If you’re an employer, landlord or property manager in England or Wales, you must provide a fire alarm system appropriate to your premises, backed by a documented fire risk assessment, under the Regulatory Reform (Fire Safety) Order 2005. The recognised technical benchmark is BS 5839-1:2025, and since the Building Safety Act 2022, you must keep that risk assessment on record in full, alongside a maintained logbook naming your competent persons.
TL;DR:
- Recording the full fire risk assessment, including methodology and responsible persons, is now mandatory for multi-occupancy buildings under the Building Safety Act 2022.
- BS 5839-1:2025 recommends about two professional fire alarm system visits annually, with a flexible five- to seven-month interval, to ensure proper maintenance.
- The fire system’s category and type, such as L1 or P1, must be based on the actual risk assessment rather than supplier stock, affecting detector placement and coverage.
- Proper interface testing of building systems like sprinklers, ventilation, and lifts is crucial, with installers required to demonstrate automatic responses before sign-off.
- Employing staff and conducting regular evacuation drills, along with accurate documentation, are essential to remain compliant and avoid enforcement penalties.
Table of Contents
- Who is legally responsible and what the law actually requires
- Which standards and guidance actually govern your system
- Choosing the right system: categories, grades and types
- Choosing a competent installer: accreditation that actually matters
- Maintenance and testing: the routine that keeps you compliant
- Enforcement, penalties and the mistakes that trigger them
- Your compliance checklist before the next audit
- How your alarm should talk to the rest of the building
- Different buildings, different fire alarm needs
- Getting audibility and visual alerting right for every occupant
- Where the rules are heading next
- Training staff so the alarm actually works when it matters
- What thorough handover looks like on a real installation
- How Smart Home Technical Ltd supports your fire alarm compliance
- Sources
- FAQ
Who is legally responsible and what the law actually requires
The Regulatory Reform (Fire Safety) Order 2005 places the legal duty on the “responsible person”: the employer, or whoever has control of the premises, such as a landlord, managing agent or occupying business. Under Article 13, that person must ensure the building has detection and alarm equipment appropriate to the risk, and Article 17 adds an ongoing duty to maintain that equipment in efficient working order. Neither article specifies a system type. That’s decided by a suitable and sufficient fire risk assessment covering the size, layout, use and occupancy of your premises.
In shared or multi-let buildings, the picture gets more complicated. A managing agent might hold responsibility for common parts while individual tenants control their own units, and gaps between the two are where enforcement problems tend to start.
Section 156 of the Building Safety Act 2022 tightened the paperwork side considerably. You now have to record the fire risk assessment in full, not just note the outcome, and where relevant, share the names and contact details of nominated competent persons with other responsible persons in the building. In practice, that means:
- Writing down the assessment methodology, findings and actions taken, not a summary
- Naming who carries out maintenance and who to contact in an emergency
- Sharing that information with other responsible persons where premises share structure or means of escape
- Reviewing and updating the record whenever the building’s use, layout or occupancy changes
Official guidance for duty holders confirms that most non-domestic premises need an electrical fire alarm system, with detectors expected wherever people might sleep and manual call points at escape routes.
Which standards and guidance actually govern your system
The law tells you what outcome to achieve. It doesn’t tell you how to wire, position or maintain a fire alarm system. That’s the job of British Standards, and specifically BS 5839-1:2025, the code of practice for fire detection and alarm systems in non-domestic buildings. It isn’t statute, so nobody can prosecute you for a clause number. But an inspector or insurer treating BS 5839-1 as the reference point for “reasonably practicable” compliance is standard practice, and deviating from it without good reason is a hard position to defend after an incident.
BS 5839-1:2025 replaced the 2017 edition and brought several changes that matter to anyone running commercial premises:
- Clarified maintenance intervals, moving towards a defined but flexible service window rather than a rigid annual date
- Tighter logbook and record-keeping expectations, including a requirement to log deviations from the standard rather than leave them as verbal notes
- Updated monitoring and alarm receiving centre transmission expectations
Standard callout: BS 5839-1:2025 recommends roughly two professional service visits a year, with a flexible five- to seven-month window between them, rather than a fixed six-month calendar date.
Approved Document B, the Building Regulations guidance on fire safety, complements this by expecting an electrically operated alarm system in most non-domestic buildings and pointing installers directly to BS 5839-1 for the technical detail on categories, cable routes and device spacing.
