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Construction compliance guide

Lone Working in Construction: Risks and Procedures

Thousands of builders work alone every day — on domestic jobs, remote sites, and out-of-hours call-outs. Here is what the law requires, what risks to watch for, and how to stay safe when nobody else is around.

What is lone working in construction?

Lone working means carrying out work tasks without direct supervision or the presence of other workers who could provide immediate assistance in an emergency. In construction, lone working is extremely common. Sole traders carrying out domestic extensions, kitchen fits, bathroom refurbishments, and loft conversions routinely work alone for full days. Sub-contractors may be the only person on a remote site. Maintenance workers attend call-outs alone. Even on larger projects, individual trades may be working in isolated parts of a building where no one else can see or hear them.

The HSE defines a lone worker as someone who works by themselves without close or direct supervision. That covers sole traders working on domestic jobs, employees sent to work on their own at a location away from their base, workers on sites where they are physically isolated from colleagues, and anyone working out of normal hours when no one else is present. Lone working is not inherently unsafe — but it does create additional risks that must be identified and managed.

What the law says — Management of Health and Safety at Work Regulations 1999

There is no single piece of legislation dedicated to lone working. Instead, the duty to manage lone working risks comes primarily from the Management of Health and Safety at Work Regulations 1999, which require employers to carry out a suitable and sufficient assessment of the risks to the health and safety of their employees and anyone else affected by their work. That duty explicitly includes assessing risks that arise from working alone.

The Health and Safety at Work etc. Act 1974 also applies — it places a general duty on employers to ensure, so far as is reasonably practicable, the health, safety, and welfare of their employees. For the self-employed, the Act requires you to conduct your work in a way that does not put yourself or others at risk.

The HSE has published specific guidance on lone working (INDG73), which makes clear that employers must identify the hazards of the work, assess the risks to lone workers, and put measures in place to avoid or control those risks. The guidance applies equally to the self-employed assessing their own risks. The key point is that lone working does not change what tasks you can do — it changes the risk profile of those tasks, because help may not be immediately available if something goes wrong.

Risk assessment for lone workers

A standard risk assessment may not adequately cover the additional risks created by lone working. When someone is working alone, the consequences of many hazards become more severe — not because the hazard itself changes, but because the response to an incident is delayed. A cut from an angle grinder that would be quickly treated with a colleague present could become life-threatening if the worker is alone and cannot reach a phone.

Your lone working risk assessment should consider these additional factors:

  • Can the task be done alone safely? Some tasks should never be done by a lone worker. Confined space entry, certain work at height, live electrical work, and structural demolition all require a second person present.
  • Site access and location. Can emergency services find and reach the site quickly? Is the working area remote, below ground, or in a location with poor mobile signal?
  • Communication. Does the worker have a reliable means of raising the alarm? Is there mobile phone signal? Is a check-in schedule in place?
  • Medical fitness. Does the worker have any medical conditions that could cause sudden incapacity? Epilepsy, heart conditions, insulin-dependent diabetes, and similar conditions increase the risk profile of lone working.
  • Violence and security. Is the worker visiting occupied domestic properties, carrying valuable tools, or working in isolated areas where they could be vulnerable?
  • Competence and experience. A lone worker needs to be experienced enough to make safe decisions without supervision. Less experienced workers should not be left to work alone on unfamiliar tasks.

Tasks that should never be done alone

While most construction tasks can be carried out by a lone worker with appropriate controls, some activities carry risks that are incompatible with working alone. If something goes wrong during these tasks, the worker may be unable to help themselves, and delayed rescue can be fatal:

Confined space entry

The Confined Spaces Regulations 1997 require rescue arrangements to be in place before entry. In practice, this means having a trained person stationed outside the confined space at all times. Atmospheric hazards, engulfment, and loss of consciousness can incapacitate a worker in seconds.

Working at height with fall-arrest systems

If a worker falls while wearing a harness, they can develop suspension trauma within minutes. A second person must be present to initiate rescue. Working at height on fragile roofs or near unprotected edges also demands a second person to raise the alarm.

Live electrical work

Electrocution can cause cardiac arrest, and the victim will be unable to help themselves. A second competent person must be present to isolate the supply and provide emergency first aid. Most live electrical work should be avoided entirely where possible.

