How Much Does a Legionella Risk Assessment Cost in the UK?

The cost of a Legionella Risk Assessment in the UK can vary depending on the type of property, the complexity of the water system, and the level of detail required.

For most properties, prices typically range between £100 and £500, although larger or more complex systems may cost more.

Understanding what affects the cost can help you choose the right level of assessment for your needs.

What Affects the Cost of a Legionella Risk Assessment?

Several factors influence pricing, including:

• Size of the property
• Complexity of the water system
• Number of outlets (taps, showers, etc.)
• Presence of tanks or stored water
• Type of building (domestic vs commercial)

Larger properties or those with more complex systems require more time to inspect, which increases the cost.

Typical Cost by Property Type

Domestic Properties (Low Risk)

• £100 – £250
• Suitable for small homes with simple water systems

HMOs and Rental Properties

• £150 – £350
• Depends on number of rooms and outlets

Commercial Properties

• £250 – £500+
• Varies significantly based on system size and complexity

Is the Cheapest Option the Best?

Not always.

A very low-cost assessment may:

• Lack detail
• Miss key risks
• Provide limited recommendations

A professional Legionella Risk Assessment should include a clear report, risk evaluation, and practical guidance for compliance.

What’s Included in the Cost?

A proper Legionella Risk Assessment should include:

• Full inspection of the water system
• Identification of risks
• Photographic evidence (where applicable)
• Detailed report with recommendations
• Guidance on next steps

 This ensures you have everything needed to manage risk effectively.

Do Landlords Need to Pay for an Assessment?

Yes — landlords are responsible for ensuring that Legionella risks are assessed and managed.

You can read more in our guide on whether landlords need a Legionella Risk Assessment.

Can You Do It Yourself?

For simple, low-risk properties, landlords may carry out their own assessment.

However, many choose to use a professional service to:

• Ensure compliance
• Avoid missing risks
• Provide documented evidence

Why Investing in a Proper Assessment Matters

A Legionella Risk Assessment is not just a compliance exercise — it helps protect health and reduce liability.

Cutting corners can lead to:

• Increased risk of Legionella growth
• Potential legal issues
• Higher long-term costs

Conclusion

The cost of a Legionella Risk Assessment in the UK typically ranges from £100 to £500, depending on the property and system complexity.

Choosing the right assessment ensures you remain compliant and have confidence that your water systems are safe.