Fire ratings for commercial floors

Key takeaways

• Floor coverings are classified for reaction to fire under BS EN 13501-1:2018 on a scale of A1fl, A2fl, Bfl, Cfl, Dfl, Efl and Ffl with s1 or s2 smoke sub-classes where the class allows them. The “fl” suffix means the classification applies to floorings specifically.
• There is no single class that applies to every commercial floor. Approved Document B sets minimum classifications by building type and by location within the building, so the class for your project comes from the applicable table and the building’s fire strategy.
• Approved Document B informs design and construction. The Regulatory Reform (Fire Safety) Order 2005 governs ongoing fire safety management once the building is occupied. They are not interchangeable and a floor can satisfy one while creating a problem under the other.
• The 18 metre threshold people quote covers two separate things: combustible materials in external walls and the higher-risk building definition. Neither is a rule about internal floor finishes.
• A classification belongs to a tested product in a defined build-up, not to a material in general. The same resin or vinyl can classify differently over a different substrate or adhesive.

Standards and guidance on this page were checked as at 29 August 2026. Approved Document B is amended frequently and further amendments come into force on 30 September 2026, so confirm the current position against gov.uk before a specification is issued.

What fire rating does a commercial floor need?

There is no universal answer and any page that gives you one is guessing. The required reaction-to-fire classification for a floor covering comes from Approved Document B, which sets minimum classifications according to building type and the location of the space within the building. Circulation routes are treated differently from rooms. The class for your project is looked up, not assumed.

That is a more useful answer than a number, because it tells you where to look. If a supplier tells you a floor “meets the regulations” without naming the building type, the location and the table it came from, they have not answered the question.

What do the Euroclass floor ratings mean?

BS EN 13501-1:2018 classifies floorings from A1fl at the top to Ffl at the bottom. A1fl and A2fl are the non-combustible and very limited combustibility classes. Bfl, Cfl, Dfl and Efl describe progressively greater contribution to fire. Ffl means no performance determined or performance below Efl.

Alongside the main class sits a smoke sub-class. An s1 rating means low smoke production and s2 means higher. Bfl-s1 therefore describes a floor that contributes very little to fire growth and produces limited smoke. It appears frequently on hospital, care and escape-route specifications, but it gets there through the building’s fire strategy or the client’s own standards rather than through a universal UK-wide rule naming it.

Class	What it means
A1fl	No contribution to fire. Typically mineral surfaces such as concrete, stone or ceramic.
A2fl	Very limited contribution to fire.
Bfl	Very limited contribution to fire growth under a radiant heat source.
Cfl	Limited contribution to fire growth, judged against a lower critical heat flux threshold than Bfl.
Dfl	Meets a lower critical heat flux threshold again in the radiant panel test.
Efl	Passes the small flame ignitability test only. No radiant panel performance is claimed.
Ffl	No performance determined or performance below Efl.

The smoke sub-classes apply to A2fl through to Dfl. A1fl is classified without a smoke sub-class and Efl and Ffl carry no smoke classification either.

How is a floor’s Euroclass determined?

By testing the complete floor build-up, not the wear layer on its own. For classes A2fl to Dfl the main class comes from the radiant panel test to BS EN ISO 9239-1 and the smoke sub-class is derived from the smoke data recorded during that same test. The small flame test to BS EN ISO 11925-2 covers ignitability and it is the test Efl is judged on. A1fl and A2fl carry additional requirements on top, including non-combustibility or calorific value testing.

The consequence matters more than the test detail. A classification is issued against a specific product, laid over a specific substrate, using a specific adhesive, at a specific thickness. Change the substrate from concrete to timber or change the adhesive and the tested classification may no longer apply. This is a common way a compliant product ends up in a floor that cannot be shown to meet its class.

Ask the manufacturer for the classification report and check that the tested build-up matches what is actually going down. A specialist contractor working from the fire strategy will do that as part of specifying the system.

What does Approved Document B say about floor finishes?

