Can a landlord carry out their own Legionella risk assessment?
Self-assessment is legitimate and, for a typical house or flat, usually appropriate. The honest question is not "am I allowed?" but "am I competent for this system?".
This guide sets out what competence means in practice, gives worked examples on both sides of the line, and lists the triggers that should send a property to a specialist.
The short answer
Often, yes. There is no legal requirement to appoint a third-party assessor for a straightforward domestic water system, provided the person carrying out the assessment is competent for that particular system.
Competence means understanding the system, recognising what creates risk, taking and interpreting observations properly, and knowing the limits of your own knowledge.
Where the system is communal, complex or higher risk, or where the occupants are particularly vulnerable, the assessment should go to a competent specialist.
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.
What competence actually means
Competence is a combination of knowledge, experience and self-awareness applied to a specific system. It is not a qualification you buy, and it is not conferred by using software — including ours. A guided workflow structures and records the work of someone competent; it cannot supply the judgement.
- You can describe how water is supplied, heated, stored and distributed in this property
- You can identify dead legs, redundant pipework, little-used outlets and poor tank condition
- You understand why warm stagnant water and breathable spray matter
- You can take and record a meaningful temperature reading, and know what a blended outlet means
- You know which findings you can act on and which need a plumber or specialist
- You are willing to say "I do not know" and refer the property on
Likely suitable for guided self-assessment
- A self-contained house or flat with a combi boiler and no stored hot water
- A house with a single conventional hot-water cylinder serving one household
- A property in continuous occupation with outlets in regular use
- An electric instantaneous shower with no stored water
- A small property where you can access the loft, cupboards and every outlet
Use a competent specialist
- Communal or shared water systems serving more than one dwelling
- Shared cold-water storage tanks or plant rooms you do not control
- Large, unusual or poorly documented stored hot-water systems
- Properties with a spa or hot tub, a swimming pool, a fountain or an evaporative cooling system
- Occupants who are known to be particularly susceptible to infection
- Any property where a case of Legionnaires' disease has been associated with the water system
- Any situation where you cannot confidently explain what you are looking at
A quick decision path
- 1
Is the system simple and entirely under your control?
If any part of it is shared or controlled by someone else, coordinate with them or refer the assessment.
- 2
Can you access and observe everything relevant?
If tanks, cylinders or outlets are inaccessible, you cannot assess them and neither can a template.
- 3
Do you understand what each observation means?
Recording a number is easy. Knowing when a reading is expected, unexpected or misleading is the competence.
- 4
Are the occupants at higher risk?
Where susceptibility is a known factor, take specialist advice rather than relying on a proportionate low-risk approach.
- 5
Do you know who to call when something is beyond you?
Self-assessment works when it includes an honest referral route, not when it becomes a way of avoiding one.
Where LegionellaWise fits
The free suitability check asks a short set of questions about the water system, the building and the occupants, and tells you plainly whether guided self-assessment looks appropriate or whether the property should be referred. It is designed to say no when no is the right answer.
If self-assessment is appropriate, the guided workflow keeps the process consistent and produces a structured, versioned report. Deciding whether you are competent for a particular property remains yours to make.
Questions landlords also ask
Do I need a qualification to assess my own property?
No specific qualification is required for a simple domestic system. What is required is competence for that system — knowledge, relevant experience and awareness of your limits.
Does using software make me competent?
No. Software can structure the process, prompt for the right information and keep the evidence together, but the judgement about what you are seeing remains yours.
Can my letting agent do it instead?
An agent can carry out or arrange the assessment if the management agreement allocates that responsibility and the person doing it is competent. Make the allocation explicit in writing.
What does a specialist assessment usually involve?
A competent specialist will survey the system in more depth, often including a schematic, an assessment of plant you may not have access to, and a written scheme of control where the system warrants one.
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.
Official sources
- HSE — Legionella and landlords' responsibilities
- HSE — Identify and assess sources of risk
- HSE — Approved Code of Practice and guidance L8
- Scottish Government — Model private residential tenancy notes (Legionella)
General information, not legal advice. Requirements and guidance differ between jurisdictions — check the country page that applies to your property.
Related reading
How to do the assessment
A step-by-step process for a simple domestic property, from competence and system description through to findings, tenant information and review triggers.
Combi boiler properties
No stored hot water usually lowers the risk, but it does not remove the duty to assess — or the risks from stagnation, showers and little-used outlets.
Is it a legal requirement?
The duty is to assess and control the risk — not to buy a certificate or fill in a prescribed form. How that plays out across the UK and Ireland.
Water temperatures
Common HSE reference points for hot and cold water, what a reading does and does not prove, and how to record one properly with TMV and scalding caveats.