Question to the Ministry of Housing, Communities and Local Government:

To ask the Secretary of State for Housing, Communities and Local Government, what the evidential basis is for proposals to remove the national BS 476-22 classification for fire door resistance from Approved Document B.

On 2 September 2024, the Government announced the withdrawal of National Classes fire testing standards from Approved Document B, ending the dual classification system in favour of the European Standard (BS EN 13501). This change aimed to enhance fire protection by simplifying compliance routes within Approved Document B (ADB) and followed scrutiny during the Grenfell Tower Inquiry where the suitability of BS 476 was questioned.

The Government recognises the potential economic impact that could result from this change. The overall impact and associated benefits were carefully evaluated to inform the policy decision and are set out in the Impact Assessment that accompanied the policy announcement.

Market analysis and sector engagement showed limited impact on developers for the reaction to fire classification. Changes took effect on 2nd March 2025, with a six-month transition period provided for fire reaction.

We identified a larger impact on sectors involved in bespoke wooden fire doors, cavity barriers, smoke vents, and roofs due to re-testing requirements for the fire resistance classification. Concerns were also raised about testing site capacity. An extended transition period of 5 years was developed through discussions with the sector allowing manufacturers time to retest their products ahead of compliance with BS EN 13501 coming into force on 2nd September 2029.

We and the Building Safety Regulator will continue to support industry to develop new standards and testing capacity to minimise disruption to supply chains through the transitional period.

The Building Safety Regulator will keep these standards under review as part of their continuous review of Approved Document B, in line with their duty under the Building Safety Act to keep the safety and standard of buildings under review in England.