Most business owners assume someone else is dealing with it. The landlord. The facilities manager. The bloke who came round three years ago and stuck a sticker on the side.
Then the fire risk assessment happens, and the report comes back with a critical finding: extinguishers not serviced in accordance with BS 5306. Suddenly it is everyone’s problem.
This post answers the questions we get asked most often about fire extinguisher servicing.
Not the watered-down version. The full picture, including what the British Standards actually require, what your insurer expects, and what happens when businesses get it wrong.
Do fire extinguishers actually work? The evidence says yes
Before we get into the rules, it is worth answering the question some business owners quietly wonder: are these things on the wall actually worth maintaining, or are they just there to keep the inspector happy?
The evidence is firmly on the side of the extinguisher.
A survey carried out by the four main UK fire trade associations, reported by the Fire Industry Association, found that portable fire extinguishers successfully put out the fire in 93 per cent of cases where they were used.
The same body of research has previously estimated that the early use of extinguishers saves the UK economy hundreds of millions of pounds a year in avoided damage, prevents many serious injuries, and saves lives by stopping small fires before they take hold.
A working extinguisher in trained hands is very often the difference between a scorched wall and a gutted building.
Real incidents bear this out.
In July 2022, two minibus drivers working for Ealing Community Transport came across a roadside fire starting to spread near parked cars in West London during the summer heatwave.
Using the fire extinguisher carried on board their minibus, they were able to act immediately, stop the fire spreading, and protect nearby vehicles and passers-by while the fire brigade was called.
The charity later noted that every one of its minibuses carries an extinguisher and that staff are trained to use them. That training and that single serviced extinguisher prevented what could have become a far more serious incident.
A more recent case shows both the value and the limits of portable extinguishers.
In June 2026, a rare 1979 Pontiac Firebird burst into flames on the forecourt of a Tesco petrol station in Abingdon, just over the Oxfordshire border from Berkshire. An onlooker described moving his own car clear, grabbing the forecourt extinguishers, and tackling the blaze alongside the car’s owner and other members of the public.
As he told the BBC, they emptied every extinguisher they could find, and the flames kept reigniting until the last one finally put the fire out, before Oxfordshire Fire and Rescue Service arrived. Nobody was hurt. It is a useful illustration of two things at once.
Extinguishers in the right place and the right hands can hold a serious fire at bay. And a fuel fire can take everything you have got, which is exactly why the number, type and serviceability of extinguishers on a site matter so much.
The point that matters for your business is this. An extinguisher only delivers that outcome if it is the right type for the fire, if it works when the handle is squeezed, and if someone present knows how to use it.
All three of those depend on servicing and training. An out-of-date, wrong-type or unserviced extinguisher is not a 93 per cent success story waiting to happen. It is a prop.
Is fire extinguisher servicing a legal requirement?
Yes, but not in the way most people expect.
The Regulatory Reform (Fire Safety) Order 2005 is the main piece of legislation covering fire safety in non-domestic premises in England and Wales. Article 13 requires the Responsible Person to ensure that fire-fighting equipment is maintained in an efficient state, in efficient working order, and in good repair.
What it does not do is specify a servicing interval.
That detail sits in the British Standards, specifically BS 5306-3, which covers the inspection and servicing of portable fire extinguishers. When a fire risk assessor, a fire officer or an insurer refers to servicing requirements, BS 5306-3 is the document they are working from.
The practical effect is this: if your extinguishers are not serviced in line with BS 5306-3, you are not meeting the standard required to demonstrate compliance with the RRO 2005. That has implications for your fire risk assessment, your insurance, and your liability if something goes wrong.
The Health and Safety Executive is clear on the broader principle: employers must maintain any equipment provided for fire-fighting purposes. Maintenance means more than a visual check. It means a competent person carrying out a formal service to a recognised standard.
Source: HSE fire safety guidance for employers
What does BS 5306-3 actually require?
BS 5306-3:2017 is the British Standard for the inspection and servicing of portable fire extinguishers. It sets out three levels of attention that extinguishers require over their lifetime.
