UK Fire Extinguisher Regulations: What Does Your Business Actually Need?

Under the Regulatory Reform (Fire Safety) Order 2005, UK businesses are legally required to provide appropriate firefighting equipment. But fire extinguishers are not ‘one size fits all’

Using the wrong type of fire extinguisher can be ineffective and, in some cases, such as using water on an electrical fire, can be life-threatening.

To help protect your staff and premises, here is a clear breakdown of the types of fire extinguishers UK businesses require, how they are colour-coded, and where each type should be located.

The fire classes:

Before diving into how to identify each extinguisher and its purpose, it is important to understand the different classes of fire that extinguishers are designed to tackle.

• Class A: Fires involving solid materials like wood, paper, cardboard, and textiles

• Class B: Fires fueled by flammable or combustible liquids, such as petrol, diesel, paints, and solvents

• Class C: Fires involving flammable gases, including butane, propane, and methane

• Class D: Fires involving combustible or specialist metals like magnesium, sodium, or lithium

• Electrical: Not assigned a specific letter code, but defined as fires involving energised electrical equipment, appliances, or faulty wiring

• Class F:  Fires caused by high-temperature cooking oils and fats

The 5 standard fire extinguishers:

All UK fire extinguishers feature a distinct colour-coded label near the top indicating their contents and intended fire class.

Red Label (Water): Defends against Class A fires.

Cream Label (Foam): A versatile option that tackles both Class A and Class B fires.

Black Label (Carbon Dioxide): Crucial for modern office spaces. CO2 suffocates fires involving electrical equipment without leaving a messy residue that destroys your hardware.

Blue Label (Dry Powder): Often called “ABC” extinguishers because they handle solids, liquids, and gases. However, current British Standards recommend against using them indoors unless necessary, as the dense powder cloud can cause several severe visibility and inhalation issues.

Yellow Label (Wet Chemical): Specifically designed for Class F fires. These extinguishers are a strict legal requirement in commercial kitchens, canteens, and restaurants.

The ‘two extinguisher’ rule:

While a Fire Risk Assessment will determine your specific needs, UK guidance provides a general baseline for most low- to medium-risk business premises:

• Minimum equipment: You typically require at least two Class A extinguishers per floor

• The 30-metre rule: Employees should not have to travel more than 30 metres from any point in the building to access a fire extinguisher.

• Electrical hazards: If your building contains electrical equipment, a Class A extinguisher is usually paired with a CO2 extinguisher to create a standard ‘fire point’

Maintenance:

Simply purchasing the right extinguishers isn’t enough. Neglected or poorly maintained extinguishers can fail when they are needed most. Business owners must ensure:

• Visual inspections: Monthly internal checks to ensure pressure gauges are in the green and safety pins are intact

• Annual servicing: A legal requirement for a qualified, third-party engineer, such as an engineer from Commfire, to check the seals, weight, and internal mechanisms.

• Extended servicing: Replace units every 5–10 years, depending on the specific model.

Don’t guess when it comes to legal compliance and human safety. At Commfire, we provide comprehensive fire safety engineering across Andover, Hampshire, and the surrounding areas. From supplying, installing, and maintaining certified equipment to making sure you have the correct fire extinguishers for your business, our experienced team helps ensure your fire protection remains compliant and reliable.