ISO 45001 certification in the UK: UKAS accreditation, construction pre-qualification and what auditors test

Why UK organisations pursue ISO 45001 certification

Most UK projects start with a pre-qualification form rather than a board decision. A principal contractor, a facilities client, a utility or a local authority framework requires how you manage health and safety, and an accredited ISO 45001 certificate is the quickest answer a subcontractor or service provider can give.

PAS 91, the standard pre-qualification questionnaire used across UK construction and adopted by Constructionline, includes a health and safety module next to its quality, environmental and BIM modules. Holders of recognised certificates are exempt from some sections, which saves repeating the same evidence for every client. Constructionline accepts ISO certificates only from bodies accredited by UKAS or by EA, IAF or ILAC members.

Public work is the second driver. New public procurement rules came into force on 24 February 2025 under the Procurement Act 2023. Certification itself stays voluntary; the decision guide helps you judge whether your contracts justify it.

UKAS and checking an ISO 45001 certificate in the UK

UKAS assesses organisations that provide certification, testing, inspection and calibration. For ISO 45001, that means it accredits certification bodies for OH&S management systems and for defined activity scopes. It does not audit your sites, and it will not comment on a body it has not accredited, so ask each quoting body for its accreditation schedule and check that your activities appear on it.

On international recognition, UKAS signs the European co-operation for Accreditation multilateral agreement and says its accreditations remain recognised under the Global ACI arrangement, which superseded the IAF and ILAC arrangements from 1 January 2026. UKAS was not shown on the Global ACI list of recognised bodies when that list was last checked, so confirm the position on both sites if an overseas client will rely on your certificate.

UK procurement teams usually search UKAS CertCheck, a free register of UKAS-accredited management system certificates. IAF CertSearch lists certificates from other accreditation bodies, but uploads are voluntary. Absence from either register calls for a question to the issuing body rather than an assumption of fraud; the verification guide sets out the steps.

Local practice that changes the project

A legal register built on UK duties

Clause 6.1.3 asks for the legal and other requirements that apply to your hazards, and clause 9.1.2 for an evaluation of compliance against them. For a UK business, that register lists the health and safety legislation that applies to your activities, plus the site rules, client codes and pre-qualification commitments you have signed up to. The legal register guide explains how to build one from the hazard register.

The climate change decision

UKAS told certification bodies that the 2024 amendment needs no transition and no reissued certificates, but that auditors must include the new clause 4.1 text in the audit. If you decide climate change is not relevant, you must show how that decision was reached. For outdoor crews, heat and severe weather make "relevant" the more likely answer.

Site tours, multiple sites and remote audit

OH&S audits include a tour of facilities and work sites. Where UK sites carry different activities and risks, sampling is not appropriate, so each such site is audited. Remote methods cannot replace witnessing risk controls, and audit time rises with factors such as a large temporary contractor presence or public access to site. Plan the audit programme around branches, depots and live projects accordingly.

Tenders and equivalent evidence

GOV.UK guidance on conditions of participation says a buyer cannot require a particular qualification without allowing its equivalents, so keep your safety records ready to submit as well.

UK items to check, and where

How Sterling works in the United Kingdom

For ISO 45001 certification in London and elsewhere in the UK, Sterling supports clients from its London office, on site and remotely. Our expert and experienced OH&S consultants bring 8,100+ client engagements in 60+ countries since 2003, and we help you shortlist certification bodies whose accreditation covers your activities and whose certificates your clients accept. Sterling does not certify: an independent, accredited certification body audits your sites and makes the decision.

ISO 45001 in the UK: questions buyers ask