How to comply with REACH chemical regulations

How to comply with the EU and UK REACH chemical regulations when using, making, selling or importing chemicals in the UK and in the EU.

UK REACH is part of the UK’s chemicals regulatory regime. If you sell or distribute chemicals in the UK and the EU, you’ll need to follow both UK REACH and EU REACH rules.

UK REACH maintains EU REACH’s aims and principles. These include:

  • the ‘no data, no market’ principle
  • the ‘last resort’ principle on animal testing
  • access to information for workers
  • the precautionary principle

Manage your chemicals on UK REACH

If you’re based in Great Britain (England, Scotland and Wales), you’ll need to follow UK REACH regulations to manufacture, import, sell or distribute chemical substances or mixtures.

Use the ‘Comply with UK REACH’ service to:

  • submit a new registration for a substance
  • notify that you’re going to continue importing substances from the EU or European Economic Area (EEA) by submitting a Downstream User Import Notification (DUIN)
  • transfer your assets, such as registrations, to another legal entity
  • submit your Northern Ireland notification
  • manage joint registrations - claim the lead registrant role, submit a lead dossier and approve joint registration group members

Start now

Before you start

You’ll need to create a Government Gateway account to sign into the service.

Find out how to create an organisation account on the Comply with UK REACH service

This guidance includes how to create and name your accounts.

If you act on behalf of other legal entities, for example as an Only Representative, you’ll need to set up a ‘parent’ account for yourself and ‘child’ accounts for those legal entities you represent once you’ve signed into the service.

Check that your substance information is in the correct format. The service only accepts substance registrations and other submissions as i6z dossier files. You can use IUCLID 6 or a later version to create the files.

Make sure you understand your regulatory obligations under UK REACH.

You need to contact the Health and Safety Executive (HSE) to:

  • validate existing UK-held product and process orientated research and development (PPORDs), known as ‘grandfathering’
  • provide information on any authorisation matter, including new authorisation application, grandfathering of existing authorisations, and downstream user notifications of authorised uses

Full UK REACH guidance is available on the Health and Safety Executive website. This includes information on how to move goods between Northern Ireland and Great Britain.

UK REACH for businesses in Great Britain

Under UK REACH, manufacturers and importers must register chemicals that access the market in Great Britain. You must review your:

  • role in the EU REACH system
  • role in the UK REACH system
  • current supply chains

You’ll need to take certain actions to access the EU or EEA and UK markets.

UK REACH for businesses in Northern Ireland

Northern Ireland businesses moving goods to and from the EU can continue to use EU REACH. Northern Ireland notifications will enable ongoing GB market access for existing Northern Ireland-based EU REACH registrations of qualifying Northern Ireland goods (QNIGs).

Importers based in Great Britain need to submit on the UK REACH IT Service information about the substances they import from Northern Ireland to Great Britain in quantities of one tonne or more.

Find out more information including how to submit your Northern Ireland notification using the Comply with UK REACH service.

GB-held registrations: grandfathering

EU REACH registrations held by GB-based businesses have been carried across directly into UK REACH, legally grandfathering the registrations into the new regime.

GB-based holders of existing EU REACH registrations needed to complete the grandfathering process by providing basic information to the Health and Safety Executive (HSE) by 30 April 2021 using the Comply with UK REACH service.

The deadline has now closed. If you have any queries about late grandfathered registrations, contact the HSE by email:

Depending on tonnage band and hazard profile of the substance, users must comply with the full information requirements for their tonnage band under UK REACH within either 2, 4 or 6 years from 28 October 2021.

The information requirements for registration under UK REACH are the same as EU REACH.

After completing the initial stage of the grandfathering process, registrants of the same substance are placed in a substance group together within Comply with UK REACH.

Registrants can then access the contact details of other group members and start negotiating data access in order to submit a joint registration.

EU held registrations: GB downstream users

GB downstream users (who do not hold an EU REACH registration) currently importing chemicals from an EU or EEA country need to make sure the substances they purchase are covered by a valid UK REACH registration.

Businesses that relied on a registration held by an EU or EEA-based company before 1 January 2021 can continue importing substances as they did before. If businesses import substances in a quantity of more than one tonne per year, they’ll need to make sure the substances are registered for UK REACH.