Basic service, carried out annually
Every portable fire extinguisher should receive a basic service at intervals not exceeding twelve months.
This is the annual service most people are aware of, though fewer understand what it actually covers.
A basic service carried out by a competent person includes:
Checking the extinguisher is the correct type for the risk it is positioned against. Verifying the weight or pressure is within acceptable limits.
Inspecting the body for corrosion, dents or damage. Checking that operating instructions are legible and correctly positioned.
Confirming that the safety pin and tamper seal are intact.
Examining the hose and horn for condition and blockages.
Replacing any components that are worn, corroded or otherwise unserviceable.
Attaching a service label showing the date, the engineer’s name, and their certification details.
That last point matters. The label is not just paperwork. It is evidence that the work was carried out by someone competent to do it.
Who is competent?
Competence in this context means a person with the appropriate training, knowledge and experience.
In practice, that means a technician who holds a recognised qualification such as the EAL Level 3 Award in the Servicing and Maintenance of Portable Fire Extinguishers, delivered through providers including IFEDA and the UK Fire Association.
Some contractors also hold third party accreditation under the BAFE SP101 scheme. This is not a legal requirement, but it is increasingly specified in commercial contracts and by larger clients as a condition of appointment.
What matters above all else is that the engineer is qualified, the work is carried out to BS 5306-3, and the service record is properly documented. It does not mean your maintenance contractor who happened to pick up a spare extinguisher at a trade show.
The Fire Industry Association maintains guidance on competency standards for servicing engineers. Appointing an unqualified person to service your extinguishers is not a saving. It is a liability.
Source: Fire Industry Association guidance
The bit most businesses miss: BS 5306-8 and commissioning
Here is the question we get asked surprisingly often: we just bought ten new extinguishers online, do they need servicing straight away?
The answer is yes, and the reason is BS 5306-8.
BS 5306-8, updated to its current 2023 version, covers the selection and positioning of portable fire extinguishers. It also covers commissioning, which is the process of formally placing a new extinguisher into service. Commissioning is not the same as just putting it on a wall bracket and hoping for the best.
When a new extinguisher is commissioned, a competent person should verify that it is the correct type for the hazard, that it is positioned correctly and accessibly, that the pressure indicator reads within limits, that it is undamaged and complete, and that a commissioning label is attached.
The twelve-month service cycle then runs from the date of commissioning, not from the date of manufacture or the date of purchase.
This matters because extinguishers bought online, from cash and carry wholesalers, or through non-specialist suppliers are frequently placed into service without proper commissioning. They may be the wrong type for the premises. They may have been stored incorrectly. They may already be partially discharged. And when the first proper service rolls round, these problems surface, sometimes after years of the extinguisher sitting there looking fine.
A commercial kitchen in Guildford we assessed in 2024 had six water extinguishers installed throughout the premises including directly adjacent to the commercial fryer. Not a single one was appropriate for a cooking oil fire. They had been bought in bulk from an online retailer, installed by the building contractor during fit-out, and not touched since. The fire risk assessment flagged the issue. The client had been operating for four years believing they were covered.
The extended service and overhaul
BS 5306-3 describes four types of service over an extinguisher’s lifetime: the basic service, the extended service, the recharge, and the overhaul.
The basic service is the annual one covered above. The other three are where most businesses lose track.
For water, foam, powder and wet chemical extinguishers, an extended service is required every five years. This goes significantly further than the annual basic service. It involves a full discharge of the extinguisher, internal inspection of the body, replacement of seals and components, and recharging with fresh agent.
CO2 extinguishers are the exception. They do not receive a five-year extended service. Instead they undergo an overhaul at ten years, which takes the form of a hydraulic pressure test of the cylinder. This is because CO2 cylinders are pressure vessels and the test confirms the integrity of the cylinder itself. In practice many companies replace CO2 extinguishers at the ten-year point rather than pay for testing, because the cost is often similar.
The extended service exists because the internal condition of an extinguisher cannot be assessed from the outside. Corrosion, contamination of the extinguishing agent, and pressure component degradation are all invisible until the unit is opened up. An extinguisher that passes its annual basic service year after year can still fail catastrophically if internal corrosion has gone unchecked.
