A Practical Guide to the Different Fire Extinguishers UK Workplaces Need (2026)

Knowing the types of fire extinguishers on your site isn’t just a tick-box exercise — grabbing the wrong one can make a small fire dramatically worse. In the UK, every commercial building must follow the Regulatory Reform (Fire Safety) Order 2005, which means the right extinguishers, in the right places, properly maintained.

This guide walks through the five main different fire extinguishers UK workplaces rely on, what each one is used for, average fire extinguisher price ranges in 2026, and why regular fire extinguisher servicing is a legal must — not a nice-to-have.

Fire safety in UK workplaces is governed by a layered set of rules: the Regulatory Reform (Fire Safety) Order 2005 sets out the duty of the "responsible person"; BS EN 3 governs how extinguishers are built and labelled; and BS 5306-3 controls how they’re commissioned, inspected and serviced. Get any one of these wrong and you’re exposed to enforcement action, insurance issues, and — most importantly — real risk to people on site. Understanding the different types of fire extinguishers and what each one is designed for is the foundation everything else sits on.

The 6 UK Fire Classes (Why Extinguisher Type Matters)

Before picking an extinguisher, you need to know what kind of fire you might face. UK fire classification splits fires into six groups:

•        Class A — solids like wood, paper, fabric, plastics.

•        Class B — flammable liquids such as petrol, diesel, paint.

•        Class C — flammable gases like propane and butane.

•        Class D — combustible metals (magnesium, lithium).

•        Electrical — fires involving live electrical equipment.

•        Class F — cooking oils and fats (commercial kitchens).

No single extinguisher covers all six. That’s why most UK premises need a mix — and why every workplace must have a documented fire risk assessment showing which classes of fire are realistically possible in each part of the building. A modern office, for example, faces mostly Class A risks plus electrical, while a hotel kitchen will add Class F to that picture. Matching the extinguisher to the risk is the whole point.

The 5 Main Types of Fire Extinguishers UK Buildings Use

Under BS EN 3, every modern UK extinguisher has a red body with a coloured label band identifying its contents. Here’s a quick comparison:

Now a closer look at each, including what to use them on:

1. Water Extinguishers (Red Label)

The most common and most affordable extinguisher in the UK. Water works by cooling burning material below its ignition temperature — making it ideal for Class A fires (wood, paper, textiles, soft furnishings) but useless or dangerous on anything else.

Standard sizes are 6 litre and 9 litre, with smaller 3 litre water-additive versions becoming popular because they deliver the same fire rating at a lower weight. You’ll find water extinguishers in offices, schools, shops, warehouses, places of worship, and most domestic settings. Never use them on live electrics, flammable liquids or cooking oil — water conducts electricity, spreads burning oil, and reacts violently with fat fires.

2. Foam Extinguishers (Cream Label)

A Class A fire extinguisher that also tackles Class B. The fire fighting foam (usually AFFF — Aqueous Film-Forming Foam) forms a thin film over flammable liquids, smothering the fire and stopping vapours from reigniting. It cools solids in much the same way water does, but with the bonus of liquid-fire performance.

So what is a foam extinguisher used for in practice? Mostly mixed-risk areas: offices with kitchenettes, garages, factories, retail premises with stockrooms, mechanic workshops, and any environment where flammable liquids might be present alongside ordinary combustibles. Many UK fire risk assessors recommend foam as the default general-purpose unit because it covers the two most common workplace fire classes in a single device, simplifying both training and signage.

3. CO₂ Extinguishers (Black Label)

Carbon dioxide extinguishers work by displacing the oxygen a fire needs to keep burning. Because CO₂ leaves no residue, they’re the go-to choice for protecting expensive or sensitive equipment — server rooms, computer suites, switch rooms, plant rooms, broadcast studios, and laboratories.

CO₂ is rated for Class B (flammable liquids) and electrical fires, but should never be used on Class A solids — the fire is likely to reignite once the gas dissipates. Two key safety notes: the discharge horn becomes extremely cold during use, so always hold the unit by its handle, and CO₂ must be used with care in small enclosed spaces because it displaces breathable air.

4. Dry Powder Extinguishers (Blue Label)

Standard powder extinguishers are often labelled "ABC powder" because they tackle Class A, Class B, Class C and electrical fires — the widest single-unit coverage available. That versatility makes them popular for outdoor settings, vehicles, garages, forecourts, plant yards and small industrial sites.

The downside: the powder cloud reduces visibility almost instantly and can be inhaled, which is why HSE guidance advises against using powder extinguishers indoors except in critical risk areas. Specialist M28 and L2 powder versions exist for Class D metal fires (magnesium, lithium, sodium) — critical now that lithium-ion batteries are everywhere, from forklifts to e-bike chargers.

5. Wet Chemical Extinguishers (Yellow Label)

Designed specifically for Class F fires — cooking oils and fats. The unit discharges a fine mist of potassium salts in solution, which cools the burning oil rapidly and reacts with it to form a thick soapy crust (saponification) that seals the surface and prevents re-ignition.

Wet chemical extinguishers are mandatory in any UK kitchen with a deep-fat fryer and strongly recommended for restaurants, hotels, pubs, care homes, school canteens, takeaways, and any commercial cooking environment. Some models are also rated for Class A and Class B fires, but their primary role is always the cooking-oil risk — they should always be paired with a fire blanket close to the cooker.

