked for: BPSS plus a site-specific security questionnaire, referees, and in some cases a drug and alcohol screen and medical.
Security Check
Who needs it: Submarine build and refit trades at Barrow, defence fabrication, design offices, and many Tier 1 contract roles.
Typical timescale: 6 – 8 weeks typical, longer with overseas history
What you'll be asked for: 5-year address and employment history, credit and criminal record checks, national security vetting questionnaire (usually via NSVS).
Developed Vetting
Who needs it: A smaller number of roles with sustained access to the most sensitive areas or information.
Typical timescale: 3 – 6 months
What you'll be asked for: 10-year history, financial disclosure, referee interviews and a face-to-face vetting interview.
Getting through it without delays
You don't apply for clearance yourself
Clearance is sponsored by an employer or agency against a specific role. There is no way to buy or pre-apply for SC or DV as an individual — be wary of anyone selling it.
Get your paperwork ready before you apply
Five years of unbroken address and employment history is the single biggest cause of delay. Write it out now with month/year dates, landlords or agencies, and an explanation for any gap, travel or self-employment.
Expect a conditional start
Many trades start on BPSS and site vetting while SC is processed, working escorted or in non-restricted areas. Ask the recruiter what you can work on during the wait.
Clearance travels with you
Once granted, SC or DV can usually be transferred or reactivated by a new sponsor if it has not lapsed (normally within 12 months). Keep your clearance reference and expiry date on your CV.
Things that slow it down, not stop it
Debt, past convictions, dual nationality or family overseas rarely rule you out on their own. Undisclosed information does. Declare everything honestly.
Common questions
Do I need nuclear experience to work at Sellafield or Barrow?
No. A large share of roles are standard engineering and trades work delivered to nuclear standards. Employers expect your core trade or discipline to be sound and will train you on site-specific procedures, radiological awareness and quality requirements.
What security clearance do UK defence jobs need?
Most roles start with a basic pre-employment check (BPSS) plus site security vetting. Submarine build, design and some defence contracts need SC clearance, and a smaller number need DV. You normally apply for clearance through the employer once an offer is made.
Which trades transfer most easily into defence work?
Electricians, welders, pipefitters, mechanical fitters, machinists, scaffolders, instrument technicians, riggers and steel fabricators all transfer directly into submarine build, dockyard refit and licensed-site work. Office-side, planners, estimators, quantity surveyors, document controllers, procurement and quality professionals are in constant demand.
How do apprenticeships and graduate routes work?
BAE Systems, Sellafield Ltd and the larger Tier 1 contractors run annual apprenticeship and graduate intakes, usually recruiting in the autumn and winter for a September start. Local colleges and training providers feed directly into those schemes.
Are these jobs long term?
The two anchor programmes are unusually long. Submarine build at Barrow is committed into the 2040s and Sellafield's decommissioning mission runs for decades, which is why the region has a steady rather than boom-and-bust pipeline.