UK REACH vs EU REACH: Key Differences After Brexit

Before Brexit, the UK and the European Union operated under a shared chemicals regulatory framework. Since the UK's departure from the EU (Brexit), the two have gradually developed separate regulatory systems.

From 1 January 2021, Great Britain has operated UK REACH separately from EU REACH, with different regulatory authorities, substance registrations, and compliance obligations. A registration accepted by the European Chemicals Agency (ECHA) is not recognised by the Health and Safety Executive (HSE) under UK REACH. Businesses manufacturing, importing, or supplying chemicals in both markets must comply with each system independently..

The key difference between UK REACH and EU REACH is that UK REACH is administered by the HSE and applies to Great Britain, while EU REACH is administered by ECHA and applies across the European Economic Area. This article covers the structural differences between the two systems, the current registration deadlines, how the SVHC candidate lists now diverge, what the split means for Safety Data Sheets, and what businesses operating in both markets need to do.

Key Takeaways

• UK REACH came into force on 1 January 2021 under the European Union (Withdrawal) Act 2018, replacing EU REACH in Great Britain.
• The HSE administers UK REACH for Great Britain; ECHA administers EU REACH across all EU and EEA member states.
• EU REACH still applies in Northern Ireland under the Windsor Framework; UK REACH does not.
• The EU REACH SVHC Candidate List contained 251 substances as of November 2025; the UK list remained frozen at its 2021 baseline until the HSE launched its first consultation in March 2026.
• UK REACH registration deadlines have been revised to 27 October 2029, 27 October 2030, and 27 October 2031, depending on tonnage band and hazard profile (UK Government, January 2026).
• A UK REACH registration does not satisfy EU REACH obligations, and an EU REACH registration does not satisfy UK REACH obligations.
• SDS for the Great Britain market must be in English; EU REACH requires SDS in the official language of each member state where the substance is placed on the market.

What Is UK REACH and How Did It Replace EU REACH?

EU REACH, Regulation (EC) No 1907/2006, was brought into UK law under the European Union (Withdrawal) Act 2018. When the Brexit transition period closed on 31 December 2020, UK REACH came into force on 1 January 2021 as a standalone regulatory framework for Great Britain, covering England, Scotland, and Wales.

The HSE took on the role previously held by ECHA. It became the competent authority responsible for receiving registrations, maintaining the UK substance database, managing the SVHC candidate list, and issuing authorisation decisions. The Environment Agency (EA) shares responsibility for environmental aspects of UK REACH alongside the HSE.

One significant carve-out applies. Northern Ireland is not covered by UK REACH in the same way. Under the Windsor Framework, EU REACH continues to apply in Northern Ireland, meaning businesses placing chemicals on the Northern Ireland market must comply with EU REACH requirements, not UK REACH. For companies supplying both Great Britain and Northern Ireland, this creates a three-jurisdiction picture: EU REACH for the EU and EEA, EU REACH again for Northern Ireland, and UK REACH for England, Scotland, and Wales.

At their core, UK REACH and EU REACH operate on identical logic: no data means no market access. Substances of Very High Concern are still subject to the same notification and communication requirements, and animal testing remains a measure of last resort under both frameworks. Where the two diverge is in execution with separate administering bodies, independently maintained substance lists, and timelines that have started to drift apart since Brexit.

How Do UK REACH and EU REACH Compare?

The two systems share a common origin and similar structure, but they now operate entirely independently. A side-by-side comparison shows where the compliance obligations diverge.

UK REACH vs EU REACH: Structural Comparison

Registering a substance under UK REACH grants no rights under EU REACH, and vice versa. Businesses that previously held a single EU REACH registration covering the whole of the UK must now hold, or be covered by, separate registrations in each jurisdiction (Browne Jacobson).

Who Needs to Register Under Each System?

The registration obligations under each system follow the same basic logic but apply independently.

UK REACH requires GB-based manufacturers and importers of substances, in mixtures or on their own, to register with the HSE when they place those substances on the Great Britain market at or above one tonne per year. Companies that previously held EU REACH registrations were able to transfer those into UK REACH through a process known as grandfathering, subject to meeting information requirements by the applicable deadline.

EU REACH requires manufacturers and importers placing substances on the EU or EEA market at or above one tonne per year to register with ECHA. UK-based companies exporting to the EU can no longer register directly under EU REACH. They must either transfer registration obligations to an EU or EEA-based entity in the supply chain, or appoint an Only Representative (OR): an EU-established legal entity that fulfils the registration obligations of a non-EU manufacturer or importer.

Only Representatives under UK REACH work in the reverse direction. Non-GB manufacturers can appoint a GB-based OR to fulfil UK REACH registration obligations on behalf of GB-based importers.

The practical result for businesses supplying both markets: maintaining two separate registration positions, two sets of dossiers, and two compliance timelines.

What Do the Differences Mean for Safety Data Sheets?

