Under BS 5839-1:2025, a commercial fire alarm needs a weekly manual call point test by the responsible person, and a service inspection at least every six months by a competent contractor. The two service visits together must cover the whole system across a year. Sensitivity testing follows a one to five year cycle depending on detector type. BS 5839-1:2025 came into force on 30 April 2025 and withdrew the 2017 edition.
Key takeaways
- BS 5839-1:2025 replaced the 2017 edition on 30 April 2025. Guidance citing only the 2017 version is out of date.
- Weekly call point test by you; six-monthly service by a competent contractor, with a 5 to 7 month scheduling window now permitted.
- Look for BAFE SP203-1 registration. NICEIC and ECA are electrical approvals and do not evidence fire alarm competence.
- Your system category (L1 to L5, P1, P2, M) is set by the fire risk assessment and defines what coverage must be maintained.
- Non-compliance carries unlimited fines, up to two years imprisonment, and personal liability for directors under Article 32.
If you own, manage, or occupy a commercial building in the UK, some part of the fire alarm testing rota is your responsibility. The bit most people ask about, “how often should the alarm actually be tested”, is set out clearly in BS 5839, the British Standard for fire detection and alarm systems.
Note the version. BS 5839-1:2025 came into force on 30 April 2025 and withdrew the 2017 edition. Anything you read that only cites BS 5839-1 without a year, or cites the 2017 edition, is out of date on some of the detail. Below is a plain-English summary of what the current standard requires for a typical commercial premises, and where the boundaries between the “responsible person” (you) and the servicing contractor (us) actually sit.
Who is legally responsible for fire alarm testing?
Under the Regulatory Reform (Fire Safety) Order 2005, every non-domestic premises has a “responsible person”. For an owner-occupied business, that’s usually you as the business owner. For a rented commercial premises, responsibilities are split between the landlord and the tenant, and the exact split depends on the lease.
Since Section 156 of the Building Safety Act 2022 came into force on 1 October 2023, the responsible person also has to record the fire risk assessment and fire safety arrangements in writing (regardless of premises size, where previously it was only required above five employees), and cooperate with other responsible persons who share the building.
The responsible person does not have to test the alarm themselves. They do have to make sure it is tested to the correct schedule and that records are kept.
Which category of fire alarm system do you need?
Not every system does the same job. The category of your fire alarm is set during the fire risk assessment and drives the design. In outline:
- L1: automatic detection throughout, protection of life; the highest life-safety category
- L2: detection in escape routes plus high-risk areas
- L3: detection in escape routes plus adjoining rooms
- L4: detection in escape routes only
- L5: detection where a specific risk is identified
- P1 / P2: property protection categories, driven by insurer requirement
- M: manual system only (call points and sounders, no automatic detection)
Knowing your category matters because it defines what coverage the servicing contractor is expected to maintain. If detectors have been added, moved, or removed over time, the “as-installed” state may no longer match the design intent, and the fire risk assessment should be updated.
How often must a fire alarm be tested?
1. Weekly test (responsible person)
BS 5839-1 requires a weekly test of at least one manual call point (a “break glass”) on the system. The idea is:
- To confirm the alarm sounders still activate
- To confirm the panel receives the signal
- To familiarise staff with what a real alarm sounds like
- To rotate through the call points, so every one gets tested at least once a year
The test is quick, five minutes or less. The result gets logged in the fire logbook, along with the call point number and the person who tested. Most businesses do this on the same day and time each week to make it habitual.
2. Six-monthly service inspection (competent contractor)
BS 5839-1:2025 requires servicing at intervals of no more than six months, and now expressly permits a scheduling window of 5 to 7 months to make planning easier. Over the course of a year, the two visits should cover the whole system in detail: all detectors, call points, sounders, panel functions.
Typical activities on a six-monthly visit:
- Battery and standby supply check
- Panel event log review
- Physical inspection and functional test of a sample of detectors and call points
- Sounder audibility check
- Interface and cause-and-effect verification
- Confirmation that the logbook is being maintained
3. Annual coverage (competent contractor)
Rather than a separate third visit, “annual” testing is the completion of full system coverage across the two six-monthly visits. Some contractors organise this as a “big” visit and a “small” visit; either is fine as long as the year’s coverage is documented.
