What is Approved Document B?
Approved Document B is part of the statutory guidance that helps building professionals in England meet the requirements of the Building Regulations. It covers fire safety in both dwellings and non-dwelling buildings and is regularly updated in line with emerging risks and policy changes.
What’s new in the 2025 update?
The Ministry of Housing, Communities, and Local Government has published a new version of Approved Document B. This edition builds on the 2019 version and incorporates changes from 2020, 2022, and a series of phased amendments due in 2025, 2026 and 2029.
Key 2025 changes include:
- Mandatory sprinkler systems in all care homes
- Limits on compartment sizes within care homes
- Initial withdrawal of national fire performance classifications for reaction to fire and roof coverings
Future changes to be aware of
The phased updates continue beyond 2025:
2026 amendments:
- All new residential buildings over 18 m must include at least two separate escape routes
2029 amendments:
- Complete removal of national fire classification standards, finalising the transition that begins in 2025
Improved document accessibility
To aid clarity, all amendments are colour-coded in the new version of the document — making it easier for readers to identify what’s new and when it comes into effect.
Need help interpreting the changes?
We help clients understand and apply fire safety regulations. From care home design reviews to building project support, our consultants can guide you through compliance. Speak to us to learn more.