ISO/IEC 17020 inspection bodies: requirements that shape scheduling
What an ISO/IEC 17020 inspection body must build into its schedule: independence, inspector authorisation, on-site observation and the 2026 transition.
An ISO/IEC 17020 inspection body must allocate only authorised, competent inspectors, protect its independence and impartiality on every job, and monitor its inspectors, including on-site observation. ILAC P15 expects each inspector to be observed at least once per reassessment cycle unless other evidence shows continuing competence. ISO/IEC 17020:2026 was published in March 2026, with transition from the 2012 edition due by March 2029.
Key takeaways
- Independence rules decide who may inspect what, so they belong in allocation logic as well as in policy.
- Inspectors may only take jobs within their documented authorisation, which the schedule should check automatically.
- On-site observation of inspectors has to be planned into real jobs, at least once per reassessment cycle under ILAC P15.
- The 2026 edition changes independence and impartiality requirements, so review allocation rules during transition.
What does an ISO/IEC 17020 inspection body have to prove?
An ISO/IEC 17020 inspection body has to show an accreditation body that its inspection results can be trusted: that it is impartial and independent to the degree its type requires, that the people doing each inspection are competent and authorised, and that its methods, records and reports are controlled. Many of those requirements are decided at the moment a planner assigns an inspector to a job.
This guide covers the requirements that shape scheduling. Clause numbers refer to ISO/IEC 17020:2012, which most bodies are still accredited against. ISO/IEC 17020:2026 was published on 27 March 2026. Clause numbers and some requirements change in the new edition, so check where each one sits in the version you are assessed against.
A body that performs inspection: examination of a product, process, service or installation, or its design, and determination of its conformity with specific requirements or, on the basis of professional judgement, with general requirements. Typical examples include lifting equipment examination, pressure systems, electrical installations and vehicle or building inspection.
Which requirements affect the schedule?
Four areas of ISO/IEC 17020:2012 translate directly into allocation rules. Treat each as a check the schedule runs on every job, rather than a review done after the fact.
Independence (4.1 and Annex A)
Type A bodies and their personnel must not be engaged in design, manufacture, supply, installation, use or maintenance of the items inspected. Type C bodies need safeguards so the same person does not inspect their own work.
Personnel and authorisation (6.1)
Each inspector is authorised for defined inspection activities. The schedule should offer only jobs inside that authorisation; see competence verification.
Monitoring and on-site observation (6.1.8 and 6.1.9)
All inspectors are monitored, and each is observed on-site unless there is sufficient evidence of continuing competence.
Subcontracting (6.3)
Subcontracted inspectors or bodies must be competent for the work. ILAC P15 prefers accreditation as evidence of that competence.
How do independence types change allocation?
ISO/IEC 17020:2012 defines three types. Type A bodies provide third-party inspection and must be independent of the parties involved. Type B bodies are a separate, identifiable part of an organisation and inspect only for that organisation. Type C bodies may also carry out design, manufacture, supply, installation, use or maintenance of items they inspect, with safeguards to keep responsibilities separate.
ILAC P15 makes two points planners should know. A body can hold different independence types for different inspection activities, but not different types for the same activity. And Type A compliance cannot be partial: a risk analysis cannot make up for a Type A breach.
| Type | Who it inspects for | Allocation check |
|---|---|---|
| Type A | Third parties | Block any inspector, or body, involved in design, manufacture, supply, installation, use or maintenance of the item |
| Type B | Its parent organisation only | Block external clients for that activity; keep inspectors separate from design and manufacture |
| Type C | Parent and others | Block an inspector from inspecting an item they designed, installed or maintained |
Commentary on the 2026 edition reports that the A, B and C model has been significantly revised and that impartiality risks must be identified and monitored on an ongoing basis. Whatever the final mapping for your body, the allocation logic stays the same: record each inspector's involvement with clients and items, and block conflicts before a job is offered. See conflict of interest checks.
How should on-site observation of inspectors be planned?