There is also the recharge, which is the process of refilling an extinguisher after it has been used, even partially. An extinguisher that has been discharged, including a quick test squeeze by a curious member of staff, must be recharged by a competent person before it goes back into service. A discharged extinguisher on a wall bracket is not protection. It is a liability dressed up as one.
Every extended service, overhaul and recharge should be recorded on the service label and in the service logbook. If your records do not show these having taken place at the appropriate intervals, that is a finding your fire risk assessor is required to flag.
How long do extinguishers last?
Extinguishers are not lifetime equipment.
As a working rule, most extinguisher types should be withdrawn from service and replaced at around twenty years from the date of manufacture, and many will be replaced sooner if an extended service identifies a problem that cannot be economically repaired.
CO2 extinguishers work to a shorter cycle. Because they are pressure vessels, they require the ten-year hydraulic test described above, and they are frequently replaced at that point rather than tested. A CO2 cylinder that has not been tested within the ten-year period should be taken out of service regardless of its apparent external condition.
It is also worth being clear about so-called service-free options.
Some modern extinguishers, often sold under the P50 type designation, are marketed as requiring no annual engineer service for ten years, on the basis of a corrosion-resistant composite body. The manufacturer’s intention is lower maintenance, and the units do remove the annual strip-down. What the marketing tends to gloss over is this.
For Health and Safety compliance and to satisfy your insurer, the extinguisher still needs to be verified and certified by a competent person, with documentation to evidence it.
An untrained user is not competent to assess whether an extinguisher is safe and fit for service, and is not in a position to issue the paperwork that an auditor, fire risk assessor or loss adjuster will look for.
A quick look by a member of staff is not a substitute for a competent person’s annual check and record.
P50 units can still reduce overall servicing cost and disruption, and they carry a long lifespan, but treat the “service-free” label with care. They are lower maintenance, not no maintenance, and the compliance paper trail still has to come from someone competent.
There is a bigger point here that is easy to miss, and it is one of the strongest arguments against the service-free mindset. The annual extinguisher service is not just about the extinguishers.
For most businesses it is the only time in the year that a qualified, competent fire professional physically walks the premises. A fire risk assessment might be reviewed every few years. The annual service visit happens every twelve months, and a good engineer does far more than tick over the cylinders.
During that visit the engineer checks that extinguisher signage is present, correct and visible.
They look at whether the premises have changed in ways that affect fire safety, a new partition wall, a relocated kitchen, a server room that did not exist last year, a mezzanine added for storage.
They assess whether the type and number of extinguishers still give suitable coverage for the current layout and the current risks, not the layout the building had when the extinguishers were first installed.
They flag where a unit is the wrong type for a hazard that has appeared since the last visit.
They arrange the safe and legal disposal of old or condemned extinguishers, which cannot simply go in a skip.
And they leave a record of all of it.
That regular, expert pair of eyes on the premises has real value beyond the equipment itself.
Remove the annual visit in the name of saving on servicing, and you also remove the one routine moment each year when someone who understands fire safety notices that the risk in the building has quietly moved on. The cost of the service buys more than a working extinguisher. It buys a yearly sense check by someone competent.
Many businesses have extinguishers on their walls that they have simply never replaced.
We routinely encounter extinguishers during assessments that are fifteen, eighteen, even twenty-five years old.
One premises we visited in Farnborough had extinguishers that were manufactured in the late 1990s, still tagged as being in service. The bodies were corroded. The agent had almost certainly degraded. And the original commissioning records had been lost years before.
Replacing extinguishers at the end of their working life is not an optional expense. It is a compliance requirement and a basic duty of care.
What about wheeled, vehicle and specialist extinguishers?
The portable extinguisher on the office wall is only part of the picture. Plenty of businesses across Surrey, Berkshire and Hampshire rely on larger or specialist units, and these have their own servicing requirements that are easy to overlook.
Wheeled and mobile extinguishers
Wheeled extinguishers, sometimes called mobile or trolley extinguishers, are larger units mounted on a wheeled frame, typically holding between 25 and 100 kg of agent.
