--- title: "Do you need a Legionella risk assessment for a holiday let or Airbnb?" source_url: https://legionella.io/articles/do-you-need-a-legionella-risk-assessment-for-a-holiday-let-or-airbnb/ canonical_url: https://legionella.io/articles/do-you-need-a-legionella-risk-assessment-for-a-holiday-let-or-airbnb/ pillar: "Building Types & Use Cases" summary: "Short-let owners: yes, you have a Legionella duty, and the gaps between guests are the real risk. What an assessment covers and how to control voids." primary_keyword: "Legionella risk assessment holiday let" date_published: 2026-02-07 date_reviewed: 2026-06-26 author: "Legionella.io editorial team (REMOTE TECH LTD)" reviewed_against: "HSE L8 and HSG274 guidance" region: "United Kingdom" license: "(c) REMOTE TECH LTD. Quote freely with attribution and a link to source_url." --- # Do you need a Legionella risk assessment for a holiday let or Airbnb? Yes. If you let a property short-term, you are responsible for the water systems in it, and you have a duty to assess and control the Legionella risk [1]. The format is proportionate, not a thick document, but the duty is real and it does not switch off because the place is "only a cottage" or "only let in summer". The part most owners miss is not the assessment itself. It is the gap between guests. A holiday let spends large stretches empty, water sits warming in pipes and tanks, and then a new family arrives and runs the shower hot. That cycle is exactly what Legionella likes. This is the honest version of what you need and, more usefully, what control looks like between bookings. ## The short-let questions owners actually search ### Is a Legionella risk assessment a legal requirement for a holiday let? You will not find a law that says "thou shalt have a Legionella certificate for an Airbnb". What exists is a general duty. Anyone who lets a property, including short-term and holiday lets, has to assess and manage the risk from Legionella in the water systems they control, under health and safety law and the ACoP L8 framework [1][2]. So the requirement is to understand and control the risk, evidenced by an assessment, not to buy a branded certificate. A modest, mains-fed flat used most weeks may carry very little risk once assessed. A rural cottage with a loft tank, a long pipe run to an outbuilding shower and weeks of vacancy is a different conversation. ### Who is responsible, the owner or the platform? You are, as the person who controls the property and its water system. Airbnb, Vrbo or a booking site is a marketplace, not a duty holder for your plumbing. If you use a managing agent or housekeeping company, you can delegate tasks such as flushing and temperature checks, but the legal responsibility to make sure it happens stays with you as the owner or operator [1]. The pragmatic call: write down who does what, and keep the proof. "The cleaner runs the taps" is not a control unless it is recorded and you can show it. ### What does a holiday-let Legionella risk assessment actually cover? A competent assessment, following the approach in HSG274 and BS 8580-1, looks at the real system in front of it [2]. Expect it to cover the water source, any storage tanks and the hot-water cylinder or calorifier, the pipework layout, and the outlets, paying particular attention to features that raise risk: dead legs, infrequently used outlets, showers that create spray, and stored tepid water [6]. For a short let it should also address the thing that makes short lets distinctive: occupancy. The assessment should set out how the system is managed during void periods and at changeover, not just on the day someone surveys it. It then records the controls, who carries them out, and how often you review the whole thing. ### Why are the gaps between guests the real risk? Because stagnation does the damage. When nobody is staying, water stops moving. Cold water drifts up toward room temperature and hot water in pipes cools into the range where Legionella multiplies fastest [4]. A property let every weekend self-flushes fairly well. One let for a fortnight in July and then shut until October does not. In my view this is where short lets are genuinely higher-risk than a normal tenancy: the wide, irregular swings between full use and total silence. A standing tenant uses the water daily without thinking. A holiday let can sit dead for weeks, then deliver a hot, aerosol-generating shower to a stranger within an hour of arrival. ### What does control between guests look like in practice? Flushing is the workhorse. The general expectation is that infrequently used outlets are run regularly to draw fresh water through and stop it standing; your risk assessment sets the exact interval for your property [5][6]. For a let standing empty, that commonly means flushing through every outlet, hot and cold, on a defined schedule and again