The UK REACH and EU REACH split creates parallel SDS obligations for businesses operating in both markets.

Under UK REACH, SDS for substances and mixtures placed on the Great Britain market must be provided in English. Classification and labelling follow GB CLP, Great Britain's domestic version of the EU CLP Regulation, which governs hazard classification, labelling, and packaging. The SDS requirements under UK REACH follow the 16-section Annex II format, with exposure scenarios appended for substances requiring a Chemical Safety Assessment.

Under EU REACH, SDS must be provided in the official language(s) of each member state where the substance or mixture is placed on the market. Classification follows EU CLP. The format and section structure are the same 16-section layout, but the hazard classification data may differ from GB CLP where the two systems have diverged in their updates.

A single SDS cannot satisfy both jurisdictions. Businesses supplying Great Britain and EU member states must maintain separate, jurisdiction-specific documents. Where classification decisions have diverged between GB CLP and EU CLP, the SDS content itself will differ, not just the language.

What Do Businesses Operating in Both Markets Need to Do?

For companies manufacturing or importing chemicals into both Great Britain and the EU, REACH compliance after Brexit means maintaining two parallel compliance positions. The steps below apply to most GB-based businesses with EU supply chains or EU customers.

1. Confirm registration status under each system separately. A grandfathered UK REACH registration does not satisfy EU REACH. If the company was previously registered under EU REACH only, it will need to assess whether a GB-based importer or OR holds the required UK REACH position.
   
   
2. Appoint Only Representatives where needed. Non-GB manufacturers exporting to Great Britain should appoint a GB-based OR to fulfil UK REACH obligations. Non-EU manufacturers exporting to EU member states need an EU-based OR for ECHA registration.
   
   
3. Monitor both SVHC Candidate Lists independently. The EU list is updated by ECHA regularly. The UK list is now under active revision by the HSE, with new substances expected from June 2026. A substance may appear on one list and not the other.
   
   
4. Maintain separate SDS for each jurisdiction. GB market SDS in English under GB CLP. EU market SDS in the required language(s) under EU CLP. Track update obligations under each system separately.
   
   
5. Track UK REACH registration deadlines. The revised deadlines of October 2029, 2030, and 2031 apply to grandfathered registrations. Companies should confirm which tonnage band applies to each registered substance and plan data submissions accordingly.
   
   

Five separate things to track, two SVHC lists, two SDS formats, two sets of deadlines, across however many substances a company manages. A chemical compliance management system consolidates that tracking into one place rather than relying on spreadsheets or memory.

Final Thoughts

UK REACH and EU REACH are now distinct systems with separate authorities, separate substance lists, and independent registration timelines. They share the same core principles, but compliance with one does not satisfy the other.

The divergence is set to continue. The EU's Restrictions Roadmap targets an estimated 5,000 to 7,000 chemical bans by 2030 if fully implemented (CHEM Trust, 2024). The UK is moving at a different pace, with zero new substance restrictions adopted as of mid-2026 and its SVHC list only now beginning to be updated. Businesses supplying both markets will need to track two increasingly different regulatory environments for the foreseeable future.

The starting point is the same for both: knowing which substances are in scope, what registration position covers them, and whether the SDS reflects current obligations in each jurisdiction.

Frequently Asked Questions

Is UK REACH the same as EU REACH?

UK REACH and EU REACH share the same core principles but are now separate regulatory systems. UK REACH is administered by the HSE and applies to Great Britain. EU REACH is administered by ECHA and applies across the EU and EEA, including Northern Ireland.

Does a UK REACH registration cover EU REACH?

No. A UK REACH registration submitted to the HSE does not satisfy EU REACH obligations with ECHA, and an EU REACH registration does not cover UK REACH. Businesses supplying both markets must hold separate registration positions under each system.

Does EU REACH apply in Northern Ireland?

Yes. Under the Windsor Framework, EU REACH continues to apply in Northern Ireland. UK REACH does not apply there. Businesses supplying Northern Ireland must comply with EU REACH, not UK REACH.

What are the current UK REACH registration deadlines?

Following a January 2026 UK Government announcement, the revised UK REACH transitional registration deadlines are 27 October 2029 for substances at 1,000 tpa or above or with CMR/PBT/vPvB hazard profiles, 27 October 2030 for 100 tpa or above, and 27 October 2031 for 1 tpa or above.

How many substances are on the UK REACH SVHC Candidate List?

The UK REACH Candidate List mirrored the EU list when UK REACH came into force in January 2021. No new substances were added until the HSE launched a consultation in March 2026 on 15 proposed SVHCs, while the EU list reached 251 substances by November 2025.

Do I need a separate SDS for the UK and EU markets?

Yes. UK REACH requires SDS to be in English, with classification under GB CLP. EU REACH requires SDS in the official language(s) of each member state, with classification under EU CLP. A single document cannot satisfy both jurisdictions.