What You Need To Know About The Latest BS 9991:2024 Regulations.

BS 9991 provides key guidance on fire safety design for residential buildings in the UK. First published in 2011 by the British Standards Institution, the standard replaced earlier fire safety codes such as BS 5588-1, which had shaped residential fire safety design for several decades.

It was most recently revised in November 2024. The latest iteration (BS 9991:2024) represents a major update to fire safety guidance for residential buildings, reflecting changes in regulation, evolving building technologies, and lessons learned from major fire safety incidents.

We have more than 35 years of unrivalled excellence in construction to our name here at RG Group, so if you’re looking for a quick expert roundup of the latest changes, here’s what you need to know.

What Is BS 9991?

BS 9991 – Fire Safety in the Design, Management and Use of Residential Buildings – is the British Standard that sets out fire safety guidance for flats, apartment blocks and other housing developments.

It establishes a best-practice framework that applies across a range of properties, including:

• Dwellings and blocks of flats
• Student accommodation and residential care accommodation
• Specialised housing
• Care homes

The standard outlines strategies for fire prevention, detection, evacuation, and control, ensuring the safety of residents while supporting compliance for building owners and managers. It is designed for use at all stages of a building’s lifecycle, from initial concept design through in-use management and extensions.

BS 9991 complements BS 9999:2017 (“Fire Safety in the Design, Management and Use of Buildings”), providing more holistic guidance for larger or more complex projects. It also clarifies expectations for high-risk occupancies and encourages integrating fire safety measures early in the design process, reducing the need for costly retrofits later.

What’s The Difference Between BS 9991 and Approved Document B

BS 9991 is a flexible standard that details tailored fire-safety solutions for different types of residential properties, allowing room for innovation and alternative approaches to maximise safety.

Approved Document B, on the other hand, is official government guidance used to demonstrate compliance with the fire safety requirements of the Building Regulations 2010. It provides a prescriptive route that designers can follow to show that a building meets those regulatory requirements.

In simple terms:

• Approved Document B provides a commonly used compliance pathway.
• BS 9991 demonstrates an alternative approach to meeting those requirements.
• BS 9991 often goes further by addressing complex layouts and higher-risk occupancies.

While BS 9991 is frequently referenced alongside Approved Document B, it provides additional depth, particularly around lifecycle management and integrated fire safety strategies.

Why Has It Changed?

At the end of 2024, an updated version of BS 9991 was published, replacing the 2015 edition. Key updates came into effect in November 2024, marking a significant shift in fire safety standards for residential buildings.

The revisions were introduced to reflect:

• Evolving fire safety challenges
• Technological advancements
• Lessons learned from the Grenfell Phase 2 Report

The updated guidance introduces clearer performance benchmarks and clarifies responsibilities for building owners, designers, and managers. It also strengthens direction for buildings with complex layouts, higher occupancy levels, and vulnerable residents.

What Are The New Changes?

Many of the changes in BS 9991:2024 refine or clarify previous guidance, though some earlier provisions have been removed. The new version places stronger emphasis on integrating fire safety at the earliest stages of design.

Below is a summary of some of the most significant updates:

• Some smoke control provisions have moved from “informative” to “normative,” making them mandatory where applicable.
• Additional measures are required for taller buildings over 30 storeys, including enhanced firefighter access and protected entry points.
• Updated guidance covers automatic opening vents, natural smoke shafts, and mechanical smoke shafts.
• All buildings with passenger lifts must now include at least one evacuation lift per stairway, with appropriately sized evacuation lobbies.
• Smoke control systems must respond automatically to alarm inputs, with manual overrides restricted to specific cases such as firefighter intervention.
• Revised height thresholds now make sprinkler systems mandatory above certain building heights. References to alternative systems such as water-mist have been removed.
• Single-stairway buildings are subject to new height limits, and buildings with a storey above 18 metres must include at least two staircases.
• Flat layout guidance has been revised, including updated expectations for lobbies, hallways, ancillary spaces, and kitchens. A minimum separation distance between the hob and escape route now replaces the former unenclosed-kitchen rule.
• The scope explicitly includes residential care homes, with tailored provisions for vulnerable occupants.
• Personal Emergency Evacuation Plans (PEEPs) must be developed by a designated responsible person and tailored to individuals who may struggle to evacuate independently.
• Fire strategies for specialised housing and care buildings must reflect realistic in-use management conditions.
• Reaction-to-fire classifications for structural elements have been strengthened, with mandatory European classification under BS EN 13501.
• Fire door standards now reference European fire-resistance classifications instead of previous national standards.
• The standard applies only to buildings up to 100 metres in height.
• Older ADB editions remain valid for submissions made before 2 March 2025, where work commenced within six months.
• References to outdated national fire-testing standards such as BS 476 have been removed.
• Escape routes, staircases, firefighting access, annexes, and guidance notes have all been updated to reflect 2025 amendments.

RG Group Ensures BS 9991:2024 Compliance

Navigating BS 9991:2024 requires detailed understanding and careful application across residential projects. RG Group combines technical expertise, practical experience, and compliance management to ensure buildings meet updated fire safety standards from concept through to occupation.

Our team integrates smoke control systems, evacuation strategies, and structural safety measures with diligence and efficiency. Whether you are a developer, operator, or investor, we deliver residential buildings that are safe, compliant, and built to last.

To explore how we can support your next project, please contact us.