Approved Document B is statutory guidance supporting the Building Regulations in England. Volume 2 covers buildings other than dwellings, which is the volume most commercial fit-outs sit under. It sets out minimum reaction-to-fire classifications for linings and for floor coverings by building type and location and it is guidance on how compliance may be demonstrated rather than the requirement itself.

That distinction matters commercially. Following Approved Document B is one accepted route to compliance. An alternative approach supported by a fire engineered strategy is also permissible. What is not permissible is picking a class from a competitor’s blog because it appeared under a similar heading.

Circulation spaces and protected escape routes carry stricter requirements than the rooms they serve, because those are the spaces people move through while the building is being evacuated. That principle is consistent. The specific class attached to it is not and it is set by the applicable table.

Approved Document B or the Fire Safety Order: which one applies to me?

Both, at different points in the building’s life. Approved Document B supports the Building Regulations and applies at design and construction, so it governs what goes into a new build or a notifiable refurbishment. The Regulatory Reform (Fire Safety) Order 2005 applies to occupied non-domestic premises and places a duty on the responsible person to carry out and maintain a fire risk assessment.

A building owner replacing a worn corridor floor in an occupied office is operating under the Fire Safety Order. The fire risk assessment is the document that governs and the floor specification has to be consistent with it. Treating the two regimes as one is how a straightforward recover job ends up invalidating a fire strategy.

Does the 18 metre rule apply to floor finishes?

No. Two separate things sit behind the 18 metre figure and neither of them is about floors. Regulation 7(2) of the Building Regulations restricts combustible materials in the external walls of certain buildings at or above 18 metres. Separately, the higher-risk building definition under the Building Safety Act 2022 captures buildings that are at least 18 metres or at least seven storeys and contain at least two residential units. Neither is a rule about internal floor coverings and neither mandates a Bfl-s1 floor.

This misconception is widespread on flooring websites and it is worth being precise about, because a specifier who has read it will be looking for a rule that does not exist. Hospitals, care homes and residential blocks frequently do specify Bfl-s1 floors. That is a specification choice driven by the building’s fire strategy and the client’s own standards, not the 18 metre threshold requiring it.

Do England, Wales and Scotland use the same rules?

No and this is a real trap for anyone working across borders. England uses the Approved Documents. Wales has its own Approved Documents made under Welsh Ministers. Scotland uses the Building Standards Technical Handbooks, which are a separate document set with their own structure and terminology. Northern Ireland uses Technical Booklets.

The Euroclass system itself is common to all of them because BS EN 13501-1 is a European classification standard rather than a national rule. What differs is which document tells you the minimum class for a given space. Writing “UK Building Regulations require” where the source is England-only is an error a Scottish building warrant officer will spot instantly.

How do you prove a floor meets its class?

Through the manufacturer’s classification report and the product’s declaration of performance. Great Britain accepts either UKCA marking or CE marking on construction products and Northern Ireland accepts CE marking or CE marking alongside the UK(NI) indication. The declaration of performance states the reaction-to-fire class declared against the relevant harmonised or designated standard. What it does not do is establish that the tested build-up matches the one going down on your project, which is why the classification report sits alongside it.

Three things are worth checking on any project where fire performance is load bearing. First, that the classification report covers the build-up being installed rather than a similar one. Second, that the declaration is current, because classifications are reissued when a product is reformulated. Third, that the installed thickness matches the tested thickness, which catches out thin-applied resin systems in particular.

Keeping those documents in the project handover file is what makes the floor’s classification demonstrable after the event. An inspector or a fire risk assessor cannot see a classification by looking at a floor.

What is changing in 2026?

Approved Document B has been amended repeatedly and the amendments taking effect on 30 September 2026 continue that pattern. A further consultation on Approved Document B was running during 2026. Anyone issuing a specification in the second half of 2026 should confirm which version applies to their project, because the transitional provisions turn on more than one test. In outline the earlier guidance can continue to apply where the building notice, initial notice or full plans application was given before 30 September 2026 and the work has both started and been sufficiently progressed before that date or within the 18 months that follow. Read the transitional wording in the amendment itself rather than relying on a summary of it.

