Can a landlord legally do their own legionella risk assessment?

Yes if they are competent. HSE does not mandate an external consultant for every simple domestic let, but ACoP L8 still requires a suitable and sufficient assessment and controls.

What does competent mean under ACoP L8?

Enough training, knowledge, experience and equipment to identify water hazards — including temperature profiling, dead legs, tanks and aerosol sources — and to record findings defensibly.

What temperatures should sentinel taps show?

HSG274 Part 2 sets the usual checks: cold water below 20°C after running for two minutes, hot water at least 50°C within one minute at outlets (55°C in healthcare premises), and stored hot water at 60°C.

When should a landlord hire a professional instead?

HMOs, shared showers, tanks, complex pipework, vulnerable tenants, or any doubt about competency. A poor DIY assessment is worse than none if it creates false assurance.

How much does a domestic legionella assessment usually cost?

Typical matched domestic visits are about £90–£180; HMO or complex systems £150–£350. Ask for a quote with premises type and postcode.

Does using Safety Certificates UK move legal liability away from me?

No. The dutyholder remains responsible under HSWA and COSHH. We match assessors; we do not take on your statutory duty.

Can a Landlord Do Their Own Legionella Risk Assessment?

Short answer: yes. A landlord can carry out their own legionella risk assessment if they are competent to do it for that property. HSE’s landlord guidance applies section 3 of the Health and Safety at Work etc. Act 1974 and the COSHH Regulations 2002, with ACoP L8 as the code. A simple flat with a combi boiler is often manageable; tanks, stored hot water or an HMO usually justify a professional legionella risk assessment.

Let’s be honest: property management is increasingly expensive. Between rising mortgage rates, stricter EPC regulations, and ever-changing HMO licensing fees, landlords are constantly looking for ways to cut costs. When it comes to water hygiene, the most common question we get asked is: "Can I just do the Legionella Risk Assessment myself and save the money?"

Prefer a professional legionella risk assessment? Service page · Get a quote

The short, direct answer is yes. Under the Health and Safety Executive's (HSE) guidelines, there is no explicit law stating that you must hire an external contractor to conduct a Legionella Risk Assessment.

However, before you print off a free template from the internet and walk around your rental property turning taps on and off, you need to understand exactly what you are taking on. By choosing to do it yourself, you are legally assuming 100% of the liability if something goes wrong.

💧 Check Your Property’s Risk: Not sure if your water system is actually a hazard? Use our Free Legionella Risk Calculator to find out instantly.

The "Competent Person" Catch

The HSE Approved Code of Practice L8 (ACoP L8) is the rulebook for managing Legionella. It states that the duty holder (the landlord) must appoint a "competent person" to carry out the assessment.

The HSE defines competency very strictly. To be deemed competent in a court of law, you must have sufficient training, experience, knowledge, and equipment to properly identify water system hazards. If you do not possess these, you cannot legally act as the competent person.

What Does a Proper Assessment Actually Involve? A legally defensible Legionella assessment is not a visual check. If you attempt it yourself, you must be prepared to execute and record the following:

Temperature Profiling: Using a calibrated digital probe, you must prove that cold water at the sentinel taps stays below 20°C within two minutes, and hot water reaches at least 50°C within one minute.
Identifying Dead Legs: You must physically trace the pipework to find redundant, capped-off pipes where water can stagnate and breed bacteria.
Inspecting Cold Water Storage: If the property has a loft tank, you must safely access it, check for biofilm, rust, or sediment, measure the stored water temperature, and verify the lid is secure against pests.
Assessing Aerosol Risks: Identifying every shower, spray tap, or external hose that could aerosolise contaminated water for a tenant to inhale.

The Cost of Getting it Wrong

If you undertake the assessment yourself to save the £90 - £150 fee typically charged by a professional, you are taking a massive gamble with your portfolio and your personal freedom.

If your DIY assessment misses a critical hazard—perhaps a dead leg hidden behind a stud wall, or a failing thermostat on a calorifier—and a tenant contracts Legionnaires' disease, you have no legal defence. Because you acted as the "competent person," you are entirely responsible for the negligence.

The Legal Consequences of a Failed DIY Assessment If an inspector or health official finds your self-assessment to be inadequate, you face:

HMO Licence Rejection: Local councils will actively reject HMO applications if they feel the submitted water hygiene reports lack professional rigour.
Unlimited HSE Fines: Fines for health and safety breaches are uncapped and based on your turnover.
Insurance disputes: If you face a civil injury claim from a sick tenant, expect your insurer to ask what assessment and controls were in place — check your policy wording.

The Verdict: Is it Worth the Risk?

While the law permits you to do it yourself, the reality is that the financial and legal risks far outweigh the minor upfront savings. Appointing a competent water hygiene assessor does not transfer your legal duty — you remain the dutyholder — but it gives you a documented, expert assessment to act on, and the assessor carries their own professional indemnity cover for their work.

Furthermore, maintaining full compliance across your portfolio usually requires more than just water testing. You are also legally required to maintain Health and Safety Audits, electrical checks, and, for many properties, Fire Risk Assessments. By using a professional network, you can often bundle these services together for a highly competitive rate, ensuring absolute peace of mind.

⚡ Electrical Safety: Your EICR is non-negotiable. Check your legal timeframe using our EICR Renewal Calculator.

🔥 Fire Safety: Do you need an FRA for your communal areas? Use our Free Fire Safety Scorecard to check.

Your 3 Steps to Water Safety Compliance

Hire a Competent Professional

Do not risk a DIY assessment. Use our network to request a competent, insured assessor with calibrated equipment.

Execute Remedial Actions

If the assessor identifies hazards—such as redundant pipework or uninsulated cold water tanks—hire a qualified plumber to rectify these issues immediately to protect your tenants.

Keep the Record Safe

Retain your professional Legionella Risk Assessment on file. You will need to produce this instantly if requested by the HSE, your local council licensing board, or your insurance provider.

Ready to book your Assessment?

Request a quote through our nationwide network via the quote form.

Guidance only — not legal advice. Requirements depend on the premises and enforcing authority. Arrange a formal on-site assessment where needed.

A proportionate DIY method for simple lets

If you proceed yourself on a simple domestic system, work from ACoP L8 and HSG274: describe the system, check temperatures at sentinel outlets, identify little-used outlets and showers, inspect tanks where present, remove or flush dead legs, and write down controls and review triggers.

When DIY is the wrong call

HMOs, shared showers or vulnerable occupants.
Stored water, solar thermal or complex secondary returns.
You lack a calibrated thermometer or cannot access tanks safely.
A council, agent or insurer has already rejected a previous template.

Typical matched domestic assessments are about £90–£180; HMO/complex £150–£350. Legionella service · Get a quote. Pair with a fire risk assessment where the stock needs one.

Primary sources

HSE legionella · ACoP L8 · HSG274
HSWA 1974 · COSHH 2002