Clause 6.1.9 of the 2012 edition requires each inspector to be observed on-site unless there is sufficient supporting evidence that they continue to perform competently. ILAC P15:05/2020 says observations should take place at least once during the accreditation reassessment cycle, with more frequent observation where the risks and complexity of the inspections, or previous monitoring results, call for it.
Observations have to happen on real jobs, so they must be scheduled. The practical approach is an observation plan: every inspector, every major inspection type, spread across the cycle, with higher-risk activities and newer inspectors earlier and more often.
- 1Observation planinspector and activity, per cycle
- 2Pick real jobsrepresentative, within the next weeks
- 3Pair observercompetent, independent of the inspector
- 4Record outcomefeeds authorisation and training
Pairing an observer with an inspector doubles the people needed on that job, and the observer must be competent in the method. Planning these pairings a quarter ahead avoids a rush before the accreditation visit. The same approach applies to trainees; see planning witnessed audits for trainees.
What changes with ISO/IEC 17020:2026?
The 2026 edition was published on 27 March 2026 with a three-year transition, after which accreditation to the 2012 edition is no longer recognised. UKAS has said transition assessments are optional from 1 September 2026 and mandatory from 1 January 2028, with all accreditations transitioned by 27 March 2029, and that it will assess transition at scheduled annual assessments.
Published summaries point to revised independence and impartiality requirements, a stronger focus on competence and monitoring, wider control of equipment and software, extended oversight of externally provided services and closer alignment with ISO/IEC 17025. Read the standard itself and your accreditation body's transition notices before changing procedures.
- 27 Mar 2026ISO/IEC 17020:2026 publishedThree-year transition begins
- 1 Sep 2026UKAS transition assessments availableOptional, at scheduled assessments
- 1 Jan 2028Transition assessment mandatory (UKAS)Remaining bodies assessed to 2026
- 27 Mar 2029End of transition2012 accreditations no longer recognised
For planning teams, the transition is a good moment to write allocation rules down in plain language and test them against the new text.
What records should the schedule leave behind?
Assessors reconstruct allocation decisions from records. For each inspection, they may ask who did it, whether that person was authorised for the activity on that date, whether any conflict was checked, and when they were last observed. If the answers live in several spreadsheets, collecting them before a visit takes days.
- ✓Inspector authorisation per activity, with dates
- ✓Independence and conflict check recorded per job
- ✓Observation plan and completed observations per inspector
- ✓Subcontractor competence evidence linked to each subcontracted job
- ✓Reason recorded when a job is reassigned
More on this in an audit trail for scheduling decisions.
How can an ISO/IEC 17020 inspection body automate these checks?
Most of these requirements reduce to rules a scheduling engine can apply on every allocation: authorisation by activity, conflict and independence blocks, observation pairings and subcontractor evidence. ScheduleAI applies them as constraints, records the reason for each choice and leaves every booking for planner approval. Statutory regimes add their own due dates on top; see statutory inspection scheduling.
For certification bodies, audit scheduling software that checks competence, rotation and windows on every audit takes most of this work off the planning team.
ScheduleAI checks inspector authorisation, independence and conflict rules on every allocation, schedules on-site observations into real jobs and logs the reason for each decision for accreditation assessments.
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What is an ISO/IEC 17020 inspection body?
An organisation that performs inspection and is accredited against ISO/IEC 17020, the standard setting requirements for the competence, impartiality and consistent operation of inspection bodies.
How often must inspectors be observed on-site?
Under the 2012 edition each inspector is observed on-site unless there is sufficient evidence of continuing competence. ILAC P15 expects at least one observation per reassessment cycle, more where risk requires.
What are Type A, B and C inspection bodies?
In the 2012 edition, Type A bodies are independent third parties, Type B inspect only for their parent organisation, and Type C may also design, supply, install or maintain what they inspect, with safeguards. The 2026 edition revises this model.
When must bodies transition to ISO/IEC 17020:2026?
The transition ends on 27 March 2029. UKAS makes transition assessment optional from 1 September 2026 and mandatory from 1 January 2028; check your accreditation body's notice.
How do accreditation bodies assess inspection bodies?
Through office assessments and witnessing of inspections across the accreditation cycle; see the ISO/IEC 17011 accreditation cycle.