UK REACH Deadline Pushed Back to 2029: What Actually Changes

The UK REACH registration deadline that was due on 27 October 2026 has been pushed back three years to 27 October 2029. The two deadlines after it move to 2030 and 2031. If your business was racing to complete a registration dossier before October 2026, that pressure is off. What hasn't changed is everything else: your day-to-day duty to control exposure to hazardous substances under COSHH carries on exactly as before.

This is a genuine, legally-binding change, made under a statutory instrument that came into force in August 2026, not a proposal or a rumour. It's also, quietly, the third time these particular deadlines have moved.

What Actually Changed

The REACH (Amendment) (No. 2) Regulations 2026 (SI 2026/849) amends Article 127P of the retained REACH Regulation, moving the three transitional registration deadlines as follows:

• First deadline (highest tonnage and most hazardous substances): 27 October 2026 → 27 October 2029
• Second deadline: 27 October 2028 → 27 October 2030
• Third deadline: 27 October 2030 → 27 October 2031

The same instrument also pushes back the dates by which HSE must complete compliance checks on 20% of registration dossiers (from 2027, 2030 and 2035 to 2030, 2032 and 2036), keeping the checking timeline aligned with the new submission dates. The regulations were made on 16 July 2026 and came into force on 6 August 2026, having been laid before Parliament in draft on 24 March 2026 and approved by both Houses under the affirmative procedure, the same process used for the earlier extensions.

Grandfathered Registrations, Not New Ones

It's worth being precise about which registrations this touches. It applies only to substances that already had a recognised EU REACH registration and were on the GB market at the end of the Brexit transition period, the ones carried over into UK REACH under transitional, or “grandfathered,” arrangements. A substance being newly placed on the GB market for the first time follows the ordinary UK REACH registration process, and that isn't affected by this extension at all. If you're registering something new rather than carrying over an existing EU registration, this deadline change has no bearing on your timeline.

Why the Deadline Moved Again

According to the government's own explanation during the House of Lords committee stage, the driving reason is the Alternative Transitional Registration Model, a planned simplification that would reduce the amount of data businesses need to submit. DEFRA published its approach to this model on 30 March 2026, but it couldn't be implemented in time for the original October 2026 deadline, so the deadline moved instead of the simplified process being rushed.

Worth knowing plainly: this is the third extension since UK REACH replaced EU REACH after Brexit, and the full history has three steps, not two. A single transitional deadline of 27 October 2021 was originally set in 2019. That was replaced in 2020 by a phased approach, giving three new deadlines of 27 October 2023, 2025 and 2027. Those dates were then pushed to 2026, 2028 and 2030 in 2023, and now to 2029, 2030 and 2031 by this instrument. Businesses that have adjusted their compliance planning around a moving deadline before are entitled to some scepticism about whether 2029 is truly final, though the government has stated no further extension is currently planned. Each round of changes has followed the same pattern: a practical difficulty with the underlying system, addressed by buying more time rather than by simplifying the requirement itself, at least until the ATRm work is actually finished.

Who This Actually Affects

This applies specifically to businesses that manufacture or import substances into Great Britain (England, Scotland and Wales) at one tonne per year or more, where that substance was already on the market under a recognised EU REACH registration at the end of the Brexit transition period, the “grandfathered” or transitional registrations. It does not apply in Northern Ireland, which continues to operate under EU REACH directly via the Windsor Framework. It also isn't a blanket delay for every chemical-related duty a business has, it specifically concerns the REACH substance-registration dossier, not COSHH assessments, safety data sheets, or day-to-day handling obligations.

GB-based downstream users and distributors who notified HSE that they wanted to continue importing a substance under these transitional arrangements are covered by the same extended dates. If that notification was never made for a substance you're relying on, the extension doesn't help, the underlying requirement to notify HSE hasn't moved.

What Hasn't Changed

This is the part worth being clear about. The government was explicit that nothing in this instrument changes REACH's underlying aim of protecting human health and the environment, and nothing in it touches COSHH, which is a separate legal duty. An employer's obligation to assess and control exposure to hazardous substances at work doesn't pause because a substance's registration paperwork has more time. Nor does this change what needs to be on a product's safety data sheet today, or a workplace's duty to hold one. Registration status under REACH and the existence of a compliant SDS are related but distinct things, and this extension only affects the former.

It's a distinction worth repeating because it's an easy one to blur when a news headline says “REACH deadline extended.” A supplier that's still working toward its own registration dossier can, and normally does, already hold a compliant SDS for the product on the market, since SDS obligations flow from a substance's hazard classification, not from where it sits in the REACH registration timeline. Nothing in this extension gives anyone grounds to treat an SDS as optional, or exposure controls as less urgent, while a registration dossier is pending.

What To Do Now

If your business holds a grandfathered registration affected by the original October 2026 deadline, the practical answer is that the immediate pressure has eased, but the underlying task hasn't disappeared, it's simply due later. It's still worth confirming which of the three tonnage or hazard bands your substances fall into under the revised dates, since they don't all move to the same year. It's also worth watching for the detail of the Alternative Transitional Registration Model as it develops, since a lower data burden could change how much work the eventual registration actually takes. In the meantime, COSHH assessments, exposure controls and SDS management continue exactly as they did before this change.