One of the most common misconceptions about lone working is that there's a specific law prohibiting it, or a single regulation that spells out exactly what you must do. There isn't. What exists instead is a set of general duties that apply to lone workers just as they apply to everyone else — and that, if anything, makes them easier to overlook. This is a plain-English walk through what the law and HSE guidance actually expect.
Working alone is legal — managing it badly is the problem
The Health and Safety Executive is clear that in most cases it is perfectly lawful to work alone. The obligation isn't to eliminate lone working; it's to make sure lone workers are not exposed to more risk than other employees, so far as is reasonably practicable. A few tasks are treated more strictly — certain confined-space or high-voltage work may effectively require a second person — but for the vast majority of jobs, the question is not "can they work alone?" but "have we managed the risks of them doing so?"
The duties that do apply
Two pieces of legislation do most of the work here.
The Health and Safety at Work etc. Act 1974
This sets the overarching duty to ensure, so far as is reasonably practicable, the health, safety and welfare of employees. "Welfare" is worth dwelling on — it isn't only about preventing injury, it's about the general wellbeing of someone you've asked to work in isolation.
The Management of Health and Safety at Work Regulations 1999
These require you to carry out a suitable and sufficient assessment of the risks your workers face, and to act on what it tells you. For lone workers, HSE guidance expects that assessment to specifically consider whether the work can be done safely by one person.
"Reasonably practicable" is the phrase that carries the weight. It means weighing the risk against the time, cost and effort of controlling it — and doing what a sensible employer would do. It does not mean "we couldn't think of anything", and it does not mean spending without limit.
What a "suitable and sufficient" assessment looks like
HSE guidance points employers towards a handful of practical considerations for lone work. Does the workplace present a special risk to someone on their own? Is there safe access and egress for one person? Can any equipment involved be safely handled alone? What happens if the person becomes ill, has an accident, or is threatened? And crucially — is there a way to keep in touch, and to summon help if it's needed?
You can see a practical structure for this in our risk assessment guidance, but the principle is simple: identify the situations, judge the real level of risk, and put proportionate controls in place.
Keeping in touch is an expectation, not a nicety
Communication runs through HSE's lone-working guidance as a recurring theme. Supervision doesn't have to mean physical presence, but there should be a means of staying in contact and a procedure for what happens when contact is expected and doesn't come. This is exactly where a structured system earns its place: a scheduled welfare check-in creates a predictable moment where a worker confirms they're fine, and a defined escalation procedure means a missed confirmation reaches a real person rather than being quietly missed.
Training, wellbeing and vulnerable workers
Guidance also expects that lone workers are competent to handle the situations they'll face on their own, including judging when to withdraw from a situation that feels unsafe. Some workers — new or young employees, expectant mothers, or anyone with a health condition — may not be suited to working alone at all, or may need additional safeguards. And the mental wellbeing of isolated workers is explicitly part of the picture, not an afterthought.
Recording it matters
If you have five or more employees you're required to record the significant findings of your risk assessment. Beyond the legal minimum, a clear record of the controls you put in place and the checks you actually carried out is what lets you demonstrate you took your responsibilities seriously — which is precisely the point of keeping an auditable trail of check-ins and escalations.
The honest summary
There's no lone-working law to comply with line by line, and that's exactly why it slips down the priority list. The general duties are unambiguous: assess the risk, control it proportionately, keep in touch, and be able to show what you did. Treating those as a genuine standard — rather than a box to tick — is what good practice looks like. If you want to see how the keeping-in-touch and escalation parts work in practice, our how it works page is the place to start.
This article is general guidance, not legal advice. For decisions about your specific obligations, consult the current HSE guidance and, where needed, a qualified health and safety professional.
