How do I get security clearance in the UK? (2026 update)

​Gaining security clearance is often essential for many public or government-related projects. From aerospace and defence to nuclear, cybersecurity and government technology, thousands of roles require candidates to pass formal vetting before they can start.

The level of clearance you need depends on the project and the sensitivity of the information involved. Some roles require basic checks. Others require enhanced or developed vetting. So, how do you actually get security clearance in the UK?

For contractors and permanent professionals alike, the process isn’t something you apply for independently. Clearance is sponsored by an employer once you’ve secured a role that requires it.

At Morson, we process over 21,000 security checks every year. We work at the sharp end of secure projects across aerospace, nuclear, and cybersecurity, so we understand exactly what’s required and how to help candidates navigate the process smoothly.

First things first: you can’t apply on your own

One of the biggest misconceptions about UK security clearance is that it’s something you can apply for independently. You cannot apply for UK security clearance yourself. It must be sponsored by an employer.

Security clearance is a sponsor-led process. That means you must be offered a role with an employer who is authorised to request vetting on your behalf. Typically, that will be a government department, a defence contractor, or a List X organisation handling sensitive material.

The vetting itself is conducted under the authority of United Kingdom Security Vetting (UKSV). They set the framework. Your employer initiates the process and then you can complete the information.

What security clearance actually means

Officially known as National Security Vetting (NSV), security clearance is a structured assessment of whether you can be trusted with classified information or access to sensitive sites.

There are four main levels you’ll encounter:

BPSS (Baseline Personnel Security Standard) 

A foundational pre-employment screening check to prove identity, right to work, employment history, immigration status and unspent criminal convictions. It is required for anyone accessing UK government data, assets, or premises, including civil servants, contractors, and armed forces. BPSS is often mistaken for security clearance. But BPSS is not a formal security clearance, it is a screening standard. 

In terms of the length of the process, it is relatively quick. When the documentation is in order, it can take 5-10 days.

CTC (Counter-Terrorist Check)/Level 1B

It is required for any roles close to public figures or sensitive sites, assessing risk of involvement in terrorism. 

It is designed to assess the risk of involvement in terrorism. The checks go deeper than BPSS but remain proportionate to the level of exposure. In many cases, the clearance is processed within a few weeks, depending on workload and complexity.

You’ll often see CTC required in certain civil nuclear, policing support, or infrastructure environments. In many cases, this clearance is processed within a few weeks, depending on the workload and complexity.

SC (Security Check) 

If you work in aerospace, defence technology, cyber, nuclear engineering or secure government IT, SC clearance is the one you’ll hear most. 

SC is required for frequent access to SECRET or occasional access to TOP SECRET information. It usually involves a review of your financial history, residency, employment record and personal background.

While this isn’t a rigid rule, applicants are typically expected to have lived in the UK for several years prior to application. Extended periods overseas can lengthen the process while additional checks are completed. But on average, it takes 7-10 days to complete.

After processing, SC is valid for 5-10 years. Whether you’re a permanent staff or a contractor, it is important to note that you cannot start work until the clearance is formally granted.

DV (Developed Vetting) 

DV is the highest level of national security clearance, required for roles with frequent, uncontrolled access to TOP SECRET or highly sensitive assets or intelligence.

In addition to financial scrutiny and background checks, DV may include an in-depth interview and referee contract. The purpose is to build a complete picture of personal and professional reliability.

DV clearance can take between 6 to 9 months. For senior defence programmes, intelligence roles, or certain high-security nuclear projects, DV is non-negotiable.

Step-by-step security clearance process

From the outside, security clearance can seem opaque but, in reality, it follows a structured order.

It all starts with sponsorships. Once you’ve accepted the offer, your employer initiates the process. You’ll receive a link from the United Kingdom Security Vetting unit (UKSV) giving you access to a secure portal to complete a detailed security questionnaire.

You will need to provide more detailed information, the UKSV will conduct a vetting investigation, and will look into things like your financial history, employment and education or even family history. 

After the submission, the process largely moves behind the scenes. For SC clearance, many applications hear back within several weeks. For higher-level clearances, like DV, you may be asked to complete an interview with a vetting officer to discuss your background.

If you are not sure about what information you need to provide you should always ask your employer or whoever is managing the vetting process.

Security clearance for a job in aerospace

In many aerospace and defence engineering roles, clearance is often built into the job specification from day one, as it might involve working with sensitive data, high-profile personnel and establishments.

Whether it is working on military aircraft systems, integrating defence software, supporting secure communication networks, these environments operate on controlled access.

SC is the most common vetting process for aerospace jobs, but beyond it, employees in aerospace and aviation are required to apply for Accreditation Check (AC). Since 2022, AC has been a legal requirement for those needing an Airport Identification Card, air cargo employees to airline pilots.

Security clearances to work at a nuclear new build site 

The UK’s nuclear expansion has brought renewed focus to vetting requirements. Projects, such as Sizewell C require strict access control. Engineering, safety and commissioning roles frequently demand BPSS as a minimum, with SC clearance required for broader system access.

Given the long-term nature of nuclear infrastructure projects, clearance often becomes part of a professional engineer’s career footprint.

As technical industries converge and geopolitical tensions remain high, the demand for security-cleared engineers, cyber specialists and programme leaders continues to rise.

It is important to note that many professionals might require slightly different levels of security clearance. If you’re currently searching for security cleared jobs, view open technical roles.
 

Security clearance FAQs

Can I apply for security clearance?
Employees cannot apply for security clearance, it is the responsibility of the employer or recruitment partner to conduct a screening and background checks to ensure all employees are security cleared. 

What is the security clearance process?
Your employer will enter you into a regulated vetting process, this process should fully comply with the guidelines set by the UKSV. The USKV sets the guidelines of the security clearance process that ensures the relevant information is vetted.

​How long will it take to become security cleared?
The time it takes to become security cleared can depend on the level of clearance you need. A basic Baseline Personnel Security Standard (BPSS) check can take around 7-10 days. Whilst a more high-level Developed Vetting check can take up to 9 months to complete.

Will I have to get security cleared again?
​Security clearance often lasts for the duration of the employment contract. This means when your contract ends with one employer and you start work on a new project, you will likely need to get security clearance again. If you’re working on the same contract for over 10 years, then your security clearance will be renewed, and you will need to provide new information. If you are a migrant contractor your security clearance will need to be renewed every 12 months until you attain ‘indefinite leave to remain’ status.

Can you get a security clearance after a career break? 
Yes. Career breaks do not automatically disqualify you. You can obtain or regain security clearance but it depends on the length of the break, time spent overseas, the clearance level required. For instance, if you’ve been out of a cleared role for over a year, you need to start a new SC/DV application.

Is security clearance the same as vetting? 
Some people might confuse BPSS with security clearance. Security clearance (CTC, SC and DV) is a formal, transferable security clearance whereas BPSS is technically a pre-employment screening process.

What engineering jobs that require security clearance?
Engineering jobs in defence, aerospace, and government sectors often require security clearance. Roles that might involve sensitive technology or data, like Software, Cyber, DevOps, Mechanical and Electrical Engineers.

How to fast-track your SC clearance?
There’s no official fast-track but you can avoid delays by ensuring the provided information is complete, correct and submitted without gaps.