Circular 01/2025 introduced corrections to ADB Volumes 1 & 2. A further amendment booklet has been published taking effect 30 September 2026, with high-rise residential implications.. Where We Are Today The currently published statutory guidance is the Approved Document B 2019 edition incorporating the 2020, 2022 and 2025 amendments (Circular 01/2025, published 2 March 2025). MHCLG also issued an amendment booklet with provisions taking effect on 30 September 2026 . Key Provisions in the 2026 Amendment Booklet Second staircase threshold for residential buildings ≥18 m — clarifies design expectations for new high rise residential buildings. Drafting and consequential corrections — refinements to provisions on means of escape, fire resisting construction, and external fire spread. Implementation date — guidance takes effect 30 September 2026; check transitional arrangements with the Building Safety Regulator. Who Should Pay Attention Designers and Principal Designers preparing Gateway 2 submissions for HRBs Building Control Approvers reviewing applications around the cut over date Clients with projects in planning who may benefit from transitional provisions Sources GOV.UK — Fire safety: Approved Document B (last updated 11 March 2025); Circular 01/2025 (2 March 2025); Amendment booklet effective 30 September 2026. Need Expert Fire Safety Advice? Magnus Opifex Seven LTD provides leading fire engineering, BSR Gateway 2 support, PAS 9980 appraisals, BESS fire safety, and healthcare fire strategy services across the UK. 📞 Call: +44 7486 691724 ✉️ office@magnus opifex.co.uk Request a Free Consultation →