Do I Need to Replace My Fire Extinguisher?

This question usually comes up when our client has just received a service report or quote from their fire extinguisher company telling them that one or more extinguishers need to be replaced. When it’s a single unit, that might feel manageable. When it’s several extinguishers at once, the cost can escalate quickly and it’s entirely reasonable to want to check whether replacement is genuinely necessary. We understand that reaction. Fire extinguishers are often out of sight, rarely used, and may look perfectly serviceable. Being told they now need replacing can feel abrupt, especially if little explanation is provided. The reality is that different types of fire extinguishers have different replacement timelines and different technical reasons for being withdrawn from service.

Why Replacement Is Often Recommended

Most professional fire extinguisher service companies work to British Standard BS 5306, which sets out how extinguishers should be inspected, serviced and, where necessary, replaced. Replacement is not usually arbitrary. It is normally driven by one or more of the following:

  • The age of the extinguisher.

  • Its construction type and materials.

  • Internal degradation that cannot be seen externally.

  • Requirements for extended servicing or pressure testing.

  • Manufacturer support or lack of replacement parts.

Understanding which of these applies makes it much easier to judge whether a recommendation is reasonable.

Different Extinguishers, Different Replacement Rules

When it concerns extinguisher life, not all extinguishers are treated the same.

Water, Foam and Powder Extinguishers
These are often designed with a 5-year service life. At this point, BS 5306 typically requires extended servicing that may involve discharge, internal inspection or factory-level processes. In many cases, replacement is more practical and cost-effective than extended service, which is why service companies frequently recommend renewal at around five years.

CO₂ Extinguishers
CO₂ extinguishers are constructed differently. They are pressure vessels and usually have a much longer lifespan, often 10 years or more. Rather than routine replacement, they are subject to periodic pressure testing. If they pass testing and remain in good condition, replacement may not be required at the same interval as other extinguisher types.

Older or Obsolete Models
Some extinguishers are no longer supported by manufacturers. If seals, valves or internal components cannot be replaced or verified, service companies may have little choice but to recommend replacement, even if the extinguisher appears outwardly sound.

Condition Matters as Much as Age

Age alone is not the only factor. An extinguisher may need replacing if:

  • The cylinder is corroded, dented or damaged.

  • The pressure gauge is outside the operational range (where fitted).

  • Operating instructions or safety markings are missing or illegible.

  • The extinguisher has been partially or fully discharged.

  • It no longer meets current installation or performance expectations.

In these cases, replacement is usually justified, regardless of age.

Why Multiple Replacements Can Happen at Once

It’s common for several extinguishers to reach the same replacement point together, particularly if:

  • They were installed at the same time

  • They are the same type and manufacturer

  • Servicing has been carried out consistently over several years

While this can feel sudden, it often reflects a lifecycle issue rather than a change in enforcement or standards.

Is It Reasonable to Question a Replacement Quote?

Yes. Sensible clients ask sensible questions. You are entitled to understand:

  • Why each extinguisher needs replacing.

  • Whether replacement is due to age, condition or standard.

  • Whether extended servicing is an option.

  • Whether the extinguisher type is still appropriate for the risks.

A reputable service provider should be able to explain this clearly.

The Role of the Fire Risk Assessment

Your fire risk assessment should confirm:

  • What types of extinguishers are required.

  • Where they should be located.

  • Whether they remain appropriate for the risks present.

If your building use has changed, replacement may be necessary even if the extinguishers themselves are still within service life.

Independent Advice Can Help

If you are unsure whether replacement recommendations are proportionate, independent advice can be valuable. We do not sell fire extinguishers, which means we have no commercial incentive to recommend replacement. We can review your fire risk assessment, look at the context of the advice you’ve been given, and help you understand whether replacement is justified or whether alternatives exist.

When multiple extinguishers are involved, clarity matters. Understanding the reasons behind replacement recommendations allows you to make informed decisions, manage costs properly, and remain confident that your fire safety arrangements are appropriate and defensible.

Disclaimer:
This article is provided for general information only and does not constitute legal advice. Fire safety duties and equipment requirements depend on the specific risks and circumstances of each premises. A competent fire risk assessor should be consulted to determine appropriate fire safety measures.

© Fletcher Risk Team - 22 January 2026

Tim Fletcher