Landlord guide

Reviewed 18 August 2026

Do landlords need a Legionella certificate?

Landlords are frequently offered a Legionella certificate alongside gas and electrical safety documents, which makes it look like part of the same statutory set. It is not.

This guide separates the three things that get confused — the risk assessment report, temperature monitoring and laboratory sampling — and explains what is worth keeping.

The short answer

No. The HSE states that health and safety law does not require landlords to produce a Legionella test certificate for a residential letting. There is no statutory certificate to obtain.

What is expected is that you assess the risk, control it sensibly and can show that you did. That is the job of a Legionella risk assessment report, not a certificate.

Anything sold as a "landlord Legionella certificate" is a commercial product. It may be based on real work, but the certificate itself has no statutory standing.

General information, not legal advice. This guide describes the position in Great Britain. Northern Ireland is regulated by HSENI, and the Republic of Ireland has a separate legal framework — see the country pages.

Why the confusion exists

Gas safety produces a statutory record. Electrical installation condition reports have a defined form and interval. Energy performance certificates are certificates in the literal sense. Legionella sits differently: the duty is to assess and control risk, and the law does not prescribe a document to hand over.

Because tenants and agents are used to collecting documents, a market appeared for something certificate-shaped. That does not make it a legal requirement.

Three different things, often confused

Legionella risk assessment report: A property-specific record of the water system, the risks identified, the controls in place, the findings and actions, and when it will be reviewed. This is what the duty actually calls for.
Temperature monitoring: Recorded hot and cold readings at named outlets. Evidence that a control is working as expected. Not a laboratory test and not proof of the absence of bacteria.
Microbiological sampling: A laboratory analysis of a water sample for Legionella bacteria. The HSE says routine sampling is not usually required for domestic hot and cold water systems, and it is reserved for specific circumstances.

What tenants, agents and mortgage or insurance forms usually want

When someone asks for "the Legionella certificate", they almost always want reassurance that the risk has been assessed. A dated, property-specific risk assessment report answers that question far better than a certificate, because it shows the system, the findings and what was done about them.

If a form insists on the word certificate, it is usually enough to supply the risk assessment report and note that health and safety law does not require a Legionella test certificate for residential lettings.

Why keeping a record is still worth it

It is the only practical way to show the risk was assessed and understood
It tells whoever assesses next what the system looked like and what was found
It gives the tenant and any agent the water-use information they need
It keeps actions visible until they are completed
It gives you a baseline, so a later change is obvious

What LegionellaWise produces

LegionellaWise produces a structured, versioned Legionella risk assessment report: the system description, the outlet register, the observations and photo evidence, the findings and actions, and the review date you chose. Each finalised report has a reference that can be checked on the public verification page, so a tenant or agent can confirm the document is genuine.

It is a report, not a certificate, and it does not assert that a property is free of Legionella bacteria. No document can do that.

Questions landlords also ask

My letting agent is asking for a Legionella certificate — what do I send?

Send the Legionella risk assessment report for the property. It contains everything the agent needs, and you can explain that no statutory certificate exists for residential lettings.

Does a water sample result count as a certificate?

No. A laboratory result describes one sample at one moment. It does not demonstrate that risk is being managed, and a negative result does not show the system will stay safe.

How long should I keep the report?

Keep it at least until it has been superseded by a later version, and ideally keep the history. Being able to show how a property's water system and findings changed over time is far more useful than holding only the latest document.

Is a certificate needed for an HMO or a licensed property?

Licensing conditions vary by council and can ask for evidence that risks have been assessed. Even then it is the assessment record they are looking for. Shared and more complex systems commonly need a competent specialist rather than self-assessment.

See whether guided self-assessment fits your property

The free suitability check asks a short set of questions about the water system, the building and the occupants, then tells you plainly whether guided self-assessment looks appropriate or whether the property should go to a specialist.

Check if my property is suitable See how LegionellaWise works

Official sources

General information, not legal advice. Requirements and guidance differ between jurisdictions — check the country page that applies to your property.