Par Syed Muhammad Daud Rizvi — Cofondateur de TapOkie Work. Pointages de visite et suivi audit-ready pour travailleurs isolés dans de petites équipes — sans lock-in enterprise.
Construction employers must risk assess all lone working scenarios — including site opens, closures, and remote groundwork — and implement proportionate monitoring: documented check-ins, an escalation chain that covers out-of-hours work, and records that demonstrate HSE compliance. Generic buddy systems often fail at the margins; a monitoring tool that creates timestamped session records provides the audit trail inspectors and insurers expect.
The lone working reality on construction sites
Construction is typically thought of as a team environment — crews working together, site managers circulating, subcontractors overlapping across the working day. But many construction sites also have consistent lone working exposures that sit at the margins of that team picture.
The site manager who opens up at 6am before anyone else arrives. The groundworker finishing an isolated section of drainage while the rest of the crew is 400 metres away. The engineer conducting a survey visit between phases. The security operative locking the site at dusk.
These are not unusual situations. They are everyday construction operations. And they create exactly the exposures that lone working legislation is designed to address: delayed discovery if something goes wrong, no one nearby to assist in a medical emergency, no ambient awareness that would flag an absence.
What the law requires
There is no lone-worker-specific regulation for construction in the same way that specific height or confined-space regulations exist. The duty derives from the general framework:
The Health and Safety at Work Act 1974 requires employers to ensure, so far as is reasonably practicable, the health, safety, and welfare of their employees. That duty applies to lone workers as to anyone else.
The Management of Health and Safety at Work Regulations 1999 require a suitable and sufficient risk assessment of all significant workplace hazards — including lone working — and require significant findings to be recorded in writing for employers with five or more employees.
CDM 2015 requires the principal contractor's construction phase plan to address how health and safety risks on the site will be controlled. Lone working hazards should feature in the risk register if they are significant.
HSE guidance (Working Alone: Health and Safety Guidance on Lone Working, INDG73) sets out the framework for assessing and managing lone working risks. It applies to construction the same as any other sector.
Common lone working scenarios in construction — and their specific risks
Site opens and closures
The person who unlocks or locks a construction site is often alone for a period that can range from a few minutes to an hour or more. On an active multi-contractor site, this is frequently the most senior person present — which means the escalation chain that normally involves their line management may not function at early or late hours.
Specific risks: slips, trips, or falls in low-light conditions; medical emergencies with no one to assist; incidents at the site boundary during perimeter checks; contact with residual plant or materials.
Remote groundwork and earthworks
Large earthworks or groundwork phases can have individuals operating plant or carrying out manual tasks at significant distances from any colleague. Mobile coverage may be intermittent. The noise of plant operation makes shouting for help ineffective.
Specific risks: plant rollover or instability, ground collapse in trench or excavation work, struck-by incidents with no witness, medical emergency (cardiac, heat, or cold-related) with delayed discovery.
Survey visits and pre-start inspections
Engineers, surveyors, and pre-construction professionals often visit sites alone — sometimes before construction has formally begun, with no other parties on site. These visits may not be booked into any team calendar in a way that creates natural accountability.
Specific risks: trips on uneven ground, contact with contaminated land, aggression at boundary areas, getting trapped in partially completed structures.
Utilities and confined space work
Utility connection work — gas, water, power — sometimes takes place in confined spaces or at depth, which creates a compounding risk profile when lone working. Confined space regulations have their own requirements; where lone working and confined space work intersect, the risk assessment must address both.
What monitoring controls should look like
The risk assessment
Write a lone working risk assessment that specifically covers each scenario in which construction workers may be alone. Do not assume that a generic site risk assessment covers this. Name the scenario, the hazard, the risk, the existing controls, the residual risk, and the additional monitoring control.
The monitoring control is typically: a worker checks in at the start of the lone working period and checks out at the end; a designated manager is alerted if the check-out is missed within an agreed time window; the escalation chain is named and tested.
The monitoring tool
For most construction lone working scenarios, a smartphone-based monitoring tool is appropriate. Workers start a session before the lone working period begins, set the expected duration, and end the session on completion. If the session runs over, a named manager receives an alert.
The tool does not need to be a high-cost ARC-connected system for the majority of construction lone working. What it does need to do is create timestamped records of sessions and alerts, notify named managers reliably, and be easy enough to use that workers actually run it every time.
TapOkie Work provides session-based monitoring where workers start and end sessions with a tap, managers see overdue sessions on a dashboard and receive alerts by email and push notification, and session history can be exported for HSE or principal contractor audits.
Out-of-hours escalation
The escalation chain that works at 9am may not work at 6am or 7pm. Name a backup manager or duty holder who is contactable during out-of-hours lone working periods. Include their direct mobile number. Test whether they actually receive alerts in the tool you are using.
If out-of-hours lone working is frequent or particularly high-risk, consider whether a third-party monitoring arrangement is more appropriate.
The construction phase plan
Where your site has a principal contractor, the lone working control measures should feature in the construction phase plan under the relevant hazard register. HSE inspectors reviewing the plan on site expect to see how identified hazards are controlled — including lone working where it has been identified.
Records to maintain
Keep the following records for each construction project that involves lone working:
- Lone working risk assessment, specific to the site and the scenario types present
- Lone worker policy (or reference to the organisation's policy) including the escalation chain
- Session logs from the monitoring tool — start time, end time, worker ID
- Records of any alerts — when they fired, who received them, how they were resolved
- Training records confirming workers and managers have been briefed on the process
- Post-incident review notes where any alert required follow-up
Three years is the recommended minimum retention for lone working records, consistent with RIDDOR record-keeping requirements.
The practical gap to close
The most common failure mode in construction lone worker monitoring is not that employers have no process — it is that the process only covers the middle of the working day. The early-morning opener and the late-close site manager often fall outside the formal lone working process simply because they have always been handled informally.
Review your actual working patterns, not just the nominal shifts. Identify the situations where someone is genuinely alone, regardless of whether that was intended when the working patterns were designed. Then extend the monitoring and escalation process to cover those situations.
Related reading
- Lone worker risk assessment for small teams
- How to write a lone worker policy
- Lone worker didn't check in: what managers should do
- UK lone worker legislation: employer duties explained
- Compliance hub
Questions fréquentes
Does CDM 2015 cover lone working?
CDM 2015 covers health and safety in construction broadly; lone working falls under the Health and Safety at Work Act 1974 and the Management of Health and Safety at Work Regulations 1999. The principal contractor's construction phase plan should reference how lone working hazards are controlled.
Are self-employed contractors covered by the lone worker duty?
Self-employed individuals have duties to themselves under health and safety law. Where a contractor is under the direction of a principal or main contractor, that employer also has relevant duties — particularly where the working environment is under their control.
What counts as lone working on a construction site?
Opening or locking up an unoccupied site, groundwork in a remote area of a large site, plant operators working away from the main crew, surveyors or engineers on single-person visits, and utility connection workers in trenches or confined spaces are all common lone working scenarios in construction.
Do I need an ARC for construction lone worker monitoring?
Not necessarily. The law requires proportionate controls, not a specific product tier. A manager-based escalation chain with timestamped digital records often satisfies the duty. ARC arrangements are worth considering for genuinely remote or high-risk isolated work.
What records should be kept?
Lone worker risk assessments, monitoring session logs (start time, end time, location), alert records with manager response times, training records, and the lone worker policy. These cover HSE, insurance, and principal contractor audit requirements.