How many fire extinguishers does a building need?

The number depends on floor area, building use and fire hazards. BS 5306-8 requires sufficient extinguishers so that the travel distance to the nearest suitable extinguisher does not exceed 30 metres for Class A risks. As a minimum, each floor needs at least one extinguisher. For offices, approximately one water or foam extinguisher per 200-300m2 is typical, plus CO2 extinguishers for electrical risks. A fire risk assessment determines the exact provision.

What type of fire extinguisher is needed for an office?

Offices typically need water or foam AFFF extinguishers as the primary Class A provision (for paper, wood and general combustibles), plus CO2 extinguishers near electrical equipment such as server rooms, switch rooms and areas with significant IT equipment. Foam AFFF is often preferred as a versatile choice — it covers Class A and B and is safe near (but not on) electrical equipment. Water mist extinguishers are another option that is safe on electrical equipment.

What fire extinguisher is needed for a commercial kitchen?

Commercial kitchens require wet chemical fire extinguishers (yellow label) for Class F fires involving cooking oils and fats. A wet chemical extinguisher is designed to cool and emulsify burning cooking oil, preventing re-ignition. Water, foam and CO2 extinguishers must NOT be used on deep fat fryer fires. A 6-litre wet chemical extinguisher should be positioned within 2m of the cooking appliance. A fire blanket to BS EN 1869 is also recommended.

How often must fire extinguishers be serviced?

BS 5306-3 requires annual servicing by a competent engineer (typically a BAFE registered company). Monthly visual checks should be carried out by the building responsible person — confirming extinguishers are in position, not obstructed, seals intact and pressure gauge in green zone. Extended service intervals apply: CO2 every 10 years, water/foam every 5 years (refurbishment or replacement). Out-of-date extinguishers must be replaced or refurbished.

What is the maximum travel distance to a fire extinguisher?

BS 5306-8 specifies a maximum travel distance of 30 metres to the nearest fire extinguisher suitable for the risk in that area. This means a person should not have to walk more than 30m from any point in the building to reach an appropriate extinguisher. In high-risk areas or where specific hazards exist, the fire risk assessment may specify shorter distances. Extinguishers should be positioned on escape routes, near exits and at fire points.

TradeCalculator.co.uk

Fire Extinguisher Calculator

Calculate the type, quantity and placement of portable fire extinguishers per BS 5306-8 based on building area, use and fire hazard classification.

Building Use

Primary building use

Primary Fire Class

Main fire risk classification

Floor Area per Storey

Usable floor area per storey

Number of Storeys

Total above-ground storeys

Preferred Extinguisher Type

Primary extinguisher type for general risk

How We Calculate This

This calculator determines the type and quantity of portable fire extinguishers based on building area, use and fire hazard classification, following BS 5306-8 guidance.