You find them in warehouses, plant rooms, fuel storage areas, on construction sites and around large outdoor risks.
The servicing principles are the same as for portable units.
They fall under BS 5306-3 and require an annual basic service by a competent person.
The extended service and overhaul intervals also apply, though the larger cartridge-operated designs and bigger cylinders mean the service is more involved and the cost higher. The frame, wheels and any hose reels form part of the inspection, not just the cylinder. A wheeled unit that cannot be moved quickly because the wheels have seized is no use in an emergency.
Because of their size and cost, wheeled extinguishers are far more likely to be overhauled and recharged than simply replaced. That makes keeping the service history complete particularly important.
Vehicle extinguishers on HGVs, vans and coaches
This is the one businesses most often get wrong, and roadside inspection data backs that up. Fire extinguishers are among the most common failure points found during checks on vehicles carrying dangerous goods.
If you run vans, lorries or coaches, the rules depend on the vehicle and what it carries.
For ordinary goods vehicles, an extinguisher must be carried, kept accessible, and maintained in working order.
For vehicles operating under ADR rules for the carriage of dangerous goods, the requirements are specific and strictly enforced. As a general guide, a vehicle up to 3.5 tonnes requires extinguishers totalling at least 4 kg, a vehicle between 3.5 and 7.5 tonnes requires at least 8 kg, and a vehicle over 7.5 tonnes requires at least 12 kg, with one smaller unit dedicated to the cab and engine compartment.
The servicing point that catches operators out is this.
ADR requires each vehicle extinguisher to carry a mark showing the date of the next inspection or the maximum permissible period of use. In practice that means annual servicing by a competent person, with a dated label, exactly as for premises extinguishers. An extinguisher rattling around in a cab footwell with no service label and a seized pin will fail an inspection and can invalidate both your operator compliance and your insurance.
Vehicle extinguishers also live a hard life. Vibration, temperature swings and damp cause powder to compact and bodies to corrode far faster than a unit sitting quietly on an office wall.
The annual service is not a formality for vehicle units. It is the only thing standing between a working extinguisher and a useless one.
Buses, coaches and engine bay suppression
Worth a brief note for operators in the passenger transport sector.
Since 2018, certain new buses and coaches have been required to have fire suppression systems fitted in the engine compartment under international vehicle regulations.
These suppression systems are separate equipment from the handheld extinguisher and require their own scheduled maintenance by a specialist.
If you operate this kind of vehicle, your fire safety provision is not complete just because the handheld unit has been serviced.
Specialist extinguishers
Some risks need specialist units. Lithium-ion battery fires, increasingly common with the growth of e-bikes, e-scooters and electric vehicle charging, are addressed by specific extinguishers using agents such as AVD.
The 2023 revision of BS 5306-8 added specific guidance on lithium-ion battery risks.
These extinguishers still require annual servicing, and the extended service interval can differ from conventional types, so they should be specified and maintained on advice from a competent person rather than bought off the shelf and forgotten.
What does your insurer expect?
This is the section that catches most business owners off guard.
They assume that because they have a policy, they have cover. That assumption can be very expensive.
Most commercial property insurance policies include what insurers call conditions precedent.
These are obligations you must meet for cover to remain valid. Fire safety maintenance is one of them. It is not buried in the small print. It is a standard feature of commercial policies from most mainstream providers.
Direct Line for Business, one of the UK’s most widely used small business insurers, publishes guidance stating that policyholders must maintain fire-fighting equipment on their premises and carry out a fire safety review.
Their published guidance references the British Standards Institution recommendation of one extinguisher for every 200 square metres of floor space and makes clear that maintenance of that equipment is an expectation of cover, not an optional extra.
The broader insurance picture reinforces why this matters. Research published in 2025 by Go.Compare, using data from the Home Office, the Scottish Fire and Rescue Service and the Financial Conduct Authority, found that an estimated £16.7 million in fire-related insurance claims could have been invalidated in the year to March 2024 due to failures involving fire detection equipment.
