Working at Height UK: Safety Rules & Risk Guide

At a glance

• Legal basis: the Work at Height Regulations 2005 (SI 2005/735), sitting alongside the Health and Safety at Work etc Act 1974.
• No minimum height: work at height is defined by the risk of a fall liable to cause personal injury, not by distance — it includes work at or below ground level, such as next to an open excavation.
• Excluded: access or egress by a staircase in a permanent workplace is not work at height.
• The hierarchy of control (regulation 6): avoid the work at height where reasonably practicable; where that is not possible, prevent a fall using an existing safe place of work or collective measures; where a fall cannot be eliminated, minimise the distance and consequences.
• Who it applies to (regulation 3): employers (for their employees and anyone else under their control), and self-employed people, in Great Britain.
• Competence (regulation 5): nobody may plan, organise, supervise, or carry out work at height unless they are competent, or are being trained under the supervision of someone who is.
• Equipment selection (regulation 7): collective protection (guard rails, scaffolds, MEWPs) must be given priority over personal protection (harnesses).
• Inspection (regulation 12): a construction working platform from which someone could fall 2 metres or more must be inspected in position, and a mobile platform re-inspected on site within the previous 7 days.
• Harness examination: fall arrest equipment used as lifting equipment or a lifting accessory must be thoroughly examined by a competent person at least every 6 months under the Lifting Operations and Lifting Equipment Regulations 1998.
• More than one contractor: the Construction (Design and Management) Regulations 2015 add duties on the client to appoint a principal designer and principal contractor.

What counts as work at height under UK law

The statutory definition, set out in regulation 2 of the Work at Height Regulations 2005, is deliberately broad. "Work at height" means work in any place, including a place at or below ground level, and obtaining access to or egress from that place, where a person could fall a distance liable to cause personal injury if the precautions required by the Regulations were not taken.

That wording covers the obvious cases — scaffolds, cherry pickers, roof work — but it also covers loading bays, open manholes, fragile surfaces such as skylights, and low-level work where someone could fall into an excavation or through an opening in a floor. HSE's own guidance confirms you are working at height if you work above ground or floor level, could fall from an edge, through an opening or a fragile surface, or could fall from ground level into an opening or a hole.

There is one specific exclusion built into the definition: access or egress by a staircase in a permanent workplace is not work at height. Walking up and down an ordinary internal staircase does not trigger the Regulations, even though a fall on a staircase could obviously cause injury. A slip or a trip on the level is also outside the definition, because a fall from height has to involve a fall from one level to a lower one.

The legal framework: the Work at Height Regulations 2005

In England, Scotland and Wales the primary framework is the Work at Height Regulations 2005, made under the Health and Safety at Work etc Act 1974 and sitting alongside the Management of Health and Safety at Work Regulations 1999 (referenced directly in regulation 6, which requires every employer to take account of a risk assessment carried out under that legislation). The Regulations replaced the previous, more fragmented rules on ladders, scaffolding and roof work with a single, purpose-built regime aimed at preventing falls.

Who the duties apply to

Regulation 3 sets the scope. The duties fall on:

• Employers, in relation to work carried out by their own employees, and by anyone else under their control, to the extent of that control.
• Self-employed people, in relation to their own work and the work of anyone under their control — the Regulations treat a "relevant self-employed person" the same way as an employer for this purpose.
• Anyone else who controls the work of another person, in relation to that person's work, to the extent of the control they have.

This last category matters for facilities managers, building owners and site controllers who are not themselves employers of the people doing the work, but who direct or control how it is carried out. Duties can attach to more than one party on the same job.

The hierarchy of control: avoid, prevent, minimise

Regulation 6 is the centre of the Regulations, and it sets out a strict order in which risks must be tackled. An employer must first ensure that work is not carried out at height at all, where it is reasonably practicable to do the job safely another way. Assembling a component on the ground before lifting it into place, or using an extending tool from ground level, can remove the hazard entirely.

Where work at height cannot reasonably be avoided, the employer must take suitable and sufficient measures to prevent a fall, so far as is reasonably practicable. Regulation 6(4) requires this to be done, wherever practicable, by carrying out the work from an existing safe place of work, or by providing work equipment that prevents a fall — with collective measures such as guard rails and scaffolds taking priority over equipment that only protects one person.

Only where those measures do not eliminate the risk of a fall does the Regulations move to the third stage: minimising the distance and consequences of a fall that does occur, through equipment such as nets, airbags or a properly used fall arrest harness, alongside additional training and instruction.

The important point is that this is a hierarchy, not a menu. Each stage has to be considered and genuinely ruled out — on grounds of reasonable practicability — before moving to the next. A harness is not an alternative to guard rails; it is what you fall back on once collective protection has been properly assessed as not reasonably practicable for that specific task.

Selecting the right work equipment

Regulation 7 governs how equipment for work at height must be chosen. Employers must give collective protection measures priority over personal protection measures, and must take account of factors including the working conditions and risks at the specific location, the distance to be negotiated for access, the distance and consequences of a potential fall, how long and how often the equipment will be used, and the need for easy, timely rescue in an emergency. Equipment must also have dimensions appropriate to the work and the loads involved, and must otherwise be the most suitable option available, judged against the purposes of the hierarchy in regulation 6.

Planning, supervision and competence

Regulation 4 requires every employer to ensure that work at height is properly planned, appropriately supervised, and carried out in a manner that is, so far as reasonably practicable, safe — including planning for emergencies and rescue, not just the routine task. That planning must include the selection of work equipment in line with regulation 7.