Structural demolition

Demolition work creates unpredictable collapse risks. A lone worker caught in a collapse has no one to raise the alarm or begin rescue. Demolition should always be supervised.

Excavation work with collapse risk

Trench collapse can bury a worker completely in seconds. Rescue must begin immediately to have any chance of success. A lone worker in a collapsed trench has no way to call for help.

Communication and check-in procedures

The single most important control for lone working is a reliable communication and check-in procedure. If a lone worker is injured, taken ill, or incapacitated, someone needs to know about it quickly. Delayed response is what turns manageable incidents into fatalities.

A buddy system is the simplest approach. Two sole traders or colleagues agree to check in with each other at set intervals — typically every one to two hours depending on the risk level. A missed check-in triggers a phone call. No answer triggers the agreed escalation procedure — sending someone to the site or calling the emergency services.

Lone worker devices and apps offer more sophisticated monitoring. Most include timed check-in alerts, panic buttons, man-down detection that triggers automatically if the device senses a fall or prolonged inactivity, and GPS location sharing so that emergency responders know exactly where you are. Some connect to 24/7 monitoring centres that can dispatch help on your behalf.

Whichever approach you use, the procedure must be written down and agreed before work starts. The lone worker must know the check-in schedule, and the person receiving the check-ins must know the escalation procedure if one is missed.

Emergency procedures and security risks

Emergency procedures for lone workers need to account for the fact that the worker may not be able to summon help themselves. Your emergency plan should cover how the alarm will be raised if the worker is incapacitated, who will respond and how quickly they can reach the site, what first aid equipment is available on site, and how emergency services will find the location. Make sure the lone worker carries a charged mobile phone at all times, has the site address and postcode written down or saved for giving to emergency services, and knows the location of the nearest A&E department.

Violence and security risks are often overlooked in construction lone working assessments, but they are real. Builders working alone in occupied domestic properties can face confrontation from homeowners or other occupants. Workers on isolated sites may be targeted for theft of tools and materials. Out-of-hours working in unfamiliar areas increases vulnerability. Your risk assessment should consider whether the worker could be at risk of aggression or violence, and what steps can be taken — such as letting someone know your location, avoiding carrying large amounts of cash, securing tools in a locked vehicle, and having a clear procedure for leaving a situation that feels unsafe.

How The Site Book handles lone working in RAMS

Lone working is a hazard that applies to a huge proportion of construction projects, particularly domestic work carried out by sole traders and small teams. The Site Book recognises this and handles it automatically.

When you describe your project, The Site Book identifies whether lone working is likely — based on the type of work, the site setup, and the team size. If lone working applies, it flags the hazard in your risk assessment and includes appropriate control measures: check-in procedures, communication requirements, emergency arrangements, and restrictions on high-risk tasks that should not be done alone.

The result is RAMS that already account for lone working risks on your project — with the right controls, emergency procedures, and task restrictions built in. You review it, adjust for your specific circumstances, and download a professional document that demonstrates you have properly considered lone working as part of your safety planning.

Frequently asked questions

Common questions builders ask about lone working in construction.

Is it legal to work alone on a construction site?

Yes, it is legal to work alone on a construction site. There is no general prohibition on lone working in UK health and safety law. However, the Management of Health and Safety at Work Regulations 1999 require employers and the self-employed to assess the risks of all work activities, including those carried out by lone workers. The key legal requirement is not that you must never work alone, but that you must have assessed the risks that arise specifically because someone is working alone and put appropriate controls in place. For sole traders doing domestic work — extensions, loft conversions, kitchen fits — lone working is the norm. That does not exempt you from the duty to assess risks. You still need to consider what could go wrong, how you would get help in an emergency, and whether there are any tasks on the job that should not be done alone. There are specific tasks where lone working is either prohibited or strongly advised against, such as confined space entry and certain live electrical work. But for the majority of construction tasks, lone working is permissible provided the risks have been properly assessed and managed. The HSE expects to see evidence that you have considered lone working risks as part of your overall risk assessment for the project.

What tasks should never be done by a lone worker?

