UK Registration, Evaluation, Authorization, and Restriction of Chemicals: Establishes Chemical Registration, Evaluation, Authorization, and Restriction Requirements Across Great Britain Supply Chains

What’s Required

1. Registration of substances placed on the GB market

UK REACH requires companies to register substances manufactured in, or imported into, Great Britain in quantities of one tonne or more per year, unless an exemption applies. Registration can apply to substances on their own, substances in mixtures, and in some cases substances in articles. HSE states that UK REACH retained the principle of “one substance, one registration.”

Companies need to assess:

• Substance identity.

• Annual tonnage.

• Manufacturer or importer role.

• Whether the substance is on its own, in a mixture, or in an article.

• Exemptions.

• Existing UK REACH registration status.

• Data-sharing obligations.

• Registration dossier requirements.

• Chemical safety assessment needs.

• Supply-chain uses.

A company cannot assume that an EU REACH registration automatically covers the GB market. UK REACH and EU REACH now operate separately.

2. New registrant obligations

New GB manufacturers or importers must submit an inquiry before registration where required, then submit a registration dossier through the Comply with UK REACH service. HSE guidance states that once an inquiry number is received, the company can submit its registration dossier through Comply with UK REACH.

New registrants should prepare:

• Substance identity information.

• Analytical data.

• Tonnage band.

• Uses and exposure information.

• Hazard data.

• Classification and labeling.

• Chemical safety report where required.

• Data-sharing arrangements.

• Joint submission where applicable.

• IUCLID dossier.

3. Transitional registrations, grandfathering, and DUIN

UK REACH created transitional arrangements for companies that previously relied on EU REACH registrations or imported chemicals from the EU before the end of the Brexit transition period.

Two important routes are:

• Grandfathering, for certain GB-based holders of EU REACH registrations.

• Downstream User Import Notification, or DUIN, for GB-based downstream users or distributors importing from the EU or EEA before UK REACH took effect.

HSE states that companies using DUINs must submit a new registration to HSE if they wish to continue importing into Great Britain after the relevant transitional deadlines, which now fall on October 27, 2029, October 27, 2030, or October 27, 2031, depending on tonnage band and hazard profile.

Grandfathered registrants also need to submit relevant information from their former EU registration dossiers to HSE by the applicable deadline. HSE states that these dossier submission deadlines are October 27, 2029, October 27, 2030, or October 27, 2031, depending on tonnage and hazard profile.

4. Evaluation by HSE

UK REACH includes evaluation processes through which HSE can examine registration dossiers and substances. Evaluation can lead to requests for further information or regulatory action where risks are not adequately controlled.

Companies should expect scrutiny of:

• Data completeness.

• Testing proposals.

• Exposure scenarios.

• Chemical safety reports.

• Substance identity.

• Read-across or grouping justifications.

• Use and exposure assumptions.

• Risk management measures.

UK REACH also requires HSE to carry out compliance checks on a portion of registration dossiers. UK parliamentary materials in 2026 referred to the legal requirement for HSE to carry out compliance checks on 20% of registration dossiers and discussed amended timetables linked to the new transitional registration deadlines.

5. Authorization of substances of very high concern

UK REACH includes an authorization system for substances of very high concern, or SVHCs. Substances may be added to the UK REACH Candidate List and later become subject to authorization requirements. HSE guides companies that may need to apply for a UK REACH authorization.

Companies using authorization-listed substances may need to:

• Apply for authorization.

• Demonstrate adequate control or socio-economic justification.

• Analyze alternatives.

• Provide substitution plans where relevant.

• Notify downstream use.

• Communicate authorization conditions.

• Review use before sunset dates.

Authorization is important because it can restrict continued use of high-risk substances even where a company has historically used them lawfully.

6. Restrictions on manufacture, supply, and use

UK REACH allows restrictions on the manufacture, placing on the market, or use of substances where risks are not adequately controlled. HSE maintains information on UK REACH restrictions and the registry of restriction intentions.

Restrictions can affect:

• Chemicals on their own.

• Chemicals in mixtures.

• Chemicals in articles.

• Consumer products.

• Industrial uses.

• Professional uses.

• Imports.

• Manufacturing processes.

• Waste and recycling streams.

Restrictions are especially important for substances such as PFAS, persistent chemicals, hazardous solvents, carcinogens, mutagens, reproductive toxicants, sensitizing substances, and other high-risk chemicals. [Important]

7. Supply-chain communication

UK REACH depends heavily on information flowing through the supply chain. Manufacturers, importers, distributors, and downstream users need to ensure that safe-use information is communicated.

This can include:

• Safety data sheets.

• Exposure scenarios.

• Use descriptors.

• Risk management measures.

• Classification and labeling.

• Authorization conditions.

• Restriction information.

• SVHC information for articles.

• Supplier declarations.

• Customer communications.

Poor supply-chain communication can create compliance failures even where a substance is technically registered.

8. Northern Ireland distinction

UK REACH applies to Great Britain, meaning England, Scotland, and Wales. Northern Ireland requires separate legal analysis because post-Brexit arrangements can make EU REACH relevant for certain Northern Ireland movements and market access situations. HSE describes UK REACH as applying to substances manufactured in or imported into Great Britain.

Companies trading across Great Britain, Northern Ireland, and the EU should map:

• GB obligations under UK REACH.

• Northern Ireland obligations under EU-related arrangements.

• EU obligations under EU REACH.

• Importer identity.

