The ISO Survey is the primary source for valid management-system certificate counts. ISO now directs readers to IAF CertSearch for the latest country, standard and sector data. This guide explains how to read ISO 45001 adoption figures, what certification covers and why a certificate total is not a count of businesses or evidence of legal compliance.
ISO 45001 is an occupational health and safety management-system standard. Certification is voluntary and is separate from statutory workplace duties. The distinction between certificates, sites, organisations and workers is essential when interpreting any adoption statistic.
Key facts and figures
- Certificates ≠ companies — one organisation may hold several certificates, and one certificate may cover several sites.
- Country and year matter — rankings require a consistent dated dataset and coverage.
- Sites are separate — site totals describe certified locations, not individual employers or workers.
- 2018 — ISO 45001’s first edition was published, replacing the OHSAS 18001 framework.
- 2025 onwards — ISO says its Survey is compiled from aggregated IAF CertSearch data.
- 2024 amendment — ISO 45001 added climate-action changes to its management-system context requirements.
- 30 Sept 2021 — the deadline by which OHSAS 18001 certificates had to migrate to ISO 45001 or lapse.
- Voluntary certification — it does not replace legal health and safety duties.
Checked on 15 October 2026. ISO’s current publication route is the IAF CertSearch survey download, available through a free account. Always record the survey edition, reporting date and whether a figure counts certificates or sites.
What does the UK ISO 45001 certificate count measure?
The UK certificate total in a dated ISO Survey is a count of valid certificates within that survey’s coverage. It is not the number of distinct UK businesses. A multi-site certificate and an organisation with several certificates make those measures differ.
ISO 9001, ISO 14001 and ISO 45001 address different management-system subjects. Comparisons of adoption require the same reporting date and collection method. The table distinguishes their purposes without treating certification in one subject as evidence of compliance in another.
| Management-system standard | Main subject | What the certificate concerns |
|---|---|---|
| ISO 9001 | Quality management | The organisation’s quality management system |
| ISO 14001 | Environmental management | The organisation’s environmental management system |
| ISO 45001 | Occupational health and safety | The organisation’s OH&S management system |
Management-system certification concerns the defined scope of a system. Check that scope and the relevant sites when using a certificate as supplier information.
How should country rankings be compared?
A country ranking is meaningful only within a specified survey edition. Check the country allocation, standard, valid-certificate definition, collection coverage and whether the number is a certificate or site total. A higher count does not, by itself, prove a safer national workforce.
| Check | Question to ask | Why it matters |
|---|---|---|
| Reporting year | Which snapshot date? | A current total cannot be inferred from an older ranking |
| Standard | Is the comparison ISO 45001 throughout? | Different standards cover different subjects |
| Measure | Certificates or sites? | The two totals are not interchangeable |
| Coverage | Which accredited certificates are included? | Coverage changes can alter the reported total |
| Country allocation | How are locations assigned? | Multi-site organisations can complicate comparisons |
Use the primary survey dataset and its explanatory material when reproducing a ranking. A third-party chart without its underlying data and reference date is insufficient to establish the latest position.
How are worldwide ISO 45001 totals reported?
ISO describes its Survey as an annual snapshot of valid certificates for selected management-system standards. The current route is IAF CertSearch, where the survey dataset can be downloaded through an account. Record the edition and date alongside any extracted worldwide total.
A worldwide certificate count and a worldwide site count answer different questions. Neither measures workers covered, the quality of implementation at every location or the number of injuries prevented. Those outcomes require separate evidence.
Which milestones matter when reading adoption trends?
ISO 45001’s introduction, the OHSAS 18001 migration deadline and changes in how survey data is collected all matter to comparisons. The timeline below records the key milestones and measurement distinctions.
| Milestone | Date or measure | How to interpret it |
|---|---|---|
| First ISO 45001 edition | 2018 | Start of the ISO 45001 standard |
| OHSAS 18001 migration deadline | 30 September 2021 | Deadline for accredited migration, extended during COVID-19 |
| Climate-action amendment | 2024 | An amendment to the standard, not a certificate total |
| ISO Survey compilation change | 2025 onwards | ISO identifies IAF CertSearch as the data source |
| Certificates | Separate measure | Do not treat as a business headcount |
| Sites | Separate measure | One certificate can cover more than one location |
A change in reported totals may reflect certification activity, coverage or collection methods. Without consistent underlying data, neither a large increase nor a fall should be attributed wholly to adoption or to a particular country’s reporting.
