Three Years to Go: Is Your Fire Resistance Evidence Ready for 2029?
- 4 days ago
- 3 min read
On 2 September 2026, we reach exactly three years until references to BS 476 for fire resistance are removed from Approved Document B. From 2 September 2029, manufacturers, specifiers and building control bodies in England will no longer be able to rely on Approved Document B's references to BS 476 fire resistance testing.
Three years can sound like plenty of time. In practice, transitioning a product’s fire performance evidence from BS 476 to the EN testing and classification system is rarely a quick job. It's worth understanding now what that transition actually involves - and why the manufacturers who start planning early will be in a stronger position than those who leave it late.
What's Actually Changing
Approved Document B currently allows fire resistance to be demonstrated using either the British Standard (BS 476) test methods or the European (BS EN) equivalents. From September 2029, the BS 476 route is removed from the guidance.
Products will need fire resistance evidence based on the EN testing and classification system, principally to BS EN 13501-2, supported by testing to the relevant BS EN test standards.
This doesn't mean every BS 476 report becomes worthless overnight, or that every product needs retesting immediately. It means that, from that date, BS 476 evidence will no longer be recognised as a route to compliance under Approved Document B guidance for new specifications.
Why Three Years Isn't as Long as It Looks
A transition programme for a single product range can involve several distinct stages:
Evidence review – establishing exactly which products, configurations and applications currently rely on BS 476 test data.
Gap analysis – identifying where existing EN evidence already exists, where it's partial, and where none exists at all.
New testing or assessment – scheduling fire resistance tests where necessary and using Extended Field of Application (EXAP) reports to extend the scope of existing EN test evidence.
Certification updates – updating third-party certification schedules and technical documentation to reflect the new evidence base.
Each of these stages takes time, and they don't always run in a straight line. A test result that falls short of expectations can send a product back to development before retesting is possible. Factor in enough of those cycles and a three-year window starts to look considerably shorter.
Testing Capacity Is Worth Thinking About Now
As the deadline approaches, it's realistic to expect testing laboratories to see increased demand from manufacturers all working towards the same date. Booking slots, sample preparation and furnace availability all become harder to secure the closer you get to 2029. Manufacturers who plan their testing programmes early are more likely to secure the dates that suit their production and commercial timelines, rather than working around whatever capacity remains.
Prioritising Where It Matters
Not every product needs attention at once. A practical starting point is to prioritise based on:
Commercial importance – which products or ranges generate the most volume or margin.
Current specification activity – products actively being specified into live projects should take priority over those with limited ongoing demand.
Evidence gaps – products with no EN evidence at all versus those where an EXAP could extend existing test data relatively quickly.
This kind of triage means resources go where they can have the greatest impact, rather than treating the whole portfolio as equally urgent.
What Manufacturers Should Do in 2026
Your priority should be to understand where you are in the transition cycle:
Which products still depend solely on BS 476 evidence?
Where does EN evidence already exist, and does it cover the full scope you need?
Starting this work now, rather than in 2028 or 2029, means testing costs can be spread over a longer period, laboratory slots can be booked with more flexibility, and technical decisions can be made without the pressure of an approaching deadline.
How UKTC Can Help
UKTC works with manufacturers of passive fire protection and construction products to plan exactly this kind of transition. That includes fire resistance testing to current EN standards, review of existing test evidence, scoping analysis to identify gaps and opportunities for test programme planning, classification reports and EXAP development.
If you want to understand where your product range stands against the 2029 deadline, speak to UKTC. We can review your existing evidence, identify gaps and help you build a structured testing and transition programme.