• Only representative structures.

• Distributor versus importer roles.

• Substance registration status in each market.

This is one of the most important practical compliance issues for UK chemicals trade.

Important Deadlines

• January 1, 2021: UK REACH starts

EU REACH was brought into UK law from January 1, 2021 as UK REACH. UK REACH and EU REACH now operate independently.

• October 27, 2021: original DUIN notification deadline

The DUIN system allowed certain GB downstream users and distributors that had imported from the EU or EEA before UK REACH to notify HSE and defer full registration duties. The transitional registration system has since been extended.

• October 27, 2029: first transitional registration deadline

The first major current transitional deadline is October 27, 2029. It applies to higher-priority substances based on tonnage and hazard profile, including substances at 1,000 tonnes or more per year and certain hazardous substances, according to HSE’s current transitional registration guidance.

• October 27, 2030: second transitional registration deadline

The second deadline is October 27, 2030, applying to the next tonnage and hazard categories under the amended transition timetable.

• October 27, 2031: third transitional registration deadline

The final current deadline is October 27, 2031, applying to remaining lower-tonnage transitional registrations under the amended schedule.

• 2026: amendment process to extend deadlines

The UK government said it intended to move transitional registration submission deadlines from October 27, 2026, 2028, and 2030 to October 27, 2029, 2030, and 2031. UK parliamentary material in 2026 described the deadline changes as necessary because the alternative transitional registration model could not be implemented before the previous first deadline.

Current Status

UK REACH is active and legally operational in Great Britain. HSE is the UK REACH Agency and guides registration, evaluation, authorization, restrictions, grandfathering, DUINs, reports, and work programs.

Current status:

• Active in Great Britain.

• Independent from EU REACH.

• Administered by HSE as the UK REACH Agency.

• Implemented through the Comply with UK REACH service.

• Transitional registration deadlines currently extended to 2029, 2030, and 2031.

• Evaluation, authorization, and restriction systems remain in operation.

• Northern Ireland requires separate legal analysis because EU REACH-related rules may apply.

• Defra has been exploring an Alternative Transitional Registration model, or ATRm, to reduce duplication and costs associated with obtaining EU REACH data. UK parliamentary debate in 2026 stated that the Government intended to replace current transitional information requirements and reduce the estimated £2 billion cost to businesses by around 70%.

UK REACH should therefore be treated as a live chemicals regime with ongoing reform and transition complexity.

Penalties for Non-Compliance

Penalties arise through UK REACH enforcement regulations and domestic enforcement by competent authorities. HSE and other enforcement bodies can take action depending on the nature of the breach.

Possible consequences include:

1. Market access restriction

A substance may not legally be manufactured, imported, supplied, or used in Great Britain if registration, authorization, or restriction requirements are not met.

2. Enforcement notices

Authorities may issue notices requiring corrective action, information, cessation of supply, or changes to risk management.

3. Administrative or criminal penalties

Breaches of chemicals regulation can lead to legal enforcement, including prosecution in serious cases.

4. Supply-chain disruption

Customers may refuse substances, mixtures, or articles where registration status, SDS information, authorization status, or restriction compliance cannot be demonstrated.

5. Product withdrawal or recall

Products containing restricted substances or inadequately controlled chemicals may need to be withdrawn or recalled.

6. Loss of authorization

Companies using substances subject to authorization may lose the ability to continue use if authorization is refused, expires, or conditions are not met.

7. Customs and import disruption

Importers may face delays or refusal if they cannot demonstrate legal access to the GB market.

8. Contractual liability

Suppliers may breach contracts if chemicals or products are not UK REACH-compliant.

9. Reputational and ESG risk

Failure to manage hazardous chemicals can undermine sustainability claims, product safety assurances, and circular economy strategies.

Examples of Known Violations / Failure Modes

Typical violations and failure modes include:

• Importing a substance into Great Britain without a valid UK REACH registration.

• Assuming an EU REACH registration is sufficient for GB market access.

• Missing transitional registration deadlines after submitting a DUIN.

• Failing to submit required grandfathering dossier information.

• Misidentifying the importer or only representative.

• Underestimating tonnage and applying the wrong registration band.

• Failing to update registration after changes in use or volume.

• Submitting incomplete substance identity information.

• Not sharing data with other registrants for the same substance.

• Supplying a restricted substance or mixture in breach of UK REACH restrictions.

• Continuing use of an authorization substance without valid authorization.

• Providing outdated or incomplete safety data sheets.

• Failing to communicate exposure scenarios to downstream users.

• Importing articles containing SVHCs without required information.

• Treating Northern Ireland and Great Britain as identical chemical markets.

• Making “safe” or “non-toxic” claims without chemical hazard evidence.

Resources

• https://www.hse.gov.uk/reach/

• https://www.hse.gov.uk/reach/about.htm

• https://www.hse.gov.uk/reach/registration.htm

• https://www.hse.gov.uk/reach/reach-registration.htm

• https://www.hse.gov.uk/reach/new-registration.htm

• https://www.hse.gov.uk/REACH/duin.htm

• https://www.hse.gov.uk/REACH/grandfathering-registrations.htm

• https://www.gov.uk/guidance/how-to-comply-with-reach-chemical-regulations

• https://www.gov.uk/government/consultations/uk-reach-extending-dossier-submission-deadlines-for-transitional-registrations/outcome/summary-of-responses-and-government-response

• https://www.gov.uk/government/publications/reach