False alarms — increasingly known as unwanted fire signals (UwFS) — are the single largest source of demand on UK fire and rescue services, outnumbering genuine fires by a wide margin. They tie up appliances and crews, cost the economy hundreds of millions of pounds a year, disrupt businesses and, over time, erode confidence in fire alarm systems. This guide brings together the latest verified data from the Ministry of Housing, Communities & Local Government (MHCLG), Gov.UK and fire and rescue services, covering the scale of the problem, why false alarms happen, the legal duty on businesses and the shift towards non-attendance policies.
Key facts and figures
- 250,226 fire false alarms were attended by fire and rescue services in England in 2024/25 — around 42% of all incidents.
- 176,262 of those were triggered by automatic fire detection (AFD) systems — roughly 70% of all false alarms.
- £1 billion+ is the estimated annual cost of false alarms to the UK economy.
- 700,000+ false alarms were handled by UK fire services over the most recent five-year period.
- 52,000 unwanted alarms were attended by London Fire Brigade alone in 2023/24.
- Under 1% of London's automatic alarm calls turned out to be a genuine fire.
False alarms: the UK's largest fire service demand
Unwanted fire signals now make up the biggest single category of incidents attended by fire and rescue services. In the year ending June 2024, around 43% of all incidents attended by services in England were false alarms — more than the number of actual fires. Every one of those mobilisations commits crews and appliances that are then unavailable for genuine emergencies.
The trend is upward. Dwelling-based apparatus false alarms have risen by roughly 35% since 2015, with a further 27% increase since 2022. As more buildings are fitted with automatic detection and as communications networks change, the volume of unwanted signals has continued to climb rather than fall.
What is a false alarm?
A false alarm is any activation of a fire alarm or detection system where no fire is actually present. Fire and rescue services group them into three main categories:
- Apparatus (system-triggered): activations from automatic systems responding to cooking fumes, steam, dust, heat or a system fault. This is by far the largest category.
- Good intent: situations where someone genuinely believed there was a fire and called for help, but no fire was present.
- Malicious: deliberate activations. More than 3,000 malicious manual call point activations were recorded between September 2023 and March 2024.
The scale of the problem
In 2024/25, fire and rescue services in England attended 250,226 fire false alarms — around 42% of all incidents. Of these, 176,262 (roughly 70%) were caused by automatic fire detection systems rather than people raising the alarm.
The picture is starkest in major cities. London Fire Brigade attended around 52,000 unwanted alarms in 2023/24, and fewer than 1% of its automatic alarm calls proved to be an actual fire. Across the UK, services handled more than 700,000 false alarms over five years — a sustained drain on resources that has driven the recent change in attendance policies.
| Measure (England / UK, latest data) | Figure |
|---|---|
| Fire false alarms attended (England, 2024/25) | 250,226 |
| Share of all FRS incidents | ~42% |
| Caused by automatic fire detection (AFD) | 176,262 (~70%) |
| London Fire Brigade unwanted alarms (2023/24) | ~52,000 |
| London AFD calls that were genuine fires | under 1% |
| Estimated annual cost to the UK | £1 billion+ |
Why false alarms happen
Most false alarms are not faults in the strict sense — they are detectors doing exactly what they were designed to do, in the wrong circumstances. The most common causes are:
- Cooking fumes — the predominant trigger in dwellings and a frequent cause in commercial kitchens.
- Steam from bathrooms, showers and kitchen areas.
- Dust from building and refurbishment works.
- Poor maintenance and system faults, where detectors are not cleaned, tested or serviced.
- Poor system design or detector placement, such as smoke detectors sited too close to kitchens or bathrooms.
- Communications changes, including the transition from the old PSTN telephone network to IP-based connections, which can disrupt how alarm signals are transmitted.
The legal consequences of persistent false alarms
Under the Regulatory Reform (Fire Safety) Order 2005, Article 17 requires the responsible person to keep fire safety equipment — including the fire alarm system — in "efficient working order and in good repair." A system that repeatedly produces unwanted signals can amount to a breach of that duty.
Where false alarms persist, fire and rescue services can take a range of action: issuing enforcement notices, serving prohibition notices, charging for repeated callouts, or — in serious cases — prosecuting the responsible person. Managing false alarms is therefore not just a courtesy to the fire service; it is part of complying with the law.
Non-attendance policies: the industry response
To stem the tide of unwanted signals, several services have moved away from automatically attending automatic fire alarm calls from commercial premises. From October 2024, London Fire Brigade stopped automatically mobilising to commercial automatic fire alarms unless a fire is confirmed — for example by a 999 call or visible signs of fire. Services in Scotland, Northern Ireland and Wales have introduced similar non-attendance arrangements.
The practical effect is that an automatic alarm alone may no longer bring a fire engine. Premises are expected to investigate the cause first and call 999 only when a fire is confirmed, which places more responsibility on trained staff on site to respond correctly.
What businesses should do
Reducing false alarms protects fire service resources, avoids potential callout charges and keeps your alarm system credible so that people respond when it really matters. Practical steps include:
- Maintain and service the alarm system regularly, keeping detectors clean and tested.
- Review detector siting — move or change detector types near kitchens, bathrooms and dusty areas.
- Manage hot works, cooking and refurbishment with temporary protection or isolation where appropriate.
- Investigate and record every activation to identify recurring causes.
- Train staff and fire wardens to investigate activations, follow the evacuation plan and call 999 only when a fire is confirmed.
With many services no longer attending automatically, competent, trained staff on site are more important than ever. A short course ensures your fire wardens know how to respond to an activation, reduce unwanted signals and act decisively in a genuine emergency.
Sources & references
- Ministry of Housing, Communities & Local Government (MHCLG) — Fire and Rescue Incident Statistics, England (year ending March 2025)
- MHCLG — Detailed Analysis of Fires Attended by Fire and Rescue Services, England (April 2024 to March 2025)
- Gov.UK — Trends in fire false alarms data and documentation
- London Fire Brigade — unwanted fire signals and automatic fire alarm attendance policy
- Gov.uk — Fire and rescue incident statistics, year ending March 2025
- Gov.uk — Detailed analysis of fires, England, April 2024 to March 2025
- Gov.uk — Trends in fire false alarms and fire false alarm policies
- The Fire Safety Event — False fire alarms continue to present a threat in the UK
- Zurich Resilience Solutions — UK changes to fire and rescue services attendance policies
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Mark writes about workplace fire safety, compliance and accredited training for Fire Marshal Training, part of Online CPD Academy.