UK REACH and EU REACH began as the same regulation and are now maintained separately: UK REACH by HSE for Great Britain, EU REACH by ECHA for the EU and EEA. The structures still look alike, but the two can diverge, and if you supply both markets you carry both sets of obligations. This is the highest-stakes article in this set to get right, so treat every point here as a prompt to confirm the current position with the primary source, not as a settled statement. It is practical guidance, not legal advice.
What changed, and when
When the transition period following the UK's exit from the EU ended, EU REACH stopped applying in Great Britain and a separate UK REACH regime took its place, with the existing rules brought across into UK law and HSE taking on the agency role. EU REACH continues to apply in the EU and EEA. Northern Ireland has a distinct position that you should check separately rather than assume follows Great Britain.
Who regulates which
For Great Britain, the regulator is HSE, working with the Environment Agency and with Defra as the policy department. For the EU and EEA, it is ECHA. The two do not share a register, a candidate list or an authorisation process. A decision by one is not a decision by the other.
The comparison, side by side
The table below is a general orientation, not a compliance determination. Confirm each point against HSE, ECHA or gov.uk for your specific products and role.
| Aspect | UK REACH (HSE) | EU REACH (ECHA) |
|---|---|---|
| Regulator | HSE is the agency for UK REACH in Great Britain, working with the Environment Agency and Defra. | ECHA administers EU REACH for the EU and EEA. |
| Geographic scope | Great Britain (England, Scotland, Wales). Northern Ireland has a distinct position; check the current arrangements. | EU and EEA member states. |
| Registration | Own registration regime with transitional arrangements for substances already registered under EU REACH. Deadlines have been subject to change; confirm current dates with HSE and Defra. | Registration with ECHA under EU REACH. |
| Classification (CLP) | GB CLP, the retained version of CLP, with a GB mandatory classification list. Classifications can differ from the EU. | EU CLP, with EU harmonised classification and labelling. |
| Candidate List and authorisation | A GB Candidate List and authorisation process run by HSE. Can diverge from the EU list. | The EU Candidate List and authorisation process run by ECHA. |
| Safety data sheets | Must meet GB requirements and reference GB CLP. Format broadly aligned but maintained separately. | Must meet EU requirements and reference EU CLP. |
| Communication in the supply chain | Duties retained under UK REACH, including the Article 33 communication duty for candidate-list substances. | Article 33 communication duty under EU REACH. |
Where the two are diverging, and what it means
The regimes started identical, so the practical risk is not that they look different today but that they drift apart over time. A substance can be added to one candidate list and not the other. A classification can be decided in one regime first. A registration position can differ. Each divergence means the answer to "is this product compliant?" now depends on which market you mean, and a document that was correct for both can quietly become correct for only one.
Maintaining two regimes by hand?
We build a source of truth that tracks both regimes against your products and flags divergence, so a change in one does not silently break your documents for the other. A short technical call, no pitch.
Book a technical callThe cost of maintaining two document sets
The operational cost of dual-regime work is rarely a single big bill. It is the steady drag of doing everything twice: two classifications to keep current, two candidate lists to monitor, two sets of safety data sheets to revise and distribute, and the cross-checking to make sure a change in one has been reflected, or deliberately not reflected, in the other. It scales with the number of products you sell into both markets, which is why it lands hardest on suppliers and distributors with broad ranges. The same pattern shows up across the whole documentation burden in the chemical and process industries.
A checklist for companies supplying both markets
- Map each product to the markets it is sold into, so you know which regime or regimes apply to it.
- Maintain classification against both GB CLP and EU CLP where a product is sold in both, and flag any divergence.
- Track both candidate lists, because a substance can be listed in one before or without the other.
- Keep two aligned sets of safety data sheets where required, each referencing the correct classification.
- Watch the transitional registration position for Great Britain and confirm current deadlines with HSE and Defra.
- Record which regime each customer declaration covers, so a dual-market customer is not left guessing.
Frequently asked questions
Is UK REACH the same as EU REACH?
They share the same origin and much of the same structure, but since the end of the transition period they are separate regimes: UK REACH is administered by HSE for Great Britain and EU REACH by ECHA for the EU and EEA. They can and do diverge, so do not assume a position in one applies in the other. This is practical guidance, not legal advice.
Who regulates UK REACH?
HSE is the agency for UK REACH in Great Britain, working with the Environment Agency and with Defra as the policy department. ECHA has no role in UK REACH.
Do I need to register a substance twice?
If you place a substance on both the GB and the EU or EEA markets, obligations can arise under both regimes. What applies to you depends on your role, your volumes and existing registrations. Confirm your specific position with HSE, Defra and, for the EU, ECHA.
What about Northern Ireland?
Northern Ireland has a distinct position from Great Britain under the current arrangements. The detail matters and changes, so check the current guidance from HSE and gov.uk rather than assuming it follows Great Britain.
Sources
UK REACH and EU REACH are maintained separately and change over time. Confirm every point against the primary authorities for your specific products and role before relying on it. This article is practical guidance, not legal advice.
How we take documentation and knowledge work off regulatory and technical teams.
Maintaining two aligned sets of safety data sheets is where dual-regime cost shows up.
Customers supplying both markets ask which regime your answer covers.