How much does a legionella risk assessment cost for a landlord?
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Key points
- Most lets cost £0. A competent self-assessment is legitimate for simple domestic systems, and the HSE says so in its landlord guidance.
- Paying a professional costs £150 to £350 for a typical single let; complexity, not prestige, is what justifies paying.
- No annual test, no certificate. Routine sampling is not normally required for domestic systems, and there is no statutory certificate to renew.
- The three things that push a let out of DIY territory: shared tanks (HMOs), stored hot water, and vulnerable tenants.
- Whatever route you take, write it down. An unrecorded assessment cannot be evidenced, so on paper it never happened.
For most landlords the honest cost of a legionella risk assessment is nothing, because most single domestic lets have simple water systems that a competent landlord can assess and record themselves. If you would rather pay someone, expect £150 to £350 for a standard rental property. Anything quoting significantly more for a straightforward let is selling you complexity the property does not have.
Why most lets are DIY-free
The typical single let is, in water terms, boring: mains-fed cold water, a combi boiler that heats hot water on demand so nothing is stored, short pipe runs, and outlets in daily use. That combination removes almost everything legionella needs. There is no stored warm water, no long dead legs, no cooling tower, and the water turns over constantly. The HSE's own landlord guidance reflects this: a simple written assessment and basic controls are sufficient, and annual sampling is not normally required.
The legal duty itself is real. Renting a property brings it within the Health and Safety at Work etc. Act 1974, so you must assess and control the risk, as the landlord responsibility guide explains. But the duty is to assess and record, not to buy a survey. Doing it yourself is a legitimate route, and the free risk assessment builder walks you through the same structure a contractor would use, at £0. It records your assessment; it never certifies your property.
The decision aid: DIY or pay?
| Your property | Sensible route | Why |
|---|---|---|
| Single let, combi boiler, mains cold | Self-assess, £0 | No stored water; the lowest-risk configuration there is |
| Single let with a hot water cylinder | Self-assess, £0, with care | Check the cylinder stores at 60°C and record it |
| Property empty between tenancies | Self-assess plus a flush-through on relet | Standing water is the risk; flush every outlet to temperature before the new tenant moves in |
| HMO with shared cold water tank | Consider paying, £150 – £350 | Shared stored cold water raises the stakes and the complexity |
| Let to elderly or vulnerable tenants | Consider paying, or self-assess rigorously | The consequences of getting it wrong are higher |
| Portfolio of several lets | Self-assess systematically, template per property | Paying per property multiplies fast; a repeatable self-assessment process scales |
What the £150 to £350 buys when you do pay
A competent contractor's visit to a simple let is short: walk the system, confirm how hot water is made and stored, take temperatures at the outlets, note any dead legs or little-used outlets, and leave a written assessment. You are paying for an experienced pair of eyes and a document with someone else's name on it, which some landlords want for their own records or because an agent insists. That is a reasonable purchase, as long as you know it is the same legal object as your own recorded self-assessment, not a superior one. What it should never be is a "certificate": see what a legionella certificate is and is not and what one costs before paying for anything with that word on the quote.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
The costs that are not the assessment
Two recurring charges get bundled into landlord conversations and should be picked apart. The first is annual sampling: rarely needed for a domestic system, so question any contract that schedules lab tests as routine. The second is annual reassessment: there is no fixed legal interval, and HSE guidance points to reviewing the assessment when something changes, a new bathroom, a boiler swap, a void period, with about every two years being common practice. See how often to review. A subscription that bills you yearly for a document that has not changed is billing for a ritual, not a control.
The landlord's duty costs time, not money: one honest walk through the water system, a note of the controls, and a record you keep. Pay for complexity when you have it, not for a certificate that does not exist.
Keep the assessment, your control notes and any temperatures you take in one place. The log book holds the flushing and shower head cleaning records between reviews, the temperature checker turns each reading into a clear pass or fail, and the cost calculator tells you whether a quote you have been given is in the normal range for your property type.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Frequently asked questions
How much does a legionella risk assessment cost for a landlord?
Between £0 and about £350 for most single lets. £0 if you carry out a competent self-assessment, which the HSE accepts for simple domestic systems, and £150 to £350 if you pay a professional. Houses in multiple occupation with shared water tanks, and properties with stored hot water or long standing periods between tenants, sit at the top of the range.
Do landlords have to pay for a legionella test every year?
No. This is the most expensive myth in the sector. HSE guidance for landlords confirms that routine water sampling is not normally required for domestic systems, and there is no annual test or certificate to buy. The duty is a written risk assessment plus simple controls, reviewed when the system or its use changes, not a recurring lab bill.
Can a landlord do their own legionella risk assessment?
Yes, provided you are competent, which for a simple domestic system means understanding the water system, the temperatures that control legionella, and what to record. Most single lets fall into this category. The assessment must be written down and kept, because the record is the evidence the duty was discharged. If the property is complex, an HMO with shared tanks for example, paying a competent assessor is the safer route.
What does a letting agent mean when they ask for a legionella certificate?
They almost always mean a written legionella risk assessment. There is no statutory legionella certificate in the UK and the HSE does not issue or require one. If an agent's paperwork asks for a certificate, supply your recorded assessment and control notes, and point them to the HSE landlord guidance if they push back.
Is a legionella risk assessment a legal requirement for landlords?
Yes. Renting out a property brings it within the Health and Safety at Work etc. Act 1974, so the landlord must assess and control the risk from legionella in the water system. The duty is real but modest for a simple domestic let: a written assessment, basic controls such as advising tenants on flushing and shower head cleaning, and a record that both were done.
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