How Much Does a Legionella Risk Assessment Cost?

One of the first questions property and facilities managers ask is a simple one: how much does a Legionella risk assessment cost? The honest answer is that it depends — but the factors that drive the price are straightforward, and knowing them helps you budget and compare quotes fairly. Here is what actually determines the cost.

What affects the cost of a Legionella risk assessment?

The price of a Legionella risk assessment is driven mainly by the size and complexity of your water system, not a flat rate. The key factors are:

• Size and complexity of the water system — more pipework, plant and stored water takes longer to survey.
• Number of outlets and assets — taps, showers, tanks, calorifiers and other assets all need recording.
• Type and use of the building — a small office is quicker to assess than a care home, gym or multi-let block.
• Number of sites — multi-site portfolios are usually priced per site, often with a discount at volume.
• Whether water sampling is included — adding UKAS-accredited sampling increases the cost but may be recommended.
• Accessibility and existing records — hard-to-reach plant and missing documentation add time.

What's included in the price?

A compliant Legionella risk assessment should include a full site survey, an asset register, a schematic or written description of the system, a risk rating for each area, and a written report setting out prioritised recommendations. Some providers also include asset labelling and a log book to help you manage the system afterwards. When comparing quotes, check that all of this is covered — not just a walk-round.

How much should you expect to pay?

Because every site is different, there is no single price. As a general guide, an assessment for a small, low-risk premises with a simple water system is usually a modest fixed fee, while larger, multi-outlet or multi-site properties are quoted individually based on the number of assets and outlets surveyed. For an accurate figure it is always best to get a quote based on your actual system rather than an online estimate.

Is the cheapest assessment the best value?

Not always. A Legionella risk assessment only protects you if it is thorough and carried out to the standard set by the HSE's Approved Code of Practice L8 and HSG274. A very cheap, box-ticking assessment that misses assets or gives vague recommendations can leave you exposed — both to risk and to enforcement action. Look for competence, clear documentation and UKAS-accredited sampling where needed. Our guide to what a Legionella risk assessment involves and who needs one explains what a good assessment should cover.

Getting a quote in London

London Water Treatment carries out Legionella risk assessments across London for offices, care homes, schools, landlords and commercial premises, with clear pricing based on your system. Get in touch for a tailored quote.

Frequently asked questions

How often do you have to pay for a new risk assessment?

A Legionella risk assessment should be reviewed regularly and whenever your system or its use changes. In many cases the existing assessment is reviewed and updated rather than started from scratch, which is usually less costly than a first full assessment.

Does the cost include Legionella testing?

Not always — sampling is often quoted separately. Whether you need it depends on your system; see our guide to Legionella testing and water sampling for when it is recommended.

Related articles

• What Is a Legionella Risk Assessment and Who Needs One
• Legionella Testing: What It Involves and When You Need It