Fire Extinguisher Price Guide (UK, 2026)

Average fire extinguisher price varies by type, size and brand. Approximate UK retail figures (including VAT, before installation):

•        Water (6L–9L): £25 – £50

•        Foam (6L–9L): £35 – £70

•        CO₂ (2kg–5kg): £45 – £110

•        Dry Powder (6kg–9kg): £30 – £80

•        Wet Chemical (3L–6L): £70 – £130

Service-free P50 extinguishers cost more upfront (typically £120–£200) but skip the annual engineer visit for ten years, which can work out cheaper for small businesses over the unit’s lifetime. Don’t forget to budget for wall brackets, ID signs, fire blankets in kitchens, and the commissioning visit — these are usually quoted separately by suppliers but are required for compliance.

Fire Extinguisher Servicing: What the Law Requires

Fire extinguisher servicing isn’t optional. Under BS 5306-3, every UK workplace extinguisher must be:

•        Visually checked monthly by the responsible person on site.

•        Serviced annually by a competent (ideally BAFE-registered) engineer.

•        Discharge tested every 5 years for water, foam and powder units.

•        Refurbished or replaced at 10 years (CO₂ and most others).

Skipping servicing puts you in breach of the Fire Safety Order — and an extinguisher that hasn’t been checked could fail when you need it most. Keep a fire safety log on site recording every visual check, every annual service, and any fault remedied. Insurers and enforcement officers will ask to see it.

A common mistake is to assume the supplier handles everything. They don’t. The annual service is the engineer’s job, but the monthly visual check sits with you or your nominated responsible person, and it must be documented even when nothing is wrong. Five minutes a month protects both lives and your audit trail.

How to Choose the Right Extinguishers for Your Site

A fire risk assessment should drive your decision, but a useful rule of thumb:

•        Office or shop: foam + CO₂ covers most everyday risks.

•        Commercial kitchen: wet chemical + fire blanket near cooking stations.

•        Warehouse: foam or water for stock + CO₂ near electrical kit.

•        Construction site: dry powder + water (mobile, all-weather cover).

•        Server / plant room: CO₂ — leaves no residue on equipment.

Placement, Signage and Training: The Often-Forgotten Basics

Buying the right extinguishers is only half the job. UK guidance (BS 5306-8) recommends that no person should ever have to travel more than 30 metres to reach an extinguisher on Class A risks, and a shorter distance for higher-risk classes. Units should be mounted on brackets at a height of around 1 metre to the handle (or 1.5 metres for smaller extinguishers), never placed loose on the floor, and always visible — not tucked behind doors, stacked stock or coat racks.

Every extinguisher needs an ID sign above it showing what type it is and which fire classes it covers. A small minority of staff will ever need to use one, but every member of staff should know where they are, what they’re for, and — critically — that the priority is always raising the alarm and evacuating, not fighting the fire.

That’s where training comes in. Under Article 21 of the Fire Safety Order, employers must provide appropriate fire safety training when staff start, and at regular intervals afterwards. A short online fire awareness course gives every employee the basics: spotting hazards, recognising alarms, escape routes, and which extinguisher to grab if (and only if) it’s safe to act.

Summary

Choosing between the different types of fire extinguishers comes down to understanding the fire risk in your building, knowing which class of fire each unit fights, placing them where people can actually reach them, and keeping every unit properly serviced. Get it right and you protect lives, property and your legal standing. Get it wrong — by skipping the risk assessment, installing the wrong unit, mounting it in the wrong place, or letting servicing lapse — and a manageable fire can turn catastrophic in minutes.

Whether you’re a site manager, business owner or tradesperson on a UK construction site, basic fire awareness training is the foundation everything else sits on. Build it into your induction process, refresh it every year, and combine it with a properly maintained extinguisher fleet to demonstrate that fire safety isn’t just a poster on the wall — it’s how you actually run the site.

Frequently Asked Questions

How many types of fire extinguishers are there in the UK?

There are five main types of fire extinguishers used in UK workplaces today: water, foam, CO₂, dry powder and wet chemical. Each is identified by a coloured label band on a red body, in line with BS EN 3, and each is rated for specific classes of fire.

What is a foam extinguisher used for?

Foam extinguishers tackle Class A (solid) and Class B (flammable liquid) fires. The fire fighting foam smothers liquid fires and stops them re-igniting, which is why they’re the most common general-purpose choice in offices, factories and warehouses.

Which is the best Class A fire extinguisher?

For pure Class A risk, water is cheapest and effective. Foam is the better all-rounder if you also have Class B risks. Water mist is a strong modern alternative — it covers most fire classes and leaves minimal mess.

How much does fire extinguisher servicing cost?

Typical annual servicing costs around £15–£25 per extinguisher in the UK in 2026, depending on location and contract size. Five-yearly extended services and ten-year refurbishments cost more.

Can I buy fire extinguishers myself or do I need a supplier?

You can buy direct, and there’s a wide choice of different fire extinguishers UK suppliers offer online. However, commissioning by a competent engineer is strongly recommended (and required by BS 5306-3). Many UK suppliers include first-year commissioning in the fire extinguisher price.

Are old coloured fire extinguishers still legal?

Solid-colour extinguishers (cream, blue, black bodies) from before 1997 are still legal if they’re serviceable, but should be replaced with BS EN 3 red units at end of life. Green Halon extinguishers are illegal and must be disposed of professionally.