Approved Document B consultation: fire design implications for UK project teams
Reviewed by Tom Sullivan

First reported on The Construction Index
30 Second Briefing
Government has opened a 12‑week public consultation, running until 17 June 2026, on proposed updates to Approved Document B, covering fire safety guidance for buildings in England. Key proposals include mandatory evacuation lift guidance for residential buildings over 18 m, revised provisions for specialised housing (alarm coverage and sprinklers), new rules on fire spread across external walls, balconies, roofs and roof‑mounted PV panels, and updated fire resistance guidance for car parks. The review also considers implementing Grenfell Tower Inquiry Phase 2 recommendations via BS 9414 for assessing external cladding systems, with any changes expected to take effect from September 2029.
Technical Brief
- Approved Document B remains the statutory guidance for satisfying fire safety requirements in England’s Building Regulations.
- Consultation explicitly asks whether proposed guidance is “clear, workable and proportionate” for designers and dutyholders.
- Grenfell Tower Inquiry Phase 2 drives the focus on clearer standards for assessing external wall systems.
- BS 9414 is singled out as the reference method for evaluating external cladding fire performance in guidance.
- Government signals a “long lead time”, with implementation of any adopted changes not before September 2029.
- Continuous review of Approved Document B is framed as part of a wider building safety system overhaul post‑Grenfell.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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