Require fire engineer calculations for fire spread and evacuation
Calculating the likely rate of fire spread and the time required for evacuation, including the evacuation of those with physical or mental impairments, are matters for a qualified fire engineer. We do not think that it would be helpful to attempt to include in Approved Document B an indication of what would be acceptable because each building is different, but we recommend that the guidance draw attention to the need to make a calculation of that kind. (113.13)
- The government's annual report stated fire spread guidance development is occurring through the Approved Document B review, with industry engagement expected to conclude in 2026 (Annual Report on Progress, MHCLG, February 2026).
How was this evidence gathered?
Response
Accepted
Response
AcceptedThe government accepts this recommendation. We will address this recommendation through the ongoing Approved Document B review, led by the Building Safety Regulator. The review and industry engagement will explore ways through which Approved Document B can be updated to provide further guidance on external fire spread, while sufficiently supporting designers in considering fire spread via the external wall.
Progress Timeline
Fire spread guidance development occurring through the ongoing Approved Document B review, led by the Building Safety Regulator. Industry engagement exploring external wall fire spread guidance enhancements. (Covers Recommendations 5, 6, 7, 8, 9, 11, 12.)