Regulation 5 adds a separate, standalone duty on competence: no one may engage in any activity connected with work at height — including organising, planning or supervising it — unless they are competent to do so, or are being trained under the supervision of someone who is. Competence is not the same as holding a certificate. HSE guidance is clear that for low-risk, short-duration tasks involving ladders, competence can be no more than proper instruction on using the equipment safely; more technical work, such as planning a complex scaffold, will usually need recognised training and certification.

Weather and site conditions

Regulation 4(3) adds a specific duty that is easy to overlook: work at height must only be carried out when weather conditions do not jeopardise the health or safety of the people involved. High wind, ice, or heavy rain can turn an otherwise well-planned task into a serious risk. The only exception is for police, fire, ambulance or other emergency services acting in an emergency.

Ladders and stepladders: separating law from myth

HSE has published specific guidance to correct a persistent misunderstanding: ladders have not been banned. A ladder or stepladder remains a legitimate choice for a task where a risk assessment shows the low risk and short duration do not justify higher-protection equipment, or where existing site features cannot be altered. As a practical guide, HSE suggests considering alternative equipment if a task on a leaning ladder would keep someone up it for more than 30 minutes at a time — but short duration on its own does not decide the question; the risk assessment comes first.

Two other common myths are worth clearing up. You do not need a formal qualification to use a ladder — you need to be competent, which for straightforward tasks can simply mean proper on-the-job instruction. And the "two feet, one hand" rule is a simplification: what the law actually requires is three points of contact at the working position, which can be two feet and a steadied body (using knees or chest for stability) where both hands genuinely need to be free for a brief task, such as fixing a smoke detector. Ladders can also still be used to access a scaffold, provided they are the right type, in good condition, and effectively secured, extending at least a metre above the landing point for a secure handhold.

Guard rails, working platforms and equipment inspection

A "working platform" under the Regulations is not limited to a traditional boarded platform with handrails. It can be virtually any surface used as a place of work or a means of access, including a roof, a floor, a scaffold platform, a mobile elevating work platform, or the treads of a stepladder.

Where guard rails are used on construction work, HSE guidance confirms they must have a minimum height of 950mm, with any gap between the top rail and an intermediate rail no more than 470mm, and toe boards that are suitable and sufficient (a minimum height of around 100mm is generally accepted as adequate). For non-construction work there are no fixed dimensions in the Regulations themselves, but HSE operational guidance treats 950mm as the practical minimum, and buildings covered by the Building Regulations will typically need guard rails of 1100mm.

Regulation 12 sets out the inspection duties. Where the safety of equipment depends on how it has been installed or assembled, it must be inspected in that position before use. Equipment exposed to conditions that could cause dangerous deterioration must be inspected at suitable intervals, and again whenever exceptional circumstances that could affect its safety have occurred. A specific rule applies to construction working platforms from which a person could fall 2 metres or more: these must not be used in a given position unless they have been inspected there, or, for a mobile platform, inspected on site within the previous 7 days. Inspection results must be recorded and kept until the next inspection is logged, and a written report must generally be produced before the end of the working period and provided within 24 hours.

Fall arrest harnesses and personal protection equipment

Personal fall protection — a harness connected via an energy-absorbing lanyard to a suitable anchor point — sits at the bottom of the hierarchy of control and is used where collective protection has genuinely been ruled out as not reasonably practicable. Where a harness is used as lifting equipment for lifting a person, or as an accessory for lifting, it falls within the separate Lifting Operations and Lifting Equipment Regulations 1998. Regulation 9(3) of those Regulations requires such equipment to be thoroughly examined by a competent person at least every 6 months. A thorough examination carried out under LOLER is treated as satisfying the equivalent inspection duty in regulation 12 of the Work at Height Regulations, so employers do not need to run two parallel paper trails for the same piece of equipment. On top of the formal 6-monthly examination, the person using the harness should check it before each use, and any damaged equipment should be withdrawn from service immediately rather than patched up.

When more than one contractor is on site: CDM 2015

Construction projects that involve more than one contractor at any point — including subcontractors — bring in the Construction (Design and Management) Regulations 2015 alongside the Work at Height Regulations. The client must appoint a principal designer to coordinate health and safety during the design and pre-construction phase, and a principal contractor to plan, manage and coordinate health and safety during the construction phase itself, making sure the different contractors on site are working together safely rather than creating risks for each other.

What to do to stay compliant

1. Work out whether the work at height can be avoided. Ask first whether the task can be done from the ground, or with an extending tool, before planning how to do it safely up high.
2. Carry out and record a proper risk assessment. Cover the height, duration, surface conditions, weather exposure and the experience of the people doing the job, and revisit it if site conditions change.
3. Apply the hierarchy properly. Choose collective protection over personal protection wherever it is reasonably practicable, and be able to explain why, if you cannot.
4. Check competence, not just paperwork. Make sure people planning, supervising and carrying out the work genuinely understand the equipment, the site, and the emergency procedures for that job.
5. Keep equipment inspected and the records up to date. Track pre-use checks, the 7-day rule for mobile construction platforms, and the 6-monthly thorough examination for harnesses and other lifting accessories.
6. Plan for rescue, not just prevention. Emergency and rescue arrangements are a specific part of the planning duty under regulation 4, not an afterthought.
7. Identify who else has duties on your site. Where more than one contractor is involved, confirm who holds the CDM 2015 principal designer and principal contractor roles, and how coordination is happening.

This guide provides general information about the law on working at height in England, Scotland and Wales. It is not legal advice and is not a substitute for advice tailored to your specific circumstances. The law described was accurate as at August 2026 and is subject to change — always check GOV.UK, HSE and legislation.gov.uk for the most current position.

Last reviewed: August 2026 by a non-practising solicitor · Next review due: August 2027 or on legislative change.