4. Sensitivity testing (competent contractor)
Depending on the type of detector, sensitivity testing is required every one to five years. Modern addressable panels self-report detector sensitivity, so this often happens automatically. Older conventional panels need it done manually with test equipment.
| Task | Frequency | Carried out by | Recorded in |
|---|---|---|---|
| Manual call point test | Weekly | Responsible person | Fire logbook |
| Service inspection | Every 6 months (5 to 7 month window) | Competent contractor | Service certificate |
| Full system coverage | Annually, across both visits | Competent contractor | Service certificate |
| Detector sensitivity test | Every 1 to 5 years by type | Competent contractor | Service certificate |
| Standby battery replacement | Every 3 to 5 years | Competent contractor | Service certificate |
Intervals per BS 5839-1:2025 for non-domestic premises. Domestic premises follow BS 5839-6:2019+A1:2020, which sets no statutory testing schedule for owner-occupiers.
What makes a fire alarm contractor competent?
“Competent” has a specific meaning here. Look for one or more of these third-party marks on the contractor’s paperwork:
- BAFE SP203-1: the primary industry scheme for the design, installation, commissioning, and maintenance of fire detection and alarm systems. If you’re procuring for a larger commercial site, BAFE SP203-1 is what tender teams filter on.
- FIA membership: Fire Industry Association trade body membership
- LPS 1014 or NSI Gold: alternative third-party fire certification schemes
An important note for buyers: NICEIC and ECA are electrical approvals. They evidence that the contractor is competent to install and test electrical wiring. They do not, on their own, evidence competence to design or service fire detection and alarm systems. A contractor who does both should carry both sets of accreditations.
What are the rules for domestic smoke alarms?
The rules are different for domestic properties. BS 5839-6:2019+A1:2020 covers domestic premises. Detector grades run from Grade A (a full commercial-spec system) down to Grade F (a single battery-operated smoke alarm). Most homes need Grade D2 (mains-powered with battery backup, interconnected, minimum specification).
There is no legally required schedule for the homeowner to follow. Common-sense guidance:
- Press-to-test every smoke alarm monthly
- Replace mains-powered smoke alarms every 10 years, whether they still work or not (the sensor degrades faster than the housing)
- Replace battery smoke alarms according to the manufacturer’s stated life
For rented residential properties, the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 apply. Landlords must ensure alarms are working at the start of every new tenancy, and a CO alarm is required in any room used as living accommodation with a fixed combustion appliance (excluding gas cookers). A “repair on report” duty also applies: alarms must be repaired or replaced once the landlord is told they are faulty. The 2022 amendment extended the scheme to social housing landlords.
What problems turn up most on a fire alarm service?
The most common issues on a commercial fire alarm service:
- The logbook is empty. Someone bought a nice black book, put it next to the panel, and nobody ever wrote in it. This is a common failing point in a fire risk assessment.
- Sounders muted “temporarily”. A false alarm at 3am led someone to silence a section of the alarm, and nobody switched it back.
- Detectors covered. A refurb went in, contractors covered detectors to keep dust out, and never uncovered them.
- Batteries out of date. Panel standby batteries are usually rated for 3 to 5 years. Beyond that they may not deliver the required standby duration on a mains failure.
- Wireless devices with dead cells. Wireless call points and detectors have a limited battery life. If they haven’t been serviced in years, some may already be silent.
What should a fire alarm logbook contain?
- System details: category, panel type, date of commissioning, servicing contractor contact
- Weekly test records: date, call point tested, person testing, result
- Service visit records: date, contractor, activities carried out, engineer signature
- Faults and events: any fire, false alarm, or fault event
- False alarm log: cause analysis where known, to support false-alarm reduction under BS 5839-1
What are the penalties for fire alarm non-compliance?
Under the Regulatory Reform (Fire Safety) Order 2005, non-compliance can be enforced by the fire and rescue authority with an enforcement notice, a prohibition notice, or prosecution. Sanctions include:
- Unlimited fines
- Imprisonment of up to two years for the most serious offences
- Under Sentencing Council guidelines (aligned to turnover since 2016), fines for large-turnover businesses can reach millions
- Personal liability for directors and managers under Article 32 of the RRO
- Insurance void risk on a fire claim if the alarm is out of service
What we do
Nulectrics carries out commercial fire alarm servicing to BS 5839-1:2025 across the UK, based in Chippenham, Wiltshire. We service systems we installed and systems installed by other contractors, and we can bring a neglected system back into a maintained state without ripping it out.
See our commercial fire and security page for the fuller scope, or contact us to arrange a BS 5839-1 service visit.
Related guides: commercial rewire timeline, bundling electrical, mechanical and fire work, and our commercial electrical service.
Service areas: Nulectrics is based in Chippenham, Wiltshire. We cover domestic work across Chippenham, Corsham, Calne, Melksham, Devizes, Trowbridge, Bath and the surrounding area, and commercial work UK-Nationwide.