Legionella Duties For UK Holiday Lets And Airbnbs: What Owners Need To Know

Owners of holiday lets and Airbnbs do have responsibilities for controlling Legionella risk. The exact duty depends on who controls the premises, the water systems and the day-to-day arrangements, but short-term occupancy does not remove the need to manage the risk. The phrase legionella and holiday lets matters because guests may arrive after long periods with little or no water use, then use showers, baths and hot tubs immediately.

A property can look clean, well maintained and ready for guests while its water hygiene arrangements are weak. Reports may be filed away without anyone checking whether recommendations were completed. A cleaner can reset the accommodation, but that does not make them responsible for water safety unless the role has been clearly assigned and properly managed.

For most owners, sensible control starts with understanding the water systems, assessing the risk, managing periods of vacancy, keeping suitable records and making sure contractors or agents know what they are expected to do.

Do UK Holiday Lets Have Legionella Responsibilities?

Yes. A holiday let is not automatically exempt from Legionella control requirements because guests stay for only a few nights or because the property is operated through an online booking platform.

Under the Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations 2002, duties can apply to people who control premises or systems used by others. The Health and Safety Executive’s approved code of practice, Legionella regulations and guidance, including ACOP L8 and HSG274, sets out the established approach for assessing and controlling the risk.

The legal position is risk-based. There is not a universal rule requiring every small holiday cottage to commission the same assessment, install the same equipment or keep an identical monitoring file. The owner or person in control needs to understand the relevant systems and take reasonable measures proportionate to the risk.

That usually means considering:

• The type and size of the hot and cold water systems
• How often the property is occupied and how long it stands empty
• Showers, baths, spa pools, hot tubs or other aerosol-generating outlets
• Stored hot water, cold water tanks, secondary return systems and little-used outlets
• The age, condition and complexity of the plumbing
• Whether guests, cleaners, maintenance staff or contractors may be exposed
• Whether anyone using the property may be more vulnerable to serious illness

For a simple property with a small, direct-fed water system, the controls may be relatively uncomplicated. A larger house split into multiple units, a property with stored water, a swimming pool or a hot tub needs closer attention. A risk assessment should reflect the actual building rather than being copied from a different property in the owner’s portfolio.

Owners should also distinguish between a legal duty to control risk and an expectation to hold particular paperwork. A written Legionella risk assessment is often the clearest way to demonstrate that the risk has been considered, especially where systems are more complex, records are incomplete or responsibility is shared. It is not a substitute for carrying out the controls identified in it.

Why Intermittent Occupancy Increases the Risk

Water systems are designed to be used, but holiday accommodation often experiences an irregular pattern of demand. A property may be occupied heavily over a bank holiday, left empty for several weeks, opened for cleaning, then occupied again by a new group. That pattern creates conditions in which water can stagnate and temperatures can drift away from effective control ranges.

Further guidance can be found in the legionella ACOP L8 requirements.

Legionella bacteria can multiply where water is stored or held at temperatures that support growth, particularly when there is stagnation, sediment, scale or biofilm. Exposure usually occurs when contaminated water is released as fine droplets, most commonly through showers or similar outlets. The risk is not created simply because a property is empty, but vacancy can weaken the normal controls.

Common risk points include:

• Hot water cylinders that are not heated regularly
• Cold water tanks with low turnover or poor insulation
• Guest bathrooms used only at weekends
• En-suite rooms that remain closed between bookings
• Outside taps, utility sinks or other little-used outlets
• Long pipe runs serving an extension or converted room
• Hot tubs and spa equipment that are drained, refilled or maintained inconsistently

A particular problem arises when a property is prepared for arrival by running taps briefly or flushing toilets, without a planned procedure covering all outlets and the hot water system. A quick turnover clean may deal with visible surfaces while leaving the underlying water system unmanaged.

There is no single vacancy period that automatically makes a property unsafe. The appropriate response depends on the design of the system, the duration of the shutdown, the temperature control, the outlets present and the actions taken before reoccupation. A documented procedure for reopening after vacancy is far more useful than relying on a cleaner’s judgement at the start of each booking.

For properties with more complex arrangements, HSG274 hot and cold water systems guidance can help inform the control strategy. The owner should use competent advice where the system cannot be understood or managed confidently from the available records.

Who Is Responsible for Managing Legionella in a Short-term Let?

The responsible person is normally the individual or organisation with control of the premises or water systems. In a privately owned holiday let, that may be the owner. In other arrangements, responsibility may sit with a landlord, managing agent, property management company, tenant or another party under the contract.

Putting a property on Airbnb does not transfer the duty automatically to Airbnb. The platform facilitates bookings, but it normally does not manage the building’s plumbing, temperature controls, maintenance arrangements or guest instructions.

