- As a broad UK guide, a small office or shop starts from around £150 to £300; mid-size premises with showers and tanks run £300 to £600; large or complex systems, or those with cooling towers, several hundred pounds to four figures.
- The size and complexity of the water systems, the number of outlets and the availability of schematics drive the price.
- The assessment fee should include a site survey, a schematic, the written risk assessment and a written scheme of control.
- Ongoing monitoring (temperatures, flushing, cleaning) is a separate recurring cost, often done in-house or under a maintenance contract.
Legionella risk assessment pricing is reassuringly modest for most premises, because most premises have simple water systems. The cost rises when there are showers, tanks, long pipe runs, cooling towers or multiple buildings, and it rises again if you want the provider to run the ongoing monitoring. Here is how to read a quote.
Typical costs
| Premises | Indicative fee (guide only) |
|---|---|
| Small office or shop: basic hot and cold water | from around £150 to £300 |
| Mid-size premises: showers, tanks, several outlets | around £300 to £600 |
| Large or complex: multiple buildings, cooling towers, spa pools | several hundred to £1,000+, quoted on inspection |
Indicative ranges, not a quote.
What drives the price
- Water system complexity. Tanks, calorifiers, long dead legs and multiple risers take longer to survey.
- Outlets. More taps and showers mean more sampling points and temperature checks.
- High-risk systems. Cooling towers, evaporative condensers and spa pools need specialist assessment.
- Existing records. Schematics and previous assessments speed the job.
- Number of sites. Portfolios are priced together, usually at a lower per-site rate.
What the fee should include
A site survey of the water systems, temperature readings at representative outlets, a schematic of the system, the written risk assessment with identified risks and actions, and a written scheme of control setting out the monitoring regime. If a quote covers only a report with no schematic or scheme, it is not a complete assessment. Our guide to the written scheme explains what that document contains.
Compare assessment quotes
Match with competent legionella risk assessors who cover your area. No-obligation quotes.
Ongoing costs
The assessment is the one-off. The scheme it produces requires monthly temperature checks, flushing of little-used outlets, periodic tank inspection and cleaning, and records. Many businesses do the monthly checks in-house and contract the periodic tasks; others contract the whole programme. A maintenance contract can carry it. Budget for it rather than being surprised.
Keeping it proportionate
- Choose an assessor who scales the assessment to the risk; a small office does not need a hospital-grade report.
- Have schematics and previous records ready.
- Price several sites together.
- Compare quotes on what is included.
Getting quotes
Assessors need the premises type, the water systems present (showers, tanks, cooling towers), the approximate size, whether there is an existing assessment and the postcode. ComSurv gathers that in about a minute and returns no-obligation quotes from competent assessors who cover your area.
Sources & further reading
- HSE ACoP L8 — what an assessment must achieve
- Legionella Control Association — members offering assessment and monitoring
External links open in a new tab. ComSurv is a matching service, not a firm of surveyors, and is not affiliated with these organisations. This article is general information, not legal, surveying or valuation advice; take advice on your specific situation.
