ISO Accreditation vs Certification

ISO accreditation is the formal recognition that a certification body is competent and impartial enough to assess organisations against ISO management system standards. Accreditation is granted by a national accreditation body, such as UKAS in the United Kingdom, which works to the international rules set out in ISO/IEC 17011.

The accreditation body assesses certification bodies against requirements covering technical competence, conflict of interest controls, auditor qualifications, and the integrity of the certification decision process. Each scheme is assessed separately, so a body accredited for ISO 9001 is not automatically accredited for ISO 14001 or ISO 27001.

Accreditation matters most when choosing a certification body, because an accredited body’s certificates carry far more weight with regulators, customers, and supply chains. Without accreditation, audits and certificates have very limited credibility outside the issuing organisation.

ISO certification is awarded to an organisation when an accredited certification body confirms, through audit, that its management system meets the requirements of a specific standard. An ISO standard is an internationally agreed specification published by the International Organization for Standardization, covering quality (ISO 9001), information security (ISO 27001), environmental management (ISO 14001), occupational health and safety (ISO 45001), and many other disciplines. The correct term is ISO certified, not ISO approved: companies are not approved by ISO, they are certified by an accredited body.

Certification follows a three-year cycle: an initial Stage 1 and Stage 2 audit, annual surveillance audits, and recertification at the end of the cycle. The Stage 1 audit reviews documented information and readiness, while Stage 2 examines implementation in practice across the scope of the management system. Surveillance audits each year confirm the system continues to operate effectively, and recertification is a fuller reassessment before a new three-year cycle begins.

The clearest way to frame the relationship between accreditation and certification is as a chain of trust: accreditation bodies oversee certification bodies, and certification bodies audit organisations. The same distinction applies standard by standard – for ISO 9001 accreditation vs certification or ISO 27001 accreditation vs certification, the certification body must be accredited for that specific standard before it can issue valid certificates. In everyday terms, ISO accreditation is the layer of oversight that makes a certificate trustworthy. The table below summarises the main differences.

Because any organisation can offer certification, it is worth confirming that a certification body is genuinely accredited before you engage it. Look for the accreditation body’s symbol on the certificate and quotation, alongside a scheme reference showing the specific standard covered, and check the certification body’s listing on the national accreditation body’s public register – in the UK, the UKAS directory of accredited bodies. Accredited certification carries independent oversight; an unaccredited certificate is only as credible as the body that issued it, and may not be recognised by regulators, customers, or tender processes.

Whether your organisation is preparing for certification, choosing a certification body, or training internal teams, building auditing competence is the critical step. SEQM Training delivers CQI and IRCA certified courses across the most widely used ISO standards, including ISO 9001, 14001, 27001, 45001, and 42001. Courses cover the full lifecycle from foundation through internal auditor and lead auditor levels, helping your team understand ISO accreditation, what certification involves, and the audit process behind both, so you can confidently navigate any ISO management system.