Several high-risk construction tasks should never be carried out by a lone worker. Confined space entry is the most clear-cut — the Confined Spaces Regulations 1997 require that rescue arrangements are in place before anyone enters a confined space, and that effectively means having someone else present. Working at height where there is a risk of suspension trauma from a fall-arrest harness also requires a second person to carry out rescue. Live electrical work should never be done alone because the risk of electrocution means someone must be present who can isolate the supply and administer first aid. Demolition work, particularly structural demolition, creates unpredictable risks that require supervision and the ability to raise an alarm immediately. Work involving the disturbance of asbestos-containing materials requires specific controls and monitoring that are incompatible with lone working. Hot works such as cutting and welding in enclosed or high-risk areas need a fire watch, which means a second person. Excavation work where there is a risk of collapse should not be done alone because a buried worker needs immediate rescue. As a general rule, if a task has the potential for a sudden incapacitating injury — one where you could not call for help yourself — it should not be done alone.

What should a lone working risk assessment cover?

A lone working risk assessment should cover all the additional risks that arise specifically because the person is working alone, on top of the standard hazards for the task itself. Start with the work environment — is the site remote or difficult to access? Could emergency services find and reach the worker quickly? Consider the tasks being carried out — are any of them high-risk activities that should not be done alone? Assess the worker’s medical fitness — do they have any conditions that could cause sudden incapacity, such as epilepsy, heart conditions, or diabetes that could lead to a hypoglycaemic episode? Look at communication — does the worker have reliable mobile signal, and is there a check-in procedure in place? Consider violence and security risks — is the worker visiting occupied properties, working in isolated locations, or carrying valuable tools and materials? Assess the worker’s competence and experience — a lone worker needs to be sufficiently experienced to make safe decisions without supervision. Finally, cover emergency procedures — what happens if the worker is injured, taken ill, or does not check in at the agreed time? Who raises the alarm, and what is the response plan? The assessment should be specific to the site and the tasks, not a generic template.

How often should lone workers check in?

There is no fixed legal requirement for check-in frequency, but the HSE expects the interval to be proportionate to the risks involved. For most construction work, a check-in every two hours is a reasonable starting point. For higher-risk tasks — working at height, using power tools, working in hot weather — you should increase the frequency to every hour or even every 30 minutes. The check-in does not need to be complicated. A phone call, a text message, or an automated check-in through a lone worker app all count. What matters is that there is a defined person receiving the check-in, that person knows what to do if a check-in is missed, and the worker knows the schedule and sticks to it. A buddy system is the simplest approach — two sole traders working on separate jobs who agree to check in with each other at set times. If a check-in is missed, the agreed response should be to call the worker. If there is no answer, the next step should be to send someone to the site or call the emergency services. The escalation procedure needs to be agreed in advance, not worked out on the day. Lone worker devices and apps can automate this process, with timed alerts, man-down detection, and GPS location sharing.

Do I need a lone worker device or app?

You are not legally required to use a dedicated lone worker device or app, but they can be an effective way of managing the risks. The law requires you to have appropriate arrangements in place for monitoring lone workers and responding to emergencies — how you achieve that is up to you. For many sole traders and small builders, a mobile phone and a buddy system with agreed check-in times is sufficient, provided the mobile signal is reliable at the site. However, a dedicated lone worker app or device offers advantages that a basic phone call does not. Most lone worker apps include timed check-ins with automatic alerts if you do not respond, a panic button for emergencies, man-down detection that triggers an alarm if the phone detects a fall or prolonged lack of movement, and GPS location sharing so that whoever is monitoring you knows where you are. Some devices also offer direct connection to a 24/7 monitoring centre that can dispatch emergency services on your behalf. The cost of a lone worker app is typically between five and fifteen pounds per month, which is modest relative to the protection it provides. If you regularly work alone on construction sites, particularly on remote or isolated jobs, a lone worker app is a sensible investment. It does not replace a proper risk assessment and check-in procedure, but it adds an extra layer of protection.

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Related guides

Risk Assessment in Construction

How to write a risk assessment that actually protects your team.

Working at Height

Rules, risks, and what you need to know about the Work at Height Regulations 2005.

Confined Spaces

Entry procedures, atmospheric monitoring, and rescue arrangements for confined space work.

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