Accredited vs Non-Accredited ISO Certification: What is the Difference?
Anyone can print an ISO certificate. What UKAS accreditation adds, why procurement teams insist on it, and how to check whether yours is genuine.
By Julian Russell, Managing Director
Lead Auditor: ISO 9001, ISO 14001, ISO 27001, ISO 45001 and ISO 50001
The short answer. Anyone can issue an ISO certificate. UKAS accreditation is the independent check that the body issuing it is competent, impartial and consistent. If your certification exists to win or keep business, it needs to be accredited, because that is what procurement teams accept.
Most of the enquiries Equas receives come from businesses approaching ISO certification for the first time. One question comes up more than almost any other: does it actually matter whether the certification is UKAS-accredited?
It does, and it matters more than most first-time buyers realise.
Here is a way to think about it. Would you be comfortable being treated by a doctor who had written their own medical certificate? Almost nobody would. Yet that is effectively what happens with non-accredited ISO certification. You could design an ISO certificate and print it yourself this afternoon. The question that matters is not "do you have a certificate", it is "who checked the checker?"
What UKAS accreditation actually means
UKAS, the United Kingdom Accreditation Service, is the UK's sole national accreditation body, appointed by government under a Memorandum of Understanding. Its job is to independently assess and monitor certification bodies, the organisations that audit businesses and issue ISO certificates, and confirm they are competent, impartial and consistent.
That creates a three-tier structure:
- UKAS sets and polices the standard for competence.
- Certification bodies are assessed by UKAS and, once accredited, may issue certificates carrying the UKAS mark.
- Your business is audited by that certification body and, if compliant, receives a certificate.
A certification body that has not been through this assessment can still call what it issues an "ISO certificate". Nothing prevents it. But nobody has checked that its auditors are competent, that its process is rigorous, or that its scope of accreditation covers the standard it has certified you against.
That is the entire distinction, and it is why the accredited route carries the "crown and tick": the UKAS symbol that appears alongside a certification body's logo on a genuine accredited certificate.
Why it matters for tenders and procurement
This is not a theoretical distinction. UK procurement increasingly treats it as a hard requirement.
The Procurement Act 2023, in force since February 2025, governs roughly £385 billion of annual public sector spend across central government, local authorities, the NHS and policing. Tenders and frameworks under it routinely specify ISO certification, and where they do, they mean UKAS-accredited certification. NHS Supply Chain tenders commonly ask suppliers to evidence certification "accredited by UKAS", with failure to provide it resulting in the bid being rejected outright.
Crown Commercial Service frameworks, NHS Supply Chain and most large private sector supply chains work the same way. In construction, the SSIP-recognised schemes such as CHAS, Constructionline and SafeContractor rely on accredited certification for mutual recognition.
If your certification exists to win or retain business, it needs the crown and tick to count. A certificate that looks identical on the wall but lacks UKAS accreditation may simply not be accepted.
The real cost of getting it wrong
We regularly hear from businesses that discover, usually at the worst possible moment, that the certification they paid for is not recognised. It surfaces in one of two ways: a tender rejected on a technicality they did not know existed, or a customer's procurement team declining to accept the certificate as evidence.
That is the difference between an investment that protects your ability to win work and money spent on a document a compliance team will quietly set aside.
At a glance
| UKAS-accredited | Non-accredited | |
|---|---|---|
| Oversight | UKAS, the government-appointed national accreditation body | None |
| Auditor competence | Independently assessed and monitored | Determined by the certification body itself |
| Recognition | Accepted by UK and international buyers, tenders and frameworks | Not guaranteed, and often rejected by procurement |
| The mark | Carries the UKAS crown and tick | No UKAS mark |
| Typical cost | Reflects rigorous, independently monitored audits | Often cheaper, reflecting a lighter process |
| Suited to | Any business bidding for tenders, working with regulated buyers, or wanting a certificate that travels | Rarely a sound long-term choice |
How to check whether your certificate is genuinely accredited
You do not need to take a certification body's word for it. There are two straightforward checks, useful both before signing with a body and if you already hold a certificate and are unsure.
Search the UKAS directory. It lists every certification body UKAS has accredited, and the specific standards and scopes each one covers. A body may be accredited for one standard and not another, so check the scope rather than just the name.
Search IAF CertSearch. The International Accreditation Forum's database lets you verify individual certificates against accredited bodies worldwide, which is useful when a supplier's certificate comes from outside the UK.
If a certification body or its certificate appears in neither, treat that as a red flag before committing any budget.
Choosing the accredited route
If the reason you are pursuing ISO certification is to win tenders, satisfy a customer, or hold a certificate recognised anywhere in the world, the accredited route is not the cautious option. It is the only one that reliably does what you need it to do.
Equas helps businesses prepare for and achieve certification from a UKAS-accredited certification body across ISO 9001, ISO 14001, ISO/IEC 27001, ISO 45001, ISO 50001 and ISO/IEC 42001. If you are unsure whether your current certificate carries the crown and tick, or want to be certain your next one does, see our ISO consultancy services or get in touch.
Accreditation is not yet available for every standard. For example, UKAS is currently piloting accreditation for BS 99001, the quality management standard for the built environment.
Frequently asked questions
Can anyone issue an ISO certificate?
Yes. No law prevents an organisation from issuing an ISO certificate without any accreditation. What UKAS accreditation adds is independent proof that the body issuing it has been assessed for competence, impartiality and consistency.
Is non-accredited certification ever the right choice?
Occasionally, for a business using a management system purely to tidy up internal processes with no plan to use it externally for tenders, customers or regulators. For almost everyone else, the risk of a rejected tender outweighs any short-term saving.
Does UKAS-accredited certification cost more?
Often, yes, because the certification body is itself being independently audited and monitored, which is reflected in its fees. It is better treated as the cost of a certificate that will actually be accepted than compared on price alone.
Is Equas a UKAS-accredited certification body?
No. Equas is a consultancy, not a certification body, and UKAS accredits certification bodies rather than consultancies. Our role is to prepare your management system and support you through the audit so that a UKAS-accredited certification body can certify you.
How do I check if my ISO certificate is UKAS accredited?
Look for the UKAS crown and tick alongside the certification body logo, then verify the body in the UKAS directory of accredited organisations, checking that its scope covers your standard. For certificates from outside the UK, use IAF CertSearch.