COMPLIANCE · SCOTLAND
Automatic fire suppression is a building standards requirement for a defined list of building types under Standard 2.15. This page sets out which buildings, which design standards actually apply, and what the recent changes mean.
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WHO IT APPLIES TO
Standard 2.15 doesn’t apply to every building. It names specific categories — if yours is on the list, suppression is a statutory requirement rather than a design choice.
Buildings containing flats or maisonettes, and social housing dwellings, are named categories under the standard.
Sheltered housing complexes are named in the standard, and new developments of this type require suppression as a matter of law.
Shared multi-occupancy residential buildings are a named category. Whether a particular HMO falls inside it depends on the building — we’ll tell you straight.
Residential care buildings, school buildings and enclosed shopping centres complete the list of named building types.
THE STANDARDS
This is where most of the confusing advice circulates. Here is the position as it stands.
BSI withdrew BS 8458:2015, the code of practice for residential and domestic water mist, in July 2025.
BS EN 14972-17:2025 is now the recognised British Standard for residential water mist system design and testing.
The Scottish building standards technical handbooks name BS 8458:2015-TC for water mist design, alongside BS 8663-1:2019 for nozzles. Systems designed to it remain compliant.
You may be told water mist is no longer accepted by building control since the withdrawal. That is not what a withdrawal means, and it is not what the handbooks say.
RECENT CHANGES
Both of these have landed since the standard was last widely discussed, and both are regularly misreported.
Dispenses most loft and attic conversions, and ground-storey extensions to flats, maisonettes and social housing, from the suppression requirement, provided set fire safety conditions are met. Read the guide →
In force since 6 April 2026. Traditionally constructed buildings converted to hotel use with 15 or more rooms used for sleeping accommodation now require automatic fire suppression.
SIMON AND RICHARD’S LAW
The law is named after Simon Midgley and Richard Dyson, who died in the Cameron House Hotel fire in December 2017. It follows the Fatal Accident Inquiry into their deaths.
The formally adopted recommendation, set out in the Scottish Government’s Business and Regulatory Impact Assessment, uses the generic term “automatic fire suppression systems” — the same wording used elsewhere in Standard 2.15 — rather than mandating sprinklers specifically. The government’s own cost modelling for larger hotels does assume sprinklers as the expected route, and we would rather say that plainly than pretend otherwise.
Water mist can be proposed as an alternative where the designer satisfies the local authority verifier — the same case-by-case route that applies to care homes. If your conversion sits near the 15-room threshold, that is a conversation worth having early rather than late.
FAQ
A change to Standard 2.15 requiring automatic fire suppression in traditionally constructed buildings converted to hotel use with 15 or more rooms used for sleeping accommodation, in force since 6 April 2026.
No. It applies to conversions of traditionally constructed buildings to hotel use at 15 or more sleeping rooms. Smaller conversions may fall outside it, though other Standard 2.15 triggers could still apply.
Yes. A withdrawn standard does not invalidate systems designed to it, and the Scottish handbooks still cite BS 8458 for water mist design.
Your local authority verifier, on a case-by-case basis, where the designer makes the case. We produce the documentation that supports it.
Residential and domestic water mist systems, designed to the standard Scotland’s building standards cite.
Fitted and commissioned by qualified plumbers, backed by 19 years of frontline firefighting.
Design and consultancy for architects, builders and developers.
Tell us what you’re working with and we’ll give you a clear, written answer — including when the honest answer is that you don’t need a system at all.