How did the OHSAS 18001 migration affect certification?
ISO 45001 was introduced in 2018. UKAS confirmed that the migration deadline for accredited OHSAS 18001 certificates was extended to 30 September 2021 during the pandemic. That deadline is useful historical context, but does not quantify how many organisations migrated in each year.
ISO 45001:2018 received a climate-action amendment in 2024. Organisations should check the applicable current standard and certification requirements with their certification body. The existence of an amendment is different from evidence of a change in certificate numbers.
Is ISO 45001 a legal requirement in the UK?
ISO 45001 certification is voluntary. HSE explains that inspectors consider a range of evidence about how health and safety is managed. A certificate does not provide immunity from enforcement, and lacking one is not, by itself, a breach of workplace health and safety law.
InGreat Britain, employers must assess workplace risks under the Management of Health and Safety at Work Regulations 1999 whether or not they are certified. ISO 45001 includes hazard identification and assessment within a wider management system, alongside leadership, worker participation, evaluation and improvement. Certification is not simply a signed-off risk assessment.
How reliable is the ISO Survey data?
ISO says that from 2025 onwards the Survey is compiled from anonymised, aggregated IAF CertSearch data. It counts relevant accredited certificates uploaded to that database. Users should read the coverage notes and preserve the reporting date when quoting the results.
Do not assume that a change in collection leaves all earlier totals comparable. Keep primary-source extracts and record any methodological change before calculating a growth rate or country ranking. Certification figures describe adoption within the dataset, not a direct measure of workplace safety performance.
Frequently asked questions
How many companies in the UK have ISO 45001 certification?
The primary measure is valid certificates in a dated ISO Survey, not distinct companies. ISO directs users to IAF CertSearch for its latest country-level dataset. One organisation can hold several certificates and one certificate can cover several sites.
Is ISO 45001 a legal requirement in the UK?
No. Certification is voluntary and does not replace legal duties. InGreat Britain, employers must make suitable and sufficient risk assessments whether or not they hold ISO 45001 certification; Northern Ireland has separate workplace legislation.
How many ISO 45001 certificates are there worldwide?
The latest worldwide total should be taken from the dated ISO Survey dataset now hosted on IAF CertSearch. Certificate and site totals are separate measures, and neither is a count of workers or proof of safety outcomes.
How does ISO 45001 relate to risk assessment?
ISO 45001 includes hazard identification and risk assessment within a wider occupational health and safety management system. Its scope also includes leadership, worker participation, performance evaluation and improvement. Certification does not replace a suitable assessment of the actual work.
How can countries be compared reliably?
Use the same primary survey edition, standard and measure for every country. Distinguish certificates from sites, check coverage and record the reference date. A ranking alone does not show which country has the safest workplaces.
How often are these ISO 45001 statistics updated?
ISO describes the Survey as annual and now hosts it through IAF CertSearch. This page was checked on 15 October 2026. Consult the dataset’s stated edition and reference date rather than assuming every release appears in a fixed month.
Related guides
- Risk Assessment Statistics UK: Compliance Facts & Data
- HSE Enforcement Statistics UK: Fines, Prosecutions & Notices
- Work-Related Stress Statistics UK: HSE Facts & Data
- What is a risk assessment? A guide to UK workplace law
- Who can carry out a risk assessment? The competence question explained
Sources & references
- ISO — The ISO Survey and current data access
- ISO — ISO 45001:2018 occupational health and safety management systems
- ISO — ISO 45001 climate-action amendment 2024
- UKAS — Extension of the ISO 45001 migration deadline
- HSE — ISO 45001 and health and safety management systems
- Management Regulations 1999, regulation 3
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Mark writes about workplace health & safety, risk assessment and accredited online training for Risk Assessment Training, part of Online CPD Academy.