Any businesses that notified the HSE by 27 October 2021 of their intention to continue importing substances from the EU or EEA by submitting a DUIN have effectively deferred their registration obligation for 2, 4 or 6 years from 28 October 2021.

If you’re a GB downstream user and did not submit a DUIN in time, you can still submit a notification. You need to do this as soon as possible if you import EU REACH registered substances into Great Britain at or above one tonne per year.

A new registration must then be submitted to the HSE within 2, 4 or 6 years of 28 October 2021. Alternatively, GB downstream users can encourage their EU or EEA supplier to appoint a GB-based Only Representative, or change their source to a GB-registered supplier.

It’s possible to submit DUINs if a chemical is covered by a registration held by an EU or EEA-based Only Representative, and then sold into Great Britain.

New registrants include anyone who wants to manufacture or import for the first time and needs to submit a full registration.

After completing the substance inquiry process, new registrants can view contact details of other members within Comply with UK REACH and start negotiating data access.

An individual registering a new substance that has never been registered under UK REACH will become the lead registrant and need to submit a lead dossier for that substance. This will make joint registration available for any future registrants. If multiple businesses want to register the same substance for the first time, they will be placed in a substance group together and a joint registration should be submitted.

Under UK REACH, new registrants are able to request any information from existing registrants if it’s needed for their registration. However, they must request information if it involves tests on animals.

Tonnage band deadlines

Under UK REACH, deadlines for the full submission of data to underpin registration dossiers will be staggered over a period of 6 years. These deadlines start from 28 October 2021, the end of the DUIN submission period. Find out tonnage band deadlines and hazard profiles on the HSE website.

EU market access for business in Great Britain

Businesses based in Great Britain previously registered with EU REACH can no longer sell into the EEA market unless they have transferred their registrations to an EU or EEA-based organisation.

GB businesses who have not done so are able to appoint an Only Representative to assume registration obligations under EU REACH or support their EU or EEA-based importers to become registrants.

They will also need a valid UK REACH registration to maintain access to Great Britain’s market.

Importing from the EU to Great Britain

EU or EEA based businesses who import chemicals into Great Britain must ensure that they are covered by a valid UK REACH registration.

These businesses can register the substance under UK REACH either through a GB-based Only Representative, or an affiliate GB importer.

Joint registrations

Joint registrations are a way of reducing costs to business and avoiding testing on animals.

Registrants share data to ensure the information needed for a registration is submitted to the HSE. They must share data on a substance’s properties in a fair, transparent and non-discriminatory way. ‘Comply with UK REACH’ enables data sharing through the formation of substance groups.

Registrants under UK REACH should jointly submit information on the intrinsic properties of the substance in a lead dossier. The information in the lead dossier will support the registrations of all members of the joint registration and contain the full information requirement for the group’s highest tonnage band. All members of the group will need to submit a separate member dossier containing certain information.

The lead registrant is responsible for approving members into the joint registration group in ‘Comply with UK REACH’. This links their member dossier to the lead dossier.

Substance groups

Substance groups are the way that ‘Comply with UK REACH’ organises registrants. They are made up of multiple businesses that all want to submit a registration for the same substance. Members of the group are able to contact each other to start the data sharing process.

Registrants of the same substance are automatically matched and put in a substance group. This is done after either:

  • submitting the initial substance identification information - in the case of grandfathered registrations
  • submitting a substance inquiry if you are a new registrant - including those who wish to register, having submitted a Downstream User Import Notification

Once a substance group is formed, members of the group can access each other’s contact details to organise a registration strategy, a cost-sharing model and group data sharing. A lead registrant should be appointed by the group to submit the joint registration dossier for that substance on behalf of all group members. The lead registrant role should be claimed on ‘Comply with UK REACH’ once the dossier is ready to be submitted.

If a substance group is already formed, new registrants should communicate directly with the lead registrant to negotiate data sharing. If the group is still forming, new registrants should communicate with the group as a whole.

Data sharing

Sharing the data needed to submit a joint registration is an important task for substance groups. If the substance group is in the process of forming, members must:

  • find out what studies are available
  • assess any data gaps within the group
  • consider other publicly available data

If a study is not available in the group, members will need to agree how to get the missing data. The group members need to agree how they will share the costs for both existing and new studies.