Choosing the right system: categories, grades and types
BS 5839-1 splits systems by purpose. Category L systems protect life, Category M is manual only (call points, no automatic detection), and Category P protects property. Within Category L, subcategories run from L1, the most extensive coverage with detectors in virtually every room and void, down to L5, a bespoke solution targeting a specific identified risk. Property protection under Category P splits into P1 (whole building) and P2 (defined areas only).
Your fire risk assessment decides which category and subcategory you need, based on occupancy type, escape routes and identified hazards, not on what a supplier happens to have in stock.
On the hardware side:
- Conventional systems wire detection zones together and are cost-effective for smaller, single-storey premises
- Addressable systems identify the exact device that triggered, which matters in larger or multi-storey buildings where minutes count
- Wireless systems suit listed buildings or premises where cabling is impractical, though they carry battery maintenance obligations conventional systems don’t
Whichever route you choose, our guide to fire alarm categories breaks down how landlords typically match category to building type.
Choosing a competent installer: accreditation that actually matters
London Fire Brigade guidance is blunt about this: there are no statutory minimum qualifications required to design or install a fire alarm system in the UK. Accreditation is how you tell a competent contractor from someone with a van and a drill.
- Check for BAFE SP203-1 certification, which is modular. Design, installation, commissioning and maintenance are certified separately, so ask which specific module covers the work you’re paying for.
- Look for NSI or SSAIB accreditation, the two main third-party certification bodies for fire and security systems in the UK.
- Confirm UKAS accreditation sits behind whichever certification body your installer uses. UKAS accredits the certifiers themselves, adding a layer of independent oversight.
- Request the paperwork at handover: a design certificate, a commissioning certificate, evidence of the engineer’s qualifications, and proof of insurance.
Pro Tip: Record the appointed competent person’s name and their certifying organisation directly in your fire safety file. Under the Building Safety Act’s recording duty, “we used a fire alarm company” isn’t a defensible answer if you’re ever asked who signed off the work.
Maintenance and testing: the routine that keeps you compliant
Article 17 of the Fire Safety Order sets an outcome duty: keep the system in efficient working order. It doesn’t dictate a testing calendar. BS 5839-1:2025 fills that gap with a recommended regime that most insurers and inspectors now expect as standard.
In-house checks are straightforward and don’t require a specialist: a weekly test of one call point (rotating around the building) and a monthly check of standby batteries and visual indicators, both logged by a named, competent staff member.
Maintenance callout: BS 5839-1:2025 recommends two professional visits a year, on a flexible five to seven month cycle, rather than a fixed six-monthly date carved in stone.
A proper professional service visit differs from an in-house check in scope. It includes proportionate functional testing across detectors and call points, a battery load test, and completion of an inspection and service certificate using the Annex G6 template in the standard. If your system reports to an alarm receiving centre, confirm your monitoring provider’s transmission times meet the standard’s clarified expectations. Reduce false alarms too: they erode both occupant response and your relationship with the fire and rescue service.
Enforcement, penalties and the mistakes that trigger them
Local fire and rescue authorities enforce the Fire Safety Order, and they can issue enforcement notices, prohibition notices, or prosecute. GOV.UK guidance for small businesses is clear that failing to follow fire safety law can result in fines or imprisonment, and penalties under the amended framework have moved firmly upward since the Building Safety Act reforms.
The failures that actually trigger enforcement are rarely exotic:
- An incomplete or outdated fire risk assessment that doesn’t reflect the current layout or use
- Gaps in the maintenance log, or no log at all
- Missing handover documentation from the original installer
- Blocked or obstructed escape routes discovered during inspection
- Repeated false alarms that suggest poor maintenance or nuisance triggering
Accredited contractors, a defensible chronological logbook, and scheduled testing address most of this. In shared buildings, coordinate with other occupiers so nobody assumes someone else is covering common-area detection.
Your compliance checklist before the next audit
- Record or update your fire risk assessment in full, naming every competent person involved, not just summarising the outcome.
- Confirm your system category against that assessment and request design and commissioning certificates from whoever installed it.
- Start a weekly and monthly in-house testing rota, book your six-monthly professional service, and check your ARC monitoring meets current transmission expectations.
