How to Apply for an ATAS Certificate as a Sri Lankan Student (Step-by-Step Guide)
TL;DR: Sri Lankan students accepted onto certain UK postgraduate science, engineering, and technology courses need an ATAS certificate before they can get a Confirmation of Acceptance for Studies (CAS) or apply for a Student visa. The certificate is free, applied for online through the UK government's ATAS portal, and usually takes four to eight weeks to arrive. Apply the moment you have a conditional offer and your course's CAH3 code, since a late ATAS application is one of the most common reasons a UK visa timeline slips.
Getting a UK offer letter feels like the hard part is over. For a group of Sri Lankan postgraduate applicants, it is not. If your course sits in engineering, physics, materials science, computing, or certain other technical fields, the UK government wants to check your academic background before you can register. That check is the Academic Technology Approval Scheme, or ATAS.
Miss this step, or leave it too late, and a CAS cannot be issued. No CAS means no Student visa application. This guide walks through who needs it, what it costs, and exactly how the application works.
What is an ATAS certificate
ATAS is a security clearance run by the UK's Foreign, Commonwealth & Development Office (FCDO). It was introduced to stop sensitive technical knowledge, particularly anything connected to weapons proliferation, from being passed on through certain postgraduate courses and research programmes.
It is not a judgement on you personally. It is a subject-and-institution check. The certificate confirms that a named student, studying a named course, at a named UK university, has been cleared to proceed.
Do Sri Lankan students need one
Most likely, yes, if your course falls on the ATAS-relevant list. A small group of nationalities are exempt, including UK, EU, and EEA nationals, plus nationals of Australia, Canada, Japan, New Zealand, Singapore, South Korea, Switzerland, and the United States. Sri Lanka is not on that exempt list, so Sri Lankan applicants to a relevant course need to apply.
Whether your specific course needs ATAS depends on its CAH3 code, a subject classification your university assigns. Common examples include postgraduate degrees and research in:
Physics, chemistry, and materials science
Engineering (aerospace, mechanical, electronic, chemical)
Computer science and certain advanced computing specialisations
Biological sciences with dual-use research applications
ATAS applies to postgraduate taught and research courses. It does not apply to undergraduate degrees, except in a small number of integrated master's programmes (MEng, MPhys, and similar).
When to apply
Apply as soon as you have a conditional offer and your CAH3 code. Do not wait for your CAS or your unconditional offer.
Here is the order that actually works, working backwards from your Student visa application:
Receive your conditional offer, with the CAH3 code included or sent separately by the university
Apply for your ATAS certificate online
Receive your ATAS certificate (four to eight weeks on average)
Request your CAS from the university, submitting your ATAS certificate as part of that request
Apply for your Student visa, including the ATAS certificate as a supporting document
Skipping ahead does not save time. Universities will not issue a CAS without a valid ATAS certificate on file, so applying late simply pushes your entire visa timeline back by however many weeks the ATAS approval takes.
What you need before you start
Gather these before opening the application form:
Your CAH3 code (found in your offer letter or sent by your university's admissions or visa team)
Passport details, including passport number and expiry date
A description of your course modules or, for research students, your proposed area of research
Contact details for two referees you have known for at least three years, ideally with one being an academic contact from your previous studies
Keep the wording of your course description consistent with what your university has written in your offer letter. Mismatches between your ATAS application and your offer letter are a common reason applications get delayed or questioned.
How to apply, step by step
Go to the ATAS certificate service on GOV.UK and create an account, using a recognised email provider such as Gmail or Outlook.
Select whether you are a taught postgraduate student or a research student. These follow different sections of the form.
Enter your CAH3 code exactly as given by your university.
Fill in your personal details, passport information, and university and course details.
Enter your course module list (taught students) or research summary (research students), matching your offer letter.
Add your two referees and their contact details.
Review every field carefully. The FCDO does not correct errors after a certificate is issued. If you make a mistake, you have to submit an entirely new application and start the wait again.
Submit. There is no fee.
Processing times and validity
Standard processing runs four to eight weeks. Highly sensitive research areas, such as nuclear physics or certain aerospace fields, can take significantly longer, sometimes several months. Applications submitted between April and September tend to take longer, since this is when application volumes are highest across all nationalities.
Once issued, an ATAS certificate is valid for six months from the date of issue for the purpose of a visa application. If your course, university, or research area changes, or if your start date is delayed by more than three months, you need a new certificate. If you later apply for a further Student visa to continue the same course, you will need a fresh ATAS certificate at that point too, since each visa application requires its own valid certificate.
Common mistakes that cause delays
Applying only after receiving the CAS, rather than before requesting it
Entering a course description that does not match the wording in the offer letter
Choosing "researcher" instead of "taught/research student" on the form (these are different categories)
Submitting with an outdated CAH3 code after a course or module change
Waiting until close to the intake date, leaving no buffer for processing delays
After you receive your certificate
Check every detail on the certificate against your offer letter as soon as it arrives, including your name, date of birth, passport number, university, and course title. If anything is wrong, contact the ATAS team directly rather than proceeding with an incorrect certificate. Once confirmed correct, forward it to your university so they can issue your CAS, and keep a copy ready for your Student visa application.
FAQ
Is the ATAS certificate the same as a CAS? No. ATAS clearance from the FCDO comes first. Your university issues the CAS afterward, and for ATAS-relevant courses, it needs your ATAS certificate before it can do so.
How much does an ATAS certificate cost? Nothing. The application is free through the official government portal.
Can I apply for ATAS before I have an unconditional offer? Yes. A conditional offer with your CAH3 code is enough to start the application.
Does every Sri Lankan postgraduate student need ATAS? No, only those on courses whose CAH3 code appears on the FCDO's relevant subject list. Many postgraduate courses, particularly in business, humanities, and social sciences, do not require it.
What happens if my ATAS certificate expires before I apply for my visa? You will need to apply for a new one. There is no extension process, so timing your original application against your intended visa submission date matters.
Can a visa agent submit the ATAS application on my behalf? The application must be submitted through the applicant's own account on the official government portal. An adviser can help you prepare the information and check it for accuracy before submission.
Do undergraduate students ever need ATAS? Rarely. It mainly applies to a small number of integrated master's degrees such as MEng or MPhys, not standard undergraduate programmes.
What if I need to change my research topic after receiving my certificate? Contact your university. A substantial change to your area of research generally means applying for a new ATAS certificate before continuing.
References
Foreign, Commonwealth & Development Office, ATAS certificate service, GOV.UK — https://www.academic-technology-approval.service.gov.uk/
University of Sheffield, Academic Technology Approval Scheme guidance — https://sheffield.ac.uk/student-visas-immigration/visa-application/atas
University of Edinburgh Registry Services, Applying for ATAS — https://registryservices.ed.ac.uk/immigration/applying-for-visa/student-visa/requirements/academic-technology-approval-scheme/applying
Coventry University, ATAS certificates and exempt nationalities — https://www.coventry.ac.uk/international-students-hub/apply/atas/
University of Sussex, Applying for an ATAS certificate — https://student.sussex.ac.uk/international/visas/applying/atas
University of Leeds, ATAS certificate guidance — https://students.leeds.ac.uk/visa-information-applying/doc/atas-certificate
If your offer letter mentions a CAH3 code and you are not sure what to do next, Prosper can help you map out your ATAS, CAS, and visa timeline so nothing gets left to the last few weeks.