Businesses should agree on a process for sharing data before doing so. If members of the substance group are data owners, they may want a non-disclosure agreement. A legal agreement or a ‘Letter of Access’ (LOA) can formalise the data sharing agreement and give co-registrants and new members access rights to the data to be used in the lead dossier, for the purpose of completing their registration.

All parties must make every effort to reach an agreement on data sharing and to ensure the costs are determined in a fair, transparent and non-discriminatory way

All registrants must comply with competition law.


UK REACH includes a dispute process to help resolve issues around data sharing within the service.

Businesses can lodge a dispute with the HSE as a last resort when negotiations over data access have failed. The party submitting the dispute must provide evidence to demonstrate those negotiations took place in good faith and were fully pursued. The party the claim is being made against will also be asked to provide evidence.

The HSE assesses this evidence and decides whether both parties have made every effort to reach a negotiated settlement. This decision will not be based on the issue of cost. Parties can appeal the decision to the First-tier Tribunal.

Opt outs

A registrant can opt out of submitting certain information within a joint registration and do so separately. There are 3 scenarios where this is possible.

  1. Where the costs of submitting information jointly would be too costly.
  2. Where submitting the information jointly would disclose commercially sensitive information and is likely to cause substantial commercial detriment.
  3. If there is a disagreement over the selection of information to be submitted in the lead dossier.

If any of these scenarios apply, you must submit, along with the dossier, an explanation of why that is the case.


Authorisation is the process under UK REACH that phases out the use of hazardous substances of very high concern (SVHCs). It ensures that these SVHCs are progressively replaced by safer alternatives. Granting an authorisation allows the use of substances on the authorisation list to continue temporarily when the relevant criteria are met.

The Secretary of State makes decisions on whether to add substances to the authorisation list and grant authorisations. Consent from the Scottish ministers and Welsh ministers is required for these decisions where the matter relates to devolved competence. The Health and Safety Executive (HSE) supports these processes by providing the Secretary of State and Scottish and Welsh ministers with scientific advice.

Some decisions on whether to grant authorisations made under the transitional measures in UK REACH are, instead, informed by the opinions of the European Chemicals Agency (ECHA).

Information about transitional applications for authorisation.

UK REACH authorisation decisions are published on the authorisation decisions page.

Information on authorisations under UK REACH is on the HSE website.


UK REACH uses a restriction process to regulate the manufacture, placing on the market or use of dangerous substances, either on their own or in mixtures or articles, within Great Britain.

Such activities may be limited or banned, if they pose an unacceptable risk to human health or the environment. The restriction process is designed to manage risks that are not addressed by the other UK REACH processes or by other legislation.

The Secretary of State makes decisions to restrict substances, based on the scientific opinion of the HSE. We will publish these decisions on GOV.UK.

Get help

For help using the Comply with UK REACH service call the UK Chemicals helpline.

Telephone: 0330 159 1985

Monday to Friday, 9am to 5pm (except public holidays).

Published 23 September 2015
Last updated 17 January 2022 + show all updates
  1. Removed the 'Register a business or organisation for the Comply with UK REACH service (ODT, 13.5 KB)' and replaced with an accessible version.

  2. Information on DUIN added to ‘EU held registrations: GB downstream users’ section.

  3. Updated the Manage your chemicals on UK REACH section.

  4. You can now use the Comply with REACH service to manage joint registrations, including claiming the lead registrant role.

  5. The deadline for businesses based in Great Britain using EU REACH, to register with UK REACH (known as grandfathering) was 30 April 2021.

  6. Changes have been made to the attachment Register a business to comply with UK REACH services to reflect changes to the administration of child accounts.

  7. Updated the attached document for how to register a business or organisation on the Comply with UK REACH service. Including instructions on how to name 'child' accounts.

  8. Added the start button for the Comply with UK REACH service.

  9. Added new guidance on grandfathering, tonnage deadlines and how UK downstream users can notify the HSE, with links to complete guidance on the HSE.

  10. Updated to provide businesses more information on what they'll need to do to prepare for the 1 January 2021

  11. Added link to the process maps collection

  12. Added information on how to make, sell or import chemicals if the UK leaves the EU with no deal, and how to register on REACH after no deal.

  13. Added link to Health and Safety Executive (HSE) guidance on chemical regulations and preparing for Brexit. See 'Prepare for Brexit'.

  14. Amended link to registration support page.

  15. First published.