as part of changeover before the next guest. A workable changeover routine, folded into the clean: - Run each tap and shower for long enough to clear standing water, hot then cold, with the shower head low to limit spray. - Check that hot runs genuinely hot and cold genuinely cold at representative outlets [4]. - Descale or replace shower heads and hoses periodically, since scale and biofilm shelter bacteria. - Record each visit, with date and initials, so you have audit-ready evidence rather than a memory. That last point is where paper diaries quietly fail. A digital logbook that timestamps each flush and temperature check, and flags a missed void-period task, turns "I think the cleaner did it" into something you can actually show. ### Do hot tubs and spa pools change the answer? Significantly. A hot tub or spa on a holiday let is one of the highest-risk water features you can offer, because warm, aerated, recirculated water is close to ideal for Legionella and is breathed in as fine spray [6]. These systems sit under specific guidance in HSG282 and need their own regime of disinfection, water testing and records, well beyond running a tap [8]. The blunt version: if you advertise a hot tub, treat it as a managed engineering system with its own controls and competent oversight, not a garden luxury you top up between guests. ### Do I need to test the water for Legionella? Usually not as a routine. Sampling is reserved for specific circumstances your risk assessment identifies, such as where control is hard to demonstrate or temperatures cannot be reliably maintained, rather than something every holiday cottage does on a calendar [5]. Spa pools are the notable exception, where regular sampling is part of the regime [8]. Treat anyone cold-calling to sell you routine annual "Legionella testing" for a standard let with caution. The control is the assessment plus consistent temperature and flushing management, not a sample bottle. ### Can I do the assessment myself, or do I need a professional? The law asks for a competent person, which means someone with the knowledge, training and experience to assess your specific system, not necessarily an outside consultant [1][2]. A confident owner with a simple, modern, mains-fed flat may reasonably do and record a proportionate assessment themselves after reading the HSE guidance. The pragmatic call: bring in an external competent person where the system is more complex, where you genuinely cannot judge the risk, or where there is a hot tub, a loft tank, long void periods or shared supplies in the mix. If you appoint a contractor, the Legionella Control Association code of conduct is a reasonable benchmark for who you let near it [9]. ## If you only do one thing Map your void periods against your flushing. Pull up the next three months of bookings, mark every gap longer than your risk assessment allows water to stand, and put a dated flush in each one with a name against it. This is general guidance, not a survey of your building. Legionella risk turns on the actual pipes, tanks and usage pattern of your specific let, so the figures and intervals here only become real once a competent, site-specific risk assessment sets them for your property. Today's concrete step: list your outlets and storage on one sheet, note when each was last run, and start logging every changeover flush and temperature check. Moving that record off a kitchen-drawer notebook into a digital logbook is what turns scattered good intentions into evidence you can stand behind if anyone ever asks. ## Related reading - [Legionella control in residential rental properties](https://legionella.io/articles/legionella-control-in-residential-rental-properties/) - [Landlord responsibilities for Legionella in rental properties](https://legionella.io/articles/landlord-responsibilities-for-legionella-in-rental-properties/) - [Seasonal buildings: managing intermittently used properties](https://legionella.io/articles/seasonal-buildings-managing-intermittently-used-properties/) ## Sources [1] HSE, "Legionella and landlords' responsibilities". https://www.hse.gov.uk/legionnaires/legionella-landlords-responsibilities.htm [2] HSE, "Legionnaires' disease: Technical guidance (HSG274)". https://www.hse.gov.uk/pubns/books/hsg274.htm [4] HSE, "Hot and cold water systems". https://www.hse.gov.uk/legionnaires/hot-and-cold.htm [5] HSE, "Testing and monitoring your water system for legionella". https://www.hse.gov.uk/legionnaires/testing-monitoring-water-system.htm [6] HSE, "Systems most likely to create legionella risk". https://www.hse.gov.uk/legionnaires/risk-systems.htm [8] HSE, "Control of legionella and other infectious agents in spa-pool systems (HSG282)". https://www.hse.gov.uk/pubns/books/hsg282.htm [9] Legionella Control Association, "Code of Conduct for Service Providers". https://www.legionellacontrol.org.uk/