Landlords — Compliance
Legionella risk assessments for London landlords
A legal requirement for all landlords under HSE L8. Our engineers assess cold and hot water systems in rental properties across London and provide a written assessment report.
What is assessed
What a legionella risk assessment covers
Cold water storage tanks
Condition, temperature, debris, cover and insulation
Hot water cylinder temperature
Must reach 60°C to inhibit legionella growth
Pipework layout
Dead legs and infrequently used sections that allow water to stagnate
Shower heads and spray fittings
Biofilm build-up and cleaning frequency
Combi boiler and direct systems
Confirmation of low-risk status for simple systems
Tenant usage patterns
Occupancy, vacant periods and frequency of use
Common questions
Legionella: frequently asked
Is a legionella risk assessment a legal requirement for landlords?
Yes. The Control of Substances Hazardous to Health Regulations 2002 (COSHH) and the Health and Safety at Work Act 1974 require landlords to assess and control legionella risks in their properties. The HSE's L8 Approved Code of Practice sets out the duty.
How often does a legionella risk assessment need to be done?
There is no fixed statutory interval but the assessment should be reviewed whenever there is a change in the water system (new boiler, new pipework, new tenants) or after a period of property vacancy. For simple domestic systems, reviewing every 2 years is typical best practice.
Do I need a legionella risk assessment for a flat with a combi boiler?
Yes, but the risk is very low in properties with a combi boiler and no cold water storage tank. The assessment for such a property is simple and can often be completed by the landlord using HSE guidance, or by an engineer during a routine visit.
What increases the legionella risk in a rental property?
Higher risk factors include: cold water storage tanks (particularly old ones with sediment); hot water cylinders set below 60°C; long sections of rarely used pipework (dead legs); properties that are left empty for extended periods; and shower heads or spray fittings that are not cleaned regularly.
Combined compliance visit
Legionella + gas safety in one visit
We can combine a legionella risk assessment with the annual gas safety certificate visit, saving you time and a second access appointment.
Book combined visit