Responsibility can become unclear where several parties are involved. An owner may appoint an agent to arrange bookings, a cleaner to turn the property around, a plumber to service the boiler and a hot tub contractor to maintain spa equipment. Each appointment may be commercially sensible, but the owner still needs to know who is making decisions and who is checking that work has been completed properly.

A written agreement should identify, where relevant:

• Who has overall control of the property and water systems
• Who arranges the risk assessment and reviews it after changes
• Who carries out routine flushing, temperature checks or other monitoring
• Who manages reopening after vacancy
• Who maintains showers, cylinders, tanks, hot tubs and treatment equipment
• Who records failures and assigns corrective actions
• Who reviews contractor reports rather than simply filing them

Delegating a task is not the same as transferring accountability. If an agent is expected to manage the controls, the owner should confirm that the agent has the competence, time, instructions and resources to do so. A contract that says the agent will deal with compliance, without defining the work, leaves too much room for assumptions.

One issue seen regularly is a landlord believing that a maintenance contractor has “covered Legionella” because a boiler service was completed. Boiler servicing is not the same as a water hygiene assessment. The contractor may have checked combustion and safety controls without assessing outlets, storage, stagnation or guest exposure.

What Controls Should a Holiday Let Owner Have in Place?

The right controls depend on the property and the water system. A useful starting point is a current assessment that identifies the systems, outlets, risk factors, existing controls and actions still outstanding.

A proportionate management arrangement may include the following.

Understand the Water System

Keep enough information to identify how water enters, is stored, heated and distributed around the property. This may include the incoming supply, cold water storage tanks, hot water cylinders, boilers, secondary returns, showers, baths, taps and external outlets.

Plans do not need to be elaborate for a simple property, but they should be accurate. If an extension has been added, a bathroom converted or a hot tub installed, the old description may no longer be reliable. Areas such as loft tanks, plant cupboards and service ducts are often omitted because they are inconvenient to access, yet those locations may contain the equipment that determines the risk.

Control Hot and Cold Water Temperatures

Temperature is one of the principal controls for domestic hot and cold water systems. Hot water should be stored and distributed in a way that supports effective control, while cold water should be kept suitably cool. The precise checks and frequencies should follow the system design and the recommendations of the risk assessment.

Temperature checks are only useful if someone reviews the results and acts on failures. A spreadsheet showing low readings over several weeks is not an effective control if nobody investigates the cause. Possible causes include faulty thermostatic mixing valves, poor insulation, excessive dead legs, low usage or a heating system that is not operating as expected.

Manage Outlets During Vacancy

Set out what happens when the property is empty and what happens before guests arrive. This may involve flushing outlets, checking temperatures, cleaning or disinfecting components, and confirming that hot tubs or other specialist systems are safe to use.

The procedure should cover every relevant outlet, not only the main bathroom. Little-used sinks, showers in locked rooms, utility areas and outside taps can be missed during a rushed changeover. The person completing the work should know what to do if an outlet cannot be accessed or a control check fails.

For example, if a Friday arrival follows three unoccupied weeks, the reopening checklist should identify the responsible person, the sequence for outlets and any required delay before use. Simply ticking “water run” does not show which outlets were flushed or whether a shower hose and head were treated safely. A failed hot-water reading should trigger escalation to the owner or contractor, with the booking decision considered rather than quietly marked complete.

Maintain Showers and Specialist Equipment

Showers can generate aerosols and should be kept clean, maintained and used in accordance with the assessment. Shower heads and hoses may need periodic cleaning and descaling, particularly where scale builds quickly.

Hot tubs, spa pools and similar equipment require their own management arrangements. They are not controlled simply by flushing domestic taps. Water treatment, filtration, disinfection, testing, records and user information all need to be considered. If the equipment is drained between bookings, the refill and recommissioning process should be defined rather than improvised.

Where a hot tub is unavailable because a disinfectant or test result is outside the specified range, staff should have clear authority to prevent guest use and explain the restriction. This is both a health control and an operational decision: reopening a tub to protect a booking can expose guests and create complaints, reporting duties or enforcement attention if illness is later suspected.

Keep Records That Can Be Relied On

Records should show what was checked, when it was checked, who completed it, what result was obtained and what happened when the result was outside the expected range. Keep the current assessment, system information, monitoring records, maintenance certificates, cleaning records and action tracker together.

The purpose is not to create paperwork for its own sake. Records help the owner spot deteriorating controls and demonstrate that identified issues were managed. A file containing several contractor reports but no evidence that recommendations were reviewed is still a weak management system.

Owners should review the arrangements after plumbing alterations, installation of a hot tub, a change of managing agent, a significant period of closure, a recurring temperature failure or a change in the people using the property.

Common Gaps in Legionella Management for Airbnbs

Many short-term lets have some maintenance activity but no joined-up control process. The most common gaps are practical rather than technical.