- Keep a legible, chronological logbook with every remedial action logged through to closure, not left open.
Pro Tip: Photograph your logbook pages periodically and store them digitally alongside your fire risk assessment. Paper logs go missing exactly when an inspector or insurer asks to see them.
How your alarm should talk to the rest of the building
A fire alarm rarely works alone in a commercial building. Where sprinklers are fitted, the alarm system should trigger and confirm activation, giving early warning before or alongside suppression. Emergency lighting circuits typically interlock with the fire alarm panel so escape routes illuminate the moment detection triggers, and this interface needs testing as part of your routine checks, not assumed to work because it did on installation day.
Ventilation and smoke control systems present a subtler risk. Air handling units that keep running during a fire can spread smoke through ductwork rather than containing it, so most commercial systems wire the fire panel to shut down or reconfigure ventilation automatically on activation. Lift interlocks matter too: lifts should recall to a safe floor rather than continue serving upper storeys once the alarm activates, and electronic door release mechanisms on escape routes need to fail safely to unlocked, not locked, when power is lost.
None of this is exotic engineering, but it’s precisely where systems fail during real incidents, not because any single component is broken, but because nobody checked the interfaces between them at commissioning. A fire risk assessment that only considers the alarm in isolation misses the point. Ask your installer to demonstrate, not just describe, every automatic response the fire panel triggers elsewhere in the building before you sign off. If they can’t show it working, it isn’t confirmed.
Different buildings, different fire alarm needs
An open-plan office with good sightlines and simple escape routes often needs a modest Category L coverage, sometimes L2 or L3, because occupants are typically awake, mobile and familiar with the layout. Warehouses present a different challenge: large uncompartmented volumes, high storage racking that can hide smoke plumes from ceiling-mounted detectors, and often a mix of staff and visiting drivers unfamiliar with the site. Detector spacing and type (heat versus optical smoke) need careful thought against the specific stock and racking height.
Retail premises add public occupancy to the equation. Customers unfamiliar with the building’s layout need clear, audible alarms and obvious escape signage, and higher footfall periods raise the practical difficulty of a full evacuation. Healthcare premises are the most demanding category by far. Patients may not be mobile, staff need to manage phased or progressive evacuation rather than an all-out exit, and detection typically needs to extend to near-total L1 coverage given the vulnerability of the occupants and the difficulty of rapid clearance.
None of these building types has a single “correct” system prescribed by law. That’s precisely why the fire risk assessment, not a generic template, has to reflect your specific occupancy pattern, escape route geometry and evacuation capability. A warehouse fitted out like an office, or a care setting treated like a shop, is a recurring cause of inadequate coverage found during enforcement inspections.
Getting audibility and visual alerting right for every occupant
An alarm that isn’t heard, or seen, hasn’t done its job. BS 5839-1 sets audibility expectations based on ambient noise and sleeping risk, generally requiring alarm sound to reach a clear level above background noise throughout occupied areas, with higher levels specified near sleeping accommodation to overcome the reduced alertness of sleep. Device placement matters as much as volume: sounders positioned behind closed doors, inside noisy plant rooms, or at the far end of long corridors routinely fail to achieve effective coverage even when the specification on paper looks correct.
Visual alarm devices, typically strobes or beacons, are essential wherever staff or visitors may have hearing impairments, and their placement needs the same rigour as sounders: within sightline of workstations, meeting rooms and toilets, not just corridors and stairwells. Accessibility here isn’t an optional extra bolted onto a standard system. It’s part of what “appropriate” coverage means under the fire risk assessment duty, particularly in premises open to the public or employing staff with disabilities.
Get your installer to walk the building with you after commissioning and confirm, room by room, that alarm sound and visual alerting actually reach every occupied space, including areas added or repurposed since the original design. A commissioning certificate that predates a fit-out change is a common and avoidable compliance gap.
Where the rules are heading next
BS 5839-1:2025 is the most significant update to hit commercial fire alarm compliance in years, and it’s still working through the industry. Expect installers and maintenance contractors to reference it as the default specification on new contracts from now on, and expect insurers to start asking whether your existing system and logbook meet its clarified logging and monitoring expectations, even where the underlying hardware hasn’t changed.
