Accredited vs Non-Accredited ISO Certification: What’s the Difference?
Most of the enquiries Equas receives come from businesses approaching ISO certification for the first time. Understandably, many describe themselves as complete newcomers to the process, with little idea of what building a management system involves or how the audit and certification process actually works.
One question comes up more than almost any other: does it actually matter whether ISO certification is UKAS-accredited?
It does, and it matters more than most first-time buyers realise. Here’s 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 say yes, yet that’s effectively what happens with non-accredited ISO certification. Anyone can issue an ISO certificate. You could design one and print it yourself this afternoon. The question that actually matters isn’t “do you have a certificate”, it’s “who checked the checker?”
What does “UKAS accredited” actually mean?
UKAS, the United Kingdom Accreditation Service, is the UK’s sole national accreditation body, appointed by the Government under a Memorandum of Understanding. Its job is to independently assess and monitor certification bodies (the organisations that actually audit businesses and issue ISO certificates) to confirm they’re 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, are authorised to issue certificates carrying the UKAS mark.
- Your business is audited by that certification body and, if compliant, receives a certificate.
A certification body that hasn’t been through this independent assessment can still call what it issues an “ISO certificate.” Nothing stops them. But nobody has checked that their auditors are competent, that their process is rigorous, or that their scope of accreditation actually covers the standard they’ve certified you against. That’s the entire distinction, and it’s why the accredited route carries what’s known as the “crown and tick”: the UKAS symbol that appears alongside a certification body’s logo on a genuine accredited certificate.
Why UKAS accreditation matters for tenders and procurement
This isn’t a theoretical distinction. UK procurement increasingly treats it as a hard requirement.
The Procurement Act 2023, which came into force in February 2025, governs roughly £385 billion of annual public sector spend across central government, local authorities, the NHS and policing. Individual tenders and frameworks under it routinely specify ISO certification, and where they do, it’s UKAS-accredited certification they mean. NHS Supply Chain tenders, for example, commonly ask suppliers to evidence “valid and in date BS EN ISO 9001:2015… accredited by UKAS,” with a failure to provide it resulting in the bid being rejected outright.
The Government has itself gone on record stating that it expects public sector tenders to require UKAS-accredited certification specifically. Crown Commercial Service frameworks, NHS Supply Chain, and most large private-sector supply chains work the same way. For contractors and subcontractors, the construction industry’s SSIP-recognised schemes (CHAS, Constructionline, SafeContractor and others) also rely on accredited certification for automatic mutual recognition.
In short, if your certification exists to win or retain business, whether through a tender, a supply chain requirement or a customer’s own due diligence, it needs the crown and tick to actually 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 isn’t recognised. It typically surfaces in one of two ways: a tender is rejected on a technicality they didn’t know existed, or an existing customer’s procurement team simply won’t accept the certificate as evidence.
This isn’t a small-print issue. It’s the difference between an investment that protects your ability to win and retain business, and money spent on a document that a buyer’s compliance team will quietly set aside. The 2024 ISO Survey recorded around 32,988 ISO 9001 certificates in the UK alone, and the number of businesses caught out by the accredited/non-accredited distinction each year suggests this confusion is far more common than most first-time buyers expect.
Accredited vs non-accredited ISO certification at a glance
| UKAS-accredited certification | Non-accredited certification | |
|---|---|---|
| Overseen by | UKAS (Government-appointed national accreditation body) | No independent oversight |
| Auditor competence | Independently assessed and monitored | Self-determined by the certification body |
| Recognition | Accepted by UK and international buyers, tenders and frameworks | Recognition not guaranteed; often rejected by procurement teams |
| The mark | Carries the UKAS “crown and tick” alongside the certification body’s logo | No UKAS mark |
| Typical cost | Reflects the cost of rigorous, independently monitored audits | Often cheaper, reflecting a lighter or self-designed process |
| Best suited to | Any business bidding for tenders, working with regulated buyers, or wanting a certificate that travels internationally | Rarely a sound long-term choice; occasionally used for early internal process improvement only |
How to check whether your ISO certificate is genuinely accredited
You don’t need to take a certification body’s word for it. Before signing with one, or if you already hold a certificate and aren’t sure, there are two straightforward checks:
- Search the UKAS directory. The UKAS directory of accredited organisations lists every certification body it has accredited, and the specific standards and scopes each one covers.
- Search IAF CertSearch. The International Accreditation Forum’s CertSearch database lets you verify individual certificates against accredited bodies worldwide, useful if a customer or supplier’s certificate isn’t from a UK-based body.
If a certification body or its certificate doesn’t appear in either, treat that as a red flag before you commit any budget.
Frequently asked questions
Can anyone issue an ISO certificate? Yes. There’s no law preventing an organisation from issuing an “ISO certificate” without any accreditation at all. 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 or an unconvinced customer outweighs any short-term saving.
Does UKAS-accredited certification cost more? Often, yes, because the certification body itself is being independently audited and monitored, which is reflected in its fees. Businesses should treat this as the cost of a certificate that will actually be accepted, rather than comparing price alone.
Is Equas itself a UKAS-accredited certification body? No. Equas is a consultancy, not a certification body. UKAS accredits certification bodies, not consultancies. Equas’s role is to prepare your management system and support you through the audit so that a UKAS-accredited certification body can certify you with confidence.
Choosing the accredited route
If the reason you’re pursuing ISO certification is to win tenders, satisfy a customer, or hold a certificate that’s recognised anywhere in the world, the UKAS-accredited route isn’t the cautious option. It’s the only one that reliably does what you need it to do.
Whether you’re pursuing certification for the first time or maintaining an existing one, 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’re unsure whether your current certificate carries the crown and tick, or want to make sure your next one does, get in touch with the Equas team.
