Approved Document B (Fire Safety) Amendment: Second staircases in new blocks of flats over 18m

Approved Document B (Fire Safety) Amendment: Second staircases in new blocks of flats over 18m. Published 29 March 2024, these amendments to Approved Document B introduce a recommendation for a second staircase in new residential buildings in England with a storey 18m or more in height, effective from 30 September 2026. This post-Grenfell guidance aligns with the Building Safety Act 2022, enhancing means of escape for future higher-risk buildings. This page provides a structured summary, key provisions, and practical guidance on the application of Approved Document B Second Staircase Amendment to UK fire safety engineering, building design, and Building Safety Act compliance.