ISO 14001:2015 versus ISO 14001:2026 – a clause-by-clause comparison of the standards

The question ‘how exactly does the new standard differ from the old one?’ comes up in conversations with clients almost as often as the question about the effective date itself. The answer “it’s not a revolution, but an evolution” is true, but not very practical – it says nothing about what specifically will need to be changed in the documentation, during the internal audit or in discussions with the certification body. Therefore, rather than describing the changes in narrative form, we have set out both editions of the standard side by side – clause by clause – so that you can immediately see what has been moved, what has been added and what has been removed.

Two standards, one framework

Let’s start with what hasn’t changed. ISO 14001:2026, like its predecessor, is based on the same Deming cycle (Plan-Do-Check-Act) and the same logic: the organisation’s context, leadership, planning, support, operational activities, evaluation of results, and improvement. A company with a mature, effectively functioning system does not need to dismantle it and start from scratch – it is more a case of modernisation than demolition.

However, the name of the foundation on which the standard is based is changing. The previous term ‘High Level Structure’ (HLS) is being replaced by the concept of ‘Harmonised Structure’ (HS) – a standard adopted by ISO as early as 2021 for all new and revised management system standards. This is mainly a change in terminology, but it has practical significance for companies integrating several systems at once (e.g. ISO 14001 with ISO 9001 or ISO 45001) – the numbering and logic of the clauses are to be even more consistent across standards.

Table: What has changed between edition

What exactly is changing in the individual clauses

Organisational context (point 4). This is where the change relating to climate is most noticeable. The context analysis must now take into account not only climate risks, but also a broader range of environmental issues – biodiversity loss, pressure on natural resources and pollution. In practice, this means that the register of aspects and context must be updated, rather than simply adding a single sentence about climate.

Planning (clause 6). This is where the most significant structural change has taken place. The division of the previous, combined description of risks and opportunities into two separate clauses (6.1.4 and 6.1.5) clarifies the logic of the system, but also necessitates a review of documentation – many companies had these two elements described together in a single procedure. A completely new element is clause 6.3 – planning for change. Every significant business decision (a new production line, a change of supplier, a process modification) must be assessed from an environmental perspective before it is implemented, rather than after the fact.

Support and resources (clause 7). The changes here are mainly editorial in nature, but are significant for auditors – the distinction between an ‘outcome’ (relating to the entire EMS) and a ‘result’ (the effect of a specific process, e.g. a management review) has been clarified.

Operational activities (clause 8). The scope of operational control has been extended to include suppliers and subcontractors, replacing the term ‘outsourced processes’ with the broader term ‘externally supplied processes’. This reflects the growing role of supply chains in assessing an organisation’s environmental impact.

Performance evaluation (clause 9) and improvement (clause 10). The standard places greater emphasis on ensuring that environmental data actually supports decision-making, rather than merely serving as documentation – this is a shift in philosophy rather than a specific provision, but certification bodies will look for evidence of this during audits, asking not ‘do you measure?’, but ‘what do you do with this data?’.

Does this mean that the system has to be implemented from scratch?

No. For organisations where an environmental management system is already effectively in place – with an up-to-date register of aspects, regular management reviews, and established and monitored objectives – alignment with ISO 14001:2026 simply involves reviewing and updating the documentation in a few specific areas: context and climate risks, separating risks and opportunities from action planning, a new procedure for assessing changes, and updating the approach to suppliers.

The situation is different in companies where the certificate existed mainly ‘on paper’. There, the shift from a formal to a strategic approach – that is, genuinely linking environmental objectives with business objectives – may require more work than simply adding new clauses.

Frequently Asked Questions

Does the old ISO 14001:2015 certificate lose its validity immediately?
No, there is a transition period during which organisations can adapt their management system to the new requirements without losing the continuity of their certification.

Do we need to rewrite all the system documentation?
Usually not – in most cases, it is sufficient to update specific documents (the register of aspects and risks, the change management procedure, the supplier assessment), rather than creating the system from scratch.

Do the changes only apply to large companies with extensive supply chains?
No – the changes relating to climate, risks and change planning apply to all certified organisations, regardless of size. The scale of the adaptation depends more on the maturity of the existing system than on the size of the company.