The direction of travel from the Fire Safety Order 2005 through the Fire Safety (England) Regulations 2022 and the Building Safety Act 2022 has been consistently towards more documentation, not less, and towards holding responsible persons personally accountable for gaps in that paperwork. If you’re a business owner who hasn’t touched your fire risk assessment since before 2022, that’s the first thing to revisit, because the recording standard it was written to has since changed.
Training staff so the alarm actually works when it matters
A compliant system with untrained staff is only half the job. Employees need to know what the alarm sounds like, where their nearest escape route is, and where to assemble once outside, and this needs refreshing periodically, not covered once at induction and forgotten.
Fire wardens or marshals, formally appointed and trained, should know how to conduct a sweep of their area, assist anyone needing help evacuating, and report to the responsible person or fire service on arrival. Evacuation drills, run at a sensible frequency for your occupancy type, are the only reliable way to find out whether your evacuation plan actually works in practice rather than on paper. Record every drill, including timings and any problems identified, in your fire safety file alongside your logbook. That record becomes evidence of an actively managed safety culture, not just a document filed and ignored.
What thorough handover looks like on a real installation
Deviations from BS 5839-1:2025 aren’t automatically wrong, but they need justifying, recording in the logbook, and signing off at handover rather than left unexplained. A proper handover includes the commissioning certificate, full system drawings, a labelled panel showing every zone, and hands-on training for whoever will operate the panel day to day. Before sign-off, check integrations, door releases, lift interlocks, smoke control, actually respond to the panel, not just appear correct on the drawing.
— Simon
How Smart Home Technical Ltd supports your fire alarm compliance
Getting your fire alarm system right shouldn’t mean chasing three separate contractors for design, installation and ongoing maintenance. Smarthometechnical handles fire alarm installation for commercial and residential premises across Dorset, Hampshire and Devon as part of a wider electrical contracting service, so your commissioning certificate, handover documentation and future maintenance visits all come from the same accountable source rather than getting lost between suppliers.
When you request a quote, ask specifically for accreditation evidence, a commissioning certificate, and a written maintenance schedule before you sign anything, that’s the paperwork that protects you if an inspector ever asks who’s responsible for your system’s upkeep. If you’d rather not manage testing dates yourself, the Solar & Battery Service & Maintenance Plan at £175 per year shows the kind of structured, scheduled approach Smarthometechnical applies to ongoing property maintenance more broadly. Book a site survey to get your fire risk assessment and system category checked properly, and request references so you can compare written certificates before you commit.
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.
Sources
- Legislation
- Fire safety responsibilities under Section 156 of the Building Safety Act 2022 (gov.uk PDF)
- BS 5839-1:2025 fire alarm standard updates (IQ Fire Solutions)
- Gov
FAQ
What are the new fire alarm regulations in the UK?
The most significant recent change is the Building Safety Act 2022, which requires responsible persons to record their fire risk assessment in full rather than just noting the outcome, and to share competent person details in multi-occupied buildings. Alongside that, BS 5839-1:2025 updated the technical standard governing design, maintenance intervals and logbook detail.
Is BS 5839-1 a legal requirement?
No, BS 5839-1 is a British Standard, not statute, so there’s no direct legal penalty for a specific clause breach. In practice, though, it’s treated as the recognised benchmark for meeting your statutory duty under the Regulatory Reform (Fire Safety) Order 2005, and departing from it without justification is hard to defend after an incident.
What is the standard code for fire alarms in the UK?
BS 5839-1:2025 is the current code of practice for fire detection and alarm systems in non-domestic premises, covering design, installation, commissioning and maintenance. Approved Document B, the Building Regulations fire safety guidance, cross-references BS 5839-1 for the technical detail behind its requirements.
What are the key changes in the new fire safety regulations for 2026?
Businesses are still adjusting to BS 5839-1:2025’s tightened logbook requirements, clarified service intervals (roughly two visits a year on a flexible five to seven month window), and updated monitoring expectations for alarm receiving centres. Combined with the Building Safety Act’s full-record duty, the overall direction is towards stronger documentation and clearer accountability for named competent persons.
Do I need a professionally maintained fire alarm system for my business?
Yes, if you employ staff or operate premises open to the public, you’re the responsible person under the Fire Safety Order and must maintain your fire alarm system in efficient working order. Smarthometechnical can carry out installation, commissioning and scheduled maintenance visits as part of its electrical contracting services across Dorset, Hampshire and Devon.
