BS 476 Phase-Out in the UK

What building owners, landlords and fire-safety duty-holders need to know

If you’re responsible for fire safety in a building—whether as a business owner, landlord, facilities manager or managing agent—you need to be aware of the ongoing shift away from the long-established British Standard BS 476. The change affects how you evidence fire performance and how you demonstrate compliance during audits, refurbishments and new works.

The transition has already begun, and some key milestones have already taken effect. Understanding what has changed—and what is still to come—is essential for staying compliant.

What is BS 476, and why is it being phased out?

The BS 476 series has, for many years, set out test methods for assessing both the fire behaviour and fire resistance of building materials and components. It underpins traditional classifications such as Class 0 and Class 1, and many legacy fire-resistance ratings for doors, walls, floors and other elements.

Following several national reviews into building safety, the government committed to simplifying and modernising the classification system by moving fully to the European standards, most notably the BS EN 13501 series. These provide a clearer, more harmonised and more transparent testing framework.

As a result, BS 476 is being gradually removed from Approved Document B (Fire Safety) for England.

Key dates in the transition

2 March 2025 – already in force

As of this date, Approved Document B no longer recognises BS 476 classifications for reaction to fire (e.g., wall and ceiling linings) or roof performance for new building work in England. Only the EN system can now be used for these aspects.

2 September 2029 – the final deadline

By this date, the removal of BS 476 will be complete. Fire-resistance classifications (for doorsets, walls, floors and similar elements) will no longer be supported in the guidance. From September 2029 onwards, only EN-based classifications will be acceptable for demonstrating compliance in new work.

The industry is currently partway through this transition period, with many manufacturers in the process of updating test evidence and classification reports.

What this means for those responsible for buildings

New works and refurbishments

If you’re commissioning construction or refurbishment work now, you must ensure that all fire-critical materials and components use EN classifications. Continuing to specify BS 476-based evidence for new installations may put your project out of line with current guidance and leave you exposed during future inspections.

Existing buildings

The phase-out does not make existing BS 476-tested items unlawful. Doors, partitions, linings and floors that were compliant when installed remain permissible. However:

When components reach the point of replacement, you should use EN-classified alternatives.
For higher-risk premises, it may be worth reviewing whether legacy evidence remains appropriate.
Fire-risk assessments should reflect the changing standards landscape, especially if you rely heavily on BS 476 test data.

Documentation and evidence

Inspectors are increasingly expecting clear, traceable performance documentation. You should ensure that:

You have classification reports for all fire-resisting components (existing or newly installed).
Your building files and O&M documents clearly state which standards apply.
Any new procurement aligns with the EN system to avoid future compliance issues.

Duty-holders should avoid relying on generic descriptions such as “fire-rated to BS 476” without supporting evidence. Missing or incomplete documentation is now much more likely to be flagged during audits.

Frequently asked questions

Does the phase-out apply across the whole UK?
The confirmed deadlines apply to England via Approved Document B. Scotland, Wales and Northern Ireland maintain their own building-regulatory frameworks, though all have shown movement toward increased reliance on EN standards. Check the relevant national guidance for your region.

Do existing BS 476 products have to be removed?
No. They remain lawful as-installed. The key change is for new work. As components are replaced or renewed, EN-classified products should be used going forward.

What replaces BS 476?
The BS 476 series is not replaced by a single document but by a suite of accepted European standards, including:

BS EN 13501 – fire classification of products and building elements
EN 1634-1 – fire-resistance testing for doorsets and shutters
EN 1363 series – general fire-resistance test methods

Is BS 476 unsafe or obsolete?
No. The phase-out is about consistency and modernisation, not because BS 476 is inherently unsafe. That said, for new work it will cease to be recognised as a valid route to compliance after September 2029.

What should I be asking suppliers?
You should request EN classification documents, EN test reports and confirmation that the product will remain compliant beyond the 2029 deadline. If suppliers cannot provide these, you may need to consider alternatives.

What should duty-holders do now?

With part of the transition already in effect, now is the right time to review your fire-safety documentation and the status of the products installed across your premises. Ask yourself:

Are my fire doors, partitions and linings supported by clear, up-to-date evidence?
Does my fire-risk assessment reflect the shift away from BS 476?
Am I using EN-classified products for new work and replacements?
Would my evidence stand up to scrutiny in an audit?

If the answer to any of these is unclear, you may benefit from a professional fire-safety review. A competent assessor or fire engineer can help you understand where you still rely on legacy evidence, how to prioritise upgrades, and what you should do to remain compliant as the 2029 deadline approaches.

Acting now will help you keep your premises safe, compliant and ready for future regulatory scrutiny.

References

Approved Document B (Fire Safety), Building Regulations (UK Government)
https://www.gov.uk/government/publications/fire-safety-approved-document-b

Amendments to Approved Document B (Fire Safety) – UK Government Guidance
https://www.gov.uk/government/publications/amendments-to-approved-document-b-fire-safety-circular-and-letter/approved-document-b-fire-safety-new-updates-to-support-enhanced-fire-safety

Regulatory Reform (Fire Safety) Order 2005
https://www.legislation.gov.uk/uksi/2005/1541/contents

Fire Safety Act 2021
https://www.legislation.gov.uk/ukpga/2021/24/contents

Fire Safety (England) Regulations 2022
https://www.legislation.gov.uk/uksi/2022/547/contents

National Fire Chiefs Council – Fire Safety Guidance
https://www.nationalfirechiefs.org.uk/Fire-Safety

British Standards Institution – Status of BS 476 and transition to EN standards
https://knowledge.bsigroup.com/articles/the-changing-status-of-the-bs-476-standard-series-a-summary