Residential Fire Strategies — An Overview

Residential buildings — from small flat conversions to large build-to-rent towers — require fire strategies at design and construction stage, and building safety case documentation once occupied. The applicable standards and the complexity of the fire strategy required vary significantly with the scale and height of the development.

The Applicable Standards for Residential Buildings

Fire strategies for new residential buildings are primarily produced against BS 9991:2015 — the British Standard for fire safety in residential buildings. BS 9991 provides specific guidance for a range of residential building types, including purpose-built flats, houses in multiple occupation, and mixed-use buildings with residential components.

Approved Document B (Volume 1 — Dwellinghouses, Volume 2 — Buildings other than dwellinghouses) also applies. For houses and simple conversions, ADB Volume 1 typically provides sufficient guidance. For larger or more complex residential developments, BS 9991 and ADB Volume 2 are both relevant.

Below 11 Metres — Simple Residential

For residential conversions and small new-build schemes below 11 metres, the fire safety requirements are relatively straightforward — primarily focused on means of escape (a protected staircase with fire doors), basic compartmentation between flats, and interconnected smoke alarms. A fire strategy may not always be required for the simplest projects, but a fire engineer's input at design stage is still advisable.

11–18 Metres — Mid-Rise Residential

Between 11 and 18 metres, the requirements increase substantially. Sprinklers are required in all new residential buildings above 11 metres. The means of escape strategy requires protected lobbies or corridors. Firefighting access must be provided. A fire strategy report is required for building control.

Over 18 Metres — Higher-Risk Buildings

For residential buildings over 18 metres (or 7 storeys), the full higher-risk building regime applies: BS 9991 requirements for firefighting lifts and firefighting shafts, non-combustible external walls, comprehensive fire detection and alarm systems, and the three-gateway Building Safety Act process. The fire strategy for a higher-risk residential building is one of the most complex and consequential documents in the development process.

Build-to-Rent (BTR) Fire Strategies

Build-to-rent developments — large-scale residential schemes with integrated amenity facilities, management presence and long-term institutional ownership — have specific characteristics that affect the fire strategy. The presence of management on site, active building monitoring and higher-specification fire safety systems can support a more tailored fire engineering approach.