The practical advice is unglamorous. Date your specification, name the version of Approved Document B it was written against and re-check anything still on the drawing board in October.

What to check before you sign off a floor specification

Start with the fire strategy for the building rather than with the product. The strategy identifies the protected routes, the compartmentation and the building type and everything about the floor class follows from that. Then look up the required classification in the applicable table for the correct jurisdiction and only then shortlist products.

Check that the classification report matches the intended build-up including substrate and adhesive. Confirm whether the work falls under the Building Regulations, the Fire Safety Order or both. Record the version of the guidance you worked to and file the declarations of performance with the handover documents.

Floor coverings meeting these classifications are made by manufacturers such as Altro, Polyflor, Forbo, Gerflor, Tarkett, Sika and Flowcrete and a specialist contractor matches the tested build-up to the class the fire strategy calls for. Listing a manufacturer here does not imply a partnership, approval or accreditation.

Related reading on this site covers the wider legal framework in safety flooring regulations, the testing regime for static-controlled environments in ESD floor testing standards and the education-specific position in school flooring compliance. Sector pages sit under commercial flooring and healthcare and care flooring.

Surface Specialists is a network of vetted specialist contractors. Tell us the building type, the areas involved and the fire strategy constraints and we match the project to a contractor who works to that specification. Get in touch to arrange a site survey. Determining compliance is a matter for the building control body, the fire risk assessor or the approved inspector on the project.

Frequently asked questions

What is the minimum fire rating for a commercial floor in the UK?

There is no single minimum. Approved Document B sets minimum reaction-to-fire classifications for floor coverings according to building type and the location of the space within the building, so the class comes from the applicable table and the building’s fire strategy rather than from one figure applied everywhere. Circulation routes and protected escape routes are treated more strictly than the rooms they serve.

What does Bfl-s1 mean?

Bfl-s1 is a reaction-to-fire classification under BS EN 13501-1:2018. The “B” indicates very limited contribution to fire growth, the “fl” indicates the classification applies to floorings and “s1” indicates low smoke production. It is a performance class achieved by a tested build-up, not a regulation in itself.

Is Cfl-s1 required for escape routes?

Not as a universal rule. Escape routes and protected circulation do carry stricter requirements than general areas, but the specific class comes from the applicable Approved Document B table for that building type rather than from a blanket figure. Check the table and the building’s fire strategy rather than assuming a class.

Are hospital and care home floors required to be Bfl-s1?

No regulation names Bfl-s1 for those settings. Many healthcare and care specifications do call for it, driven by the building’s fire strategy and the client’s own standards. The 18 metre threshold often cited alongside this claim covers combustible materials in external walls and separately the higher-risk building definition under the Building Safety Act 2022. Neither has anything to do with internal floor finishes.

Does the fire class apply to the floor covering or the whole floor?

To the tested build-up. A classification is issued for a specific product over a specific substrate using a specific adhesive at a specific thickness. Changing the substrate, the adhesive or the thickness can invalidate the tested classification, which is why the classification report needs to match what is actually being installed.

What is the difference between Approved Document B and the Fire Safety Order?

Approved Document B is statutory guidance supporting the Building Regulations and applies at design and construction. The Regulatory Reform (Fire Safety) Order 2005 applies to occupied non-domestic premises and places a duty on the responsible person to carry out and maintain a fire risk assessment. A refurbishment in an occupied building can engage both.

Do Scottish projects use Approved Document B?

No. Scotland uses the Building Standards Technical Handbooks and Wales has its own Approved Documents. The Euroclass classification system under BS EN 13501-1 is common across the UK, but the document that tells you the minimum class for a given space differs by jurisdiction.

How do I prove a floor meets its fire classification?

Through the manufacturer’s classification report and the declaration of performance issued with the product. Great Britain accepts either UKCA or CE marking on construction products and Northern Ireland accepts CE marking or CE marking with the UK(NI) indication. The marking and the declaration do not by themselves show that the tested build-up matches the one being installed, so the classification report goes in the handover file too. The classification cannot be established by inspecting the finished floor.