• No clear record of who is the responsible person
• An old assessment that describes the property before refurbishment
• A report with missing appendices, system details or outlet lists
• Monitoring records that are incomplete or have not been reviewed
• Recommendations that remain open without an owner or completion date
• Vacancy flushing carried out inconsistently between bookings
• Cleaners asked to manage water controls without written instructions
• Hot tubs managed separately from the rest of the property without clear coordination
• Rooms, plant cupboards or outlets excluded because access was unavailable
• Reliance on a boiler service as evidence that Legionella risk is controlled

A further weakness is assuming that a standard operating procedure suits every property. Two cottages may have completely different systems. One may have a combi boiler and direct-fed outlets. The other may have a cylinder, loft tank, long pipe runs and a rarely used annexe. The second property needs a different assessment and different controls.

Short-term let owners also need to consider communication. Guests may not know that a shower has been unused for a month, that a hot tub has just been refilled or that an outlet has been taken out of service. Clear instructions can reduce misuse, but guest information does not replace technical control.

Where an agent manages several properties, portfolio-level templates can be useful for consistency, but they should not replace property-specific information. A register that lists every address but records no system differences may look organised while concealing the actual risk.

Poor practice can have consequences beyond an untidy compliance file. A guest complaint, suspected illness or inspection may lead to urgent investigation, temporary closure, remedial costs and reputational damage. If a cleaner records a task that was not completed, the issue is not merely administrative: the owner may be relying on false assurance when deciding whether to release the property for occupation.

When Should a Holiday Let Owner Arrange a Professional Assessment?

Professional support is sensible when the owner cannot confidently describe the water system, assess the exposure or show that controls are working. It is particularly useful where the property has stored water, multiple bathrooms, long pipe runs, vulnerable occupants, a hot tub or a history of recurring problems.

Arrange an assessment or review when:

• The property is newly acquired and the water records are missing or unreliable
• A building has been extended, converted or refurbished
• Bathrooms, showers, hot tubs or water heaters have been added
• The property has been vacant for an extended period
• Temperature checks are repeatedly outside the expected range
• There is evidence of scale, corrosion, poor insulation or dead legs
• Responsibility has moved from the owner to an agent or another operator
• A previous assessment contains vague actions or areas that were not accessed
• The property is used by people who may be more vulnerable to Legionnaires’ disease
• An insurer, lender, solicitor, contractor or business partner needs clearer evidence of control

An assessment should be based on the actual installation. The assessor needs suitable access to relevant plant, tanks, outlets and records. If a plant room is locked or a ceiling void cannot be inspected, that limitation should be recorded and resolved where it affects the conclusions.

The report should identify the responsible person, describe the system, explain the exposure routes, record existing controls and set out specific actions. “Improve monitoring” is not a useful recommendation on its own. A better action states what needs checking, who will do it and when it should be completed.

After the assessment, the owner still has to implement and review the controls. Commissioning a report and filing it without action is one of the more common failures in small accommodation businesses. The value lies in using the findings to manage the property between bookings, not simply in holding a document.

Practical Questions Holiday Let Owners Ask

Does Every Airbnb Need a Legionella Risk Assessment?

Not every property will need the same level of formal assessment. The requirement is to assess and control the risk in a way that reflects the premises and water systems. A written assessment is usually sensible where the system is complex, records are absent, responsibility is shared or the owner needs to demonstrate that the risk has been properly considered.

Who Is Responsible if a Managing Agent Runs the Property?

Responsibility depends on the actual control arrangements and the contract. An agent may carry out day-to-day tasks, but the owner should confirm who has overall responsibility, what the agent must do and how performance will be checked. The phrase “the agent deals with it” is not enough to establish a workable system.

What Should Happen After a Holiday Let Has Been Empty?

Follow a written reopening procedure suited to the water system. It may include flushing outlets, checking hot and cold water conditions, reviewing specialist equipment and recording the results before guests use the property. The procedure should state what happens if a check fails or an outlet cannot be accessed.

Are Hot Tubs Covered by the Same Arrangements?

Hot tubs need specific controls because warm, aerated water can create conditions that require careful treatment and monitoring. Domestic water checks alone are not enough. The equipment should have a suitable operating, cleaning, disinfection and testing regime, with records and clear instructions for anyone responsible for it.

How Often Should the Risk Be Reviewed?

Review it when the property, water system, occupancy pattern or management arrangements change, and whenever monitoring identifies a problem. A periodic review is also sensible even where nothing obvious has changed, because records, contractors and operating practices can drift over time.

If you own or manage a holiday let and need a property-specific assessment, clearer records or help resolving water hygiene issues after vacancy, Acorn Safety Services (Legionella) can review the arrangements and identify practical controls. Contact us to discuss the property, or Get a quote for the support required.