Accredited inspection
Accredited inspection explained: what accreditation actually attests to, and what it does not
Accredited inspection is inspection carried out by a body whose competence, impartiality and consistency have been assessed by an independent national accreditation body against a published standard, normally ISO/IEC 17020. The accreditation is a judgement about the organisation and the people in it. It is not a guarantee attached to any individual inspection result.
That distinction is the whole point of the concept, and it is the one most often lost in procurement documents. Accreditation answers the question "why should I trust an inspection I did not witness, performed by people I have never met?" It answers it by having a third party check the machinery that produced the result.
ISO/IEC 17020: the standard behind it
ISO/IEC 17020 specifies requirements for the competence of bodies performing inspection and for the impartiality and consistency of their inspection activities. It covers examination of materials, products, installations, plant, processes, work procedures and services, at any stage of life including design, and the reporting of the result to the client and, where required, to the authorities (ISO).
The edition matters right now. The 2026 edition, "Conformity assessment. Requirements for bodies performing inspection", was published on 27 March 2026. There is a three-year transition: UKAS began accepting assessments to the new edition on 1 September 2026, and accreditations held to ISO/IEC 17020:2012 cease to be valid on 27 March 2029 (UKAS technical bulletin). If a certificate you are relying on still cites the 2012 edition after that date, it is no longer live.
Type A, B and C inspection bodies
The standard classifies bodies by their independence from the thing being inspected, and the type is stated on the accreditation certificate.
- Type A: third party. The body is independent of the parties involved in the item it inspects. The highest independence requirement.
- Type B: an identifiable, separate part of an organisation, inspecting only for its parent body. In-house inspection with structural separation.
- Type C: first party inspection, where the body may also inspect for other organisations, and may be involved in design, manufacture or supply, subject to safeguards against the resulting conflict.
Reading the type is the fastest sanity check available. A type C body inspecting work its own organisation carried out is doing something closer to structured self certification than to independent verification, and that may be entirely appropriate. It just should not be presented as third party.
Who does the accrediting?
Each economy normally has one national accreditation body. In the UK that is UKAS, which assesses technical competence, impartiality and reliability through document review, on-site and remote assessment and, where relevant, proficiency testing (UKAS). In the United States it is ANAB, the ANSI National Accreditation Board, which accredits inspection bodies across construction, forensics and non-destructive examination among others (ANAB).
Those bodies recognise each other through the ILAC Mutual Recognition Arrangement, extended to inspection bodies in October 2012. ILAC reports 121 accreditation bodies signed to the arrangement and around 12,000 accredited inspection bodies worldwide (ILAC). The practical effect is cross-border: an inspection report from an accredited body in one signatory economy is intended to be accepted in another without being redone.
Accredited inspection: a worked example
A buyer requires an accredited pre-shipment inspection before releasing payment on a container of components. The inspection body holds type A accreditation with a scope covering that product category and the sampling method specified. The buyer is not trusting the inspector's opinion. They are trusting that an accreditation body has examined how this inspector was qualified, how the sampling plan is applied, how the equipment is calibrated and how complaints are handled, and rechecks it on a cycle.
Accreditation, certification and approval are three different things
- Accreditation: a third party attests that a conformity assessment body is competent and impartial to do specific work.
- Certification: a body attests that a product, system or person conforms to a standard. ISO 9001 certification of a company is certification, not accreditation.
- Approval: a regulator or a manufacturer authorises a party to act, such as an approved repairer on an insurer's network. Commercial or regulatory, and not an independence claim.
Vendors and contractors blur these constantly, usually by describing themselves as accredited when they hold a certification or a membership. Ask which standard, which accreditation body, which scope, and check the register. Scope is where most claims quietly fail: a body can be genuinely accredited and still be outside its scope for the work you are buying.
What accreditation does not tell you
It does not tell you the inspector who attended your site was having a good day. It does not remove inspection bias, which shows up in accredited work too. And it does not certify the technical inspection standard being applied, only that the body applies one properly.
What it does give you is a defensible answer to a regulator, an insurer or a court about why the result was worth relying on. That is a narrower claim than most marketing makes of it, and it is still the strongest one available.
Related reading: inspector competence, quality assurance inspection, and audit trail.
