Detailed analysis of the 2022 amendments to Approved Document B, including changes to sprinkler requirements, wayfinding, and evacuation provisions for residential buildings.. Overview of ADB 2022 Amendments The 2022 amendments to Approved Document B (ADB) represent the most significant update to England's prescriptive fire safety guidance in over a decade. Driven by the Grenfell Tower Inquiry recommendations and the new Building Safety Act 2022, these changes primarily affect residential buildings but have wider implications for all building types. Key Change 1: Extended Sprinkler Requirements Previous Requirement Sprinklers were required only in residential buildings over 30m in height. New Requirement Automatic fire suppression systems are now required in: All new residential buildings over 11m in height (reduced from 30m) Care homes and sheltered housing (regardless of height) New schools (all sizes) This single change dramatically increases the number of buildings requiring sprinkler protection and has significant cost implications for developers. Key Change 2: Wayfinding Signage New provisions require wayfinding signage in residential buildings over 11m: Floor identification signage in all stairways Flat numbering visible from common corridors Building plans at fire service access points Consistent signage standards aligned with fire service operational requirements This responds directly to firefighter evidence from the Grenfell Tower Inquiry about difficulties navigating unfamiliar buildings during emergency operations. Key Change 3: Evacuation Alert Systems For residential buildings over 18m with a single stairway: An evacuation alert system must be provided Capable of alerting all residents simultaneously Distinct from the fire alarm system used by fire service Enabling a switch from 'stay put' to 'simultaneous evacuation' strategy This addresses the critical lesson from Grenfell that 'stay put' strategies must have a mechanism for conversion to full evacuation when conditions deteriorate. Key Change 4: Secure Information Boxes All residential buildings over 18m must now have a secure information box (premises information box) located at the fire service access point, containing: Building plans showing layout, fire compartmentation, and escape routes Information about firefighting equipment (dry risers, sprinklers, smoke control) Key holder contact information Details of any known fire safety deficiencies Key Change 5: External Wall Construction Strengthened provisions for external walls: Ban on combustible materials extended to buildings over 11m (previously 18m) Materials must achieve Class A2 s1,d0 or better Applies to external wall materials including insulation, filler materials, and some components of window systems Limited exceptions for gaskets, seals, and membranes meeting specific criteria Impact on Fire Engineering Practice The 2022 amendments affect fire engineering practice in several ways: 1. Increased complexity — more buildings now require specialist fire engineering input 2. Cost implications — sprinkler requirements add £2,000 5,000 per dwelling 3. Design coordination — wayfinding and alert systems need early integration 4. Existing buildings — no retrospective requirements, but refurbishment triggers new provisions 5. Performance based design — BS 7974 framework becomes more important for demonstrating alternative compliance Transitional Arrangements The amendments apply to building work where a building notice, initial notice, or full plans application is submitted on or after the relevant commencement date. Projects already in the system may be built to previous standards, subject to time limitations. Building control bodies should be consulted early to confirm which version of ADB applies to specific projects. How We Can Help Magnus Opifex SEVEN LTD provides expert guidance on navigating the 2022 ADB amendments. Whether you need a compliant fire strategy for a new residential development, advice on cost effective sprinkler solutions, or performance based fire engineering to optimise your design, our team delivers practical, code compliant solutions. Magnus Opifex SEVEN LTD — UK's Leading Fire Safety & Fire Engineering Consultancy 🌐 magnus opifex.co.uk 📞 +44 7486 691724 ✉️ office@magnus opifex.co.uk Founders: Nicoleta Vasile, Baroness of Brattleby — CEO, Lawyer and Barrister, Legal & Administrative Director Alina — Technical Director & Expert Fire Engineer (BEng) Head Office: Ealing Cross, 85 Uxbridge Road, London W5 5BW Magnus Opifex SEVEN LTD delivers engineering led fire engineering, fire risk assessments, CFD modelling, and building safety consultancy across the United Kingdom and internationally. With over 20 years of combined experience and a UK portfolio spanning healthcare, residential and infrastructure, we bring truly engineered solutions with a personal touch. © 2026 Magnus Opifex SEVEN LTD. All rights reserved.