BSI launches new water mist fire standard for residential buildings
Iain Hoey
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UK adopts EN 14972-17 for domestic water mist systems
BSI has published a new standard for fire protection in residential buildings, replacing the existing British Standard BS 8458.
According to the Fire Protection Association (FPA), BS EN 14972-17:2025 was released on 7 July 2025 and is now the recognised UK testing protocol for water mist systems in homes and domestic settings.
The new publication forms part of the broader EN 14972 series for water mist systems and provides guidance for ceiling heights up to 5.5 metres.
The FPA confirmed that the previous standard, BS 8458:2015, has been withdrawn and is no longer in effect.
EN 14972-17 includes detailed fire test protocols for various domestic applications including family dwellings, care homes, hostels, and apartments.
Updated European standard forms part of wider EN 14972 series
BS EN 14972-17:2025 has been adopted from a European-wide set of testing protocols under the EN 14972 framework, managed by the European Committee for Standardisation (CEN).
The standard was developed by CEN Technical Committee 191, whose secretariat is held by BSI.
It must be adopted as a national standard by January 2026 and all conflicting national standards must be withdrawn by the same date.
EN 14972-17 is one of 17 published or in-development parts covering fire testing methods for a range of building types, equipment enclosures and specific use cases.
The standard outlines technical requirements including fuel packages, ignition methods, test setups and pass/fail criteria for systems installed in residential buildings.
Residential use cases covered under the new testing protocol
BS EN 14972-17:2025 applies to water mist systems installed in residential occupancies up to a ceiling height of 5.5 metres.
The document lists examples of qualifying settings including apartment buildings, blocks of flats, care homes, and bed and breakfasts.
It also applies to hotel bedrooms, guest corridors, and other small-scale residential areas.
Each application is subject to a defined set of testing conditions and fire load configurations, based on system design.
Countries may append additional annexes specifying minimum design areas, building height limits or system adaptations.
Legal and contractual guidance for UK users
BSI issued a national foreword to accompany the standard, confirming its status as the UK implementation of EN 14972-17:2025.
The British version was published under the authority of the Standards Policy and Strategy Committee on 31 July 2025.
The UK’s participation in the drafting process was managed by Technical Committee FSH/18/5 on water mist systems.
BSI stated that the publication does not constitute legal advice and that users should seek professional guidance when applying the standard.
The document notes that compliance with British Standards does not offer immunity from legal responsibilities.
Next steps for UK water mist stakeholders
The Fire Protection Association said it will provide further updates and technical guidance to support implementation of BS EN 14972-17:2025.
As a recognised test house for water mist systems, the FPA confirmed its intention to help industry prepare for the transition from BS 8458.
The organisation has not yet released a detailed timeline for support materials or testing availability under the new regime.
Installers, designers, and certification bodies are advised to begin reviewing the updated protocol in preparation for full adoption.
The EN 14972 series and its annexes are available through the BSI website and other national standards bodies.
BSI launches new water mist fire standard for residential buildings: Summary
BSI has released BS EN 14972-17:2025 as the new UK standard for residential water mist systems.
The new standard replaces BS 8458:2015, which was withdrawn on 7 July 2025.
The standard forms part of the wider EN 14972 series, covering 17 application areas for water mist systems.
BS EN 14972-17:2025 specifies fire testing protocols for domestic and residential buildings up to 5.5 metres in ceiling height.
Use cases include homes, flats, care homes, hotels, and hostels.
The standard was developed by CEN Technical Committee 191.
It must be implemented nationally by January 2026.
BSI published the UK version under its policy committee on 31 July 2025.
Users are advised that the standard does not remove legal obligations.
The Fire Protection Association will issue further technical guidance.