That figure relates to domestic policyholders, but the principle transfers directly to commercial premises.
The same research found that around 62% of those surveyed had no idea that failing to maintain fire safety equipment could invalidate a claim.
On the extinguisher side specifically, the position is clear across the industry.
Outdated or missing fire extinguisher service certificates are one of the recognised ways businesses can invalidate their commercial property insurance.
When a claim is submitted following a fire, loss adjusters routinely examine maintenance records.
If those records are absent, out of date, or signed off by someone who cannot demonstrate competence, the insurer has grounds to dispute the claim.
Public claims assessors are equally direct on the point: if fire safety equipment has not been serviced or inspected within a reasonable period, an insurer may argue that negligence contributed to the loss. Maintenance records and qualified engineer certificates are what protect your position.
The practical lesson is straightforward.
Your insurance premium is only as good as your maintenance records.
A policy that costs several thousand pounds a year is not worth the paper it is printed on if the loss adjuster arrives after a fire and finds extinguishers with service labels from three years ago, signed by someone with no verifiable qualifications.
Source: Fire Protection Association
Questions we are asked most often
How do I know when my extinguishers were last serviced?
Check the service label attached to the extinguisher body. It should show the date of the last service and the name of the engineer or company. If there is no label, or the label is more than twelve months old, the extinguisher is overdue.
Can I just buy a new extinguisher instead of servicing the old one?
A new extinguisher still needs commissioning under BS 5306-8 before it enters service. And it will need its first basic service within twelve months of commissioning. Buying new is not a way around the servicing requirement.
How many extinguishers do I need?
There is no single legal number. It depends on the floor area, the hazards present and the occupancy, and it is set by BS 5306-8.
As a rule of thumb, one 13A-rated extinguisher covers around 200 square metres of floor space.
For most premises there should be a minimum of two Class A extinguishers per floor with a combined fire rating of at least 26A, although very small upper floors can require less.
A fire risk assessment will confirm whether your current provision is appropriate and correctly positioned, with no point on the floor more than 30 metres from a suitable extinguisher.
What records do I need to keep?
You should retain a service record for each extinguisher.
The record should show the date of each service, the nature of the service carried out, who carried it out, and any defects found and remediated.
These records should be available for inspection by your fire risk assessor, your insurer, and the enforcing authority.
What if the fire service visits and the extinguishers are not serviced?
An inspection by the local fire and rescue service under the RRO 2005 can result in an informal notice, an enforcement notice requiring remedial action, or in serious cases a prohibition notice preventing use of the premises.
Prosecution is also possible where there is evidence of persistent or deliberate non-compliance.
What to look for in a servicing contractor
Not all extinguisher servicing is equal. Here is what to check before appointing anyone to service your equipment.
Ask for evidence of engineer qualification. The recognised qualification is the EAL Level 3 Award in the Servicing and Maintenance of Portable Fire Extinguishers, available through bodies including IFEDA and the UK Fire Association.
Certified engineers carry ID and can evidence their competence.
Ask whether the company holds BAFE SP101 registration, which is a useful third party mark though not a legal requirement.
Ask whether the company carries full public liability insurance.
Ask how service records will be provided and in what format.
Ask whether they can also advise on extinguisher type and positioning, not just carry out the mechanical service.
A contractor who can only service what is already there is less useful than one who can also identify whether what is already there is right for the premises.
What this means for your business
Fire extinguisher servicing is not a box-ticking exercise. It is a legal obligation, an insurance condition, and a basic element of your duty of care to everyone who enters your premises.
Annual basic service under BS 5306-3. Extended service at five years. Hydraulic testing for CO2 at ten years. Replacement at twenty years. Commissioning under BS 5306-8 for anything new.
If you are not certain when your extinguishers were last properly serviced, or whether the types you have are right for the risks in your building, that uncertainty is itself a risk.
ESI Fire Safety provides fire extinguisher servicing and audits across Surrey, Berkshire and Hampshire. If you want a straightforward assessment of where you stand, call 01276 300351 or visit esifiresafety.co.uk/.
