How often should a
fire alarm be serviced
in the UK?
The short answer is at least every six months — but the full picture is more nuanced. Everything a business owner or facilities manager needs to know, explained by a fire engineer.
A fire alarm system that is not regularly tested and maintained is a system you simply cannot rely on. BS 5839-1 sets out clear, structured requirements for how often checks should take place — and the law requires that you follow them.
The Required Servicing Schedule at a Glance
BS 5839-1 specifies a layered programme of testing and maintenance. Responsibilities fall on both the building’s Responsible Person and a competent servicing contractor. For the full detail of what each visit must cover, see our dedicated testing and maintenance hub.
Weekly — manual call point test
The Responsible Person — or a nominated member of staff — must test at least one manual call point every week, rotating through all devices over time. The result must be recorded in the fire alarm log book. See our step-by-step weekly test guide for the correct procedure. This is an in-house task — no contractor is needed.
Monthly — visual inspection (selected premises)
For certain high-risk or high-occupancy premises — such as high-rise residential buildings under the Fire Safety (England) Regulations 2022 — a monthly check of the fire alarm panel is required. For most standard commercial premises this is good practice rather than a mandatory requirement.
Six-monthly — full service by a competent person
The minimum mandatory servicing frequency for virtually all non-domestic premises. A competent engineer — ideally from a BAFE SP203-1 accredited company — must carry out a thorough inspection and functional test of the entire system, including every detector, sounder, call point, and interface. See our servicing checklist for what each visit must cover.
Annual — full inspection to Clause 45
At least one of the two six-monthly visits should constitute a full annual inspection as described in Clause 45 of BS 5839-1. The engineer produces a formal written report confirming the system remains appropriate for the building as it currently exists and recording the results in the fire alarm log book.
Is six-monthly servicing a legal requirement?
BS 5839-1 is a British Standard rather than law, but the Regulatory Reform (Fire Safety) Order 2005 requires the Responsible Person to ensure that fire detection equipment is maintained in efficient working order. Six-monthly servicing by a competent person is the accepted way of demonstrating compliance with this duty. If an incident occurs and your records show anything less, it will be very difficult to defend your position. See our guide to fire alarm legal requirements for the full enforcement picture.
What is involved
What Does a Fire Alarm Service Actually Cover?
A proper six-monthly service is far more thorough than simply pressing a few test buttons. A competent engineer should carry out all of the following at each visit. For the complete checklist of what BS 5839-1 requires at each visit, see our servicing checklist.
| Activity | Detail |
|---|---|
| Full device testing | Functional test of every automatic detector, every manual call point, every sounder, and every visual alarm device — 100% coverage across the 12-month period |
| Control panel inspection | All indicators, cause and effect logic, zone display, and fault monitoring checked and tested |
| Battery and power supply test | Standby capacity confirmed as adequate — see our guide to power supply requirements for what the standard requires |
| Interface testing | Door release mechanisms, suppression system connections, lift recall, and ventilation control all checked |
| Visual inspection | All cabling, fixings, detector heads, and equipment enclosures checked for damage or deterioration |
| Fault log review | Panel fault log examined and any outstanding faults investigated |
| Written service report | Detailed report listing every device tested, results, deficiencies noted, and recommended remedial works |
| Log book update | Service certificate completed and fire alarm log book updated |
Beware of cut-price servicing
A fire alarm service that takes 30 minutes for a large premises is almost certainly not compliant. Testing every device individually takes time — a thorough service of a medium-sized commercial premises will typically take several hours. If your service visit is suspiciously quick, ask your contractor exactly which devices were tested and request the detailed service report as evidence. Our guide to what a maintenance contract should include covers what you should be getting and how to spot when you’re not.
Domestic premises
What About Fire Alarms in Homes and Flats?
The servicing requirements for domestic premises are governed by BS 5839-6, and the frequency of professional maintenance depends largely on the grade of system installed.
| System grade | Premises type | Servicing requirement |
|---|---|---|
| Grade D / F | Most private homes | No professional servicing required — weekly self-test by householder, annual battery replacement |
| Grade A / B / C | Larger HMOs, sheltered housing | Professional servicing at least annually, ideally every six months |
| Common areas — blocks of flats | Non-domestic premises under the RRO | Six-monthly servicing to BS 5839-1 as a minimum |
Record keeping
The Fire Alarm Log Book
Maintaining accurate records is not optional — it is a requirement of both BS 5839-1 and the RRO. A fire alarm log book must be kept on the premises at all times and must contain:
Weekly test entries
Date, which call point was tested, result, and the name of the tester — every week without exception. Use our free weekly test log template to keep records in the correct format.
Fault reports and resolution
Any fault identified during a test or at any other time, and a record of when and how it was resolved.
Service certificates
The written certificate from every six-monthly service visit, plus the detailed service report.
Installation and commissioning certificate
The original certificate issued when the system was first installed and commissioned.
False alarm records
A log of any unwanted alarm activations, including the cause where identified.
Choosing a contractor
Who Should Service Your Fire Alarm?
BS 5839-1 recommends that servicing is carried out by a company holding third-party certification from a UKAS-accredited certification body. For a full explanation of what competence means and how to verify it, see our guide to who can service a fire alarm.
| Certification | What it means | Why it matters |
|---|---|---|
| BAFE SP203-1 | Third-party accreditation covering design, installation, commissioning, and maintenance of fire alarm systems | Gives the Responsible Person documented assurance that work has been independently assessed against BS 5839-1 |
| NSI Gold / Silver | National Security Inspectorate accreditation, widely recognised by insurers and enforcing authorities | Demonstrates a high standard of technical competence and quality management |
| SSAIB | Security Systems and Alarms Inspection Board certification | Another recognised route to demonstrating third-party assessed competence |
Further reading
- Fire alarm testing and maintenance hub
- Fire alarm maintenance frequency — factors affecting the required schedule
- Fire alarm servicing checklist — what each visit must cover
- Who can service a fire alarm?
- Fire alarm log book requirements
- Fire alarm maintenance contract costs
- Fire alarm maintenance contract explained
- Weekly fire alarm test procedure
- Understanding BS 5839
- Fire alarm legal requirements for UK businesses