Legionella Risk Assessment
Quick answer
A written assessment of the risk of legionella bacteria in the property's water system. Required by HSE under the Control of Substances Hazardous to Health Regulations 2002. Not a formal certificate, but landlords must demonstrate they have considered the risk.
At a glance
- Required by
- HSE under COSHH 2002
- Form
- Written assessment (not a certificate)
- Frequency
- Review when circumstances change
Full guide
Read the complete landlord guide on Legionella Risk Assessment
Deadlines, fines and step-by-step compliance in our in-depth resource.
Open full guideWhy Legionella Risk Assessment matters for landlords
Legionella is a low-probability, high-consequence hazard — an outbreak is rare but a death is prosecutable under HSE legislation. Most small residential properties are low-risk (cold water tanks drained, regular use) but the landlord still has to produce a dated written assessment showing they considered it. A one-page risk assessment kept in the property file closes the duty.
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Related terms
Landlord and Tenant Act 1985 (Section 11)
The cornerstone repair-obligation statute for residential lets in England and Wales. Section 11 implies into every short-term residential tenancy a landlord obligation to keep in repair the structure and exterior of the property, and to keep in repair and proper working order the installations for water, gas, electricity, sanitation, space heating and water heating. Cannot be contracted out of. Breach is the basis for tenant disrepair claims and Awaab’s Law SLA enforcement under the Renters Rights Act 2025.
Article 4 Direction
A planning tool councils use under article 4 of the Town and Country Planning (General Permitted Development) Order 2015 to remove permitted-development rights, most commonly the right to convert a single-family home (Use Class C3) into a small HMO (Use Class C4) without planning permission. In an Article 4 area, every C3 → C4 conversion needs a full planning application, and operating without it can trigger an enforcement notice, a planning contravention notice or a refusal of HMO licence.
Banning Order
A court order under Part 2 of the Housing and Planning Act 2016 banning a person convicted of certain housing offences from letting property, engaging in lettings agency work or holding an HMO licence. Triggered by a banning-order offence (Schedule 1 of the Act): includes serious housing-condition offences, illegal eviction and unlawful HMO operation. A banned landlord is added to the national database of rogue landlords and breach of the order is itself a criminal offence with up to 51 weeks’ imprisonment.
Civil Penalty Notice
A financial penalty up to £30,000 a local housing authority can impose as an alternative to criminal prosecution under the Housing and Planning Act 2016, the Housing Act 2004 (HMO offences) and various tenancy offences. Common triggers: failure to comply with an Improvement Notice, breach of HMO licensing, unlawful eviction, breach of selective licensing or letting an unsafe property. The landlord can appeal to the First-tier Tribunal within 28 days; unpaid penalties are recoverable in the County Court.
Council Tax
The tax charged on residential property by the local authority. Tenants are usually liable while the property is let as their main residence. Landlords become liable during void periods and for most HMOs (where each tenant has their own AST).
Decent Homes Standard (DHS)
A government standard for minimum housing quality: free of Category 1 HHSRS hazards, in a reasonable state of repair, with reasonably modern facilities and reasonable thermal comfort. It currently applies to social housing. The Renters’ Rights Act 2025 provides the power to extend it to the private rented sector, but the regulations have not been made — the Government’s implementation roadmap proposes 2035 or 2037, so it is not a duty on private landlords today.