Working at Height Regulations

Quick Answer: The Work at Height Regulations 2005 (SI 2005/735) require employers and the self-employed to avoid working at height where reasonably practicable, prevent falls using collective protective measures where it cannot be avoided, and minimise the consequences if a fall occurs. "Work at height" means any place where a person could fall a distance liable to cause personal injury — there is no minimum height threshold, and the definition includes ground level work next to an excavation. Falls from height remain the single biggest cause of workplace fatalities in UK construction.

Summary

Falls from height kill more construction workers each year than any other cause of workplace fatality in the UK. The Work at Height Regulations 2005, which implemented EU Directive 2001/45/EC, replaced earlier fragmented legislation and established a clear three-step hierarchy that applies to all work where a fall could cause personal injury — regardless of height. A trip into a shallow excavation at ground level, a fall from cellar steps, and a fall from a six-storey scaffold are all within scope. There is no de minimis height below which the Regulations do not apply.

The Regulations were amended by the Work at Height (Amendment) Regulations 2007, which extended the scope to workers employed by the self-employed. In practice this means a sole trader who takes on any worker — even a labourer paid cash — has the full duty of the Regulations toward that worker.

For tradespeople, height work is a daily reality: ladders for access, mobile towers for internal work, scaffolding for sustained exterior work, MEWPs for awkward or high-reach tasks, and roof access for installation and repair. Understanding the equipment hierarchy, the training and inspection requirements, and the circumstances in which personal fall arrest can and cannot substitute for collective edge protection is what separates compliant practice from the kind of incident that ends in prosecution, a civil claim, or a funeral.

Key Facts

• Legal framework — Work at Height Regulations 2005 (SI 2005/735), amended by SI 2007/114
• Definition of "work at height" — any place where a person could fall a distance liable to cause personal injury; includes excavations at ground level, cellar steps, and fragile roofs at low pitch
• No minimum height threshold — the Regulations apply wherever a fall could injure; a 300 mm drop into a sharp-edged trench is within scope
• Three-step hierarchy — (1) avoid working at height where reasonably practicable; (2) prevent falls using collective protective measures; (3) minimise fall consequences where prevention is not fully achievable
• Collective before personal — edge protection (guardrails, toe boards) must take precedence over personal fall arrest (harnesses, lanyards)
• Ladders are not the default — ladders are suitable only for light, short-duration work where a risk assessment shows they are the most practical option; they are not appropriate for tasks requiring two free hands
• EN 131 ladder classes — Class I (professional, rated to 175 kg) is the minimum standard for any trade use; Class III (domestic) must not be used on site
• Tower scaffold height ratio — maximum 3:1 height to minimum base dimension outdoors; 3.5:1 indoors
• PASMA qualification — required to erect, alter, or dismantle mobile tower scaffolding
• CISRS card — required for scaffolders erecting tube-and-fitting or system scaffold
• Scaffold inspection — every 7 days by a competent person, and after any event liable to affect integrity; recorded on an SS17 or equivalent form
• Edge protection minimum dimensions — top guardrail at least 950 mm, no gap exceeding 470 mm between rails, toe board at least 150 mm high
• IPAF PAL card — required to operate mobile elevated work platforms (MEWPs)
• Fragile surfaces — roof lights, old asbestos cement sheets, corroded metal decking; assume fragile until proven otherwise; crawling boards required before placing weight
• Rescue plan — any use of fall arrest equipment requires a written rescue plan before work begins

Quick Reference Table

Detailed Guidance

The Three-Step Hierarchy in Practice

Step 1 — Avoid working at height. This is the starting point, not an afterthought. Can a section of cladding be pre-assembled at ground level and craned into position? Can a downpipe fitting be made to a ground-level subassembly? Can work be carried out from inside a building through an opening, avoiding external height access entirely? If a realistic alternative exists, it must be used and documented.

Step 2 — Prevent falls using collective protection. Where working at height is unavoidable, collective measures must come first. Collective protection protects everyone in the work area without requiring individual action:

• Guardrails and toe boards around all open edges of working platforms
• Safety nets or soft-landing systems below the work area
• Barriers preventing access to unguarded edges during construction phases

Collective measures are preferred over personal fall arrest because they protect all workers regardless of compliance. A guardrail works even if a worker is not wearing a harness; a harness only works if the worker is wearing it, has it correctly fitted, and it is clipped to an adequate anchor.

Step 3 — Minimise consequences. Only where falls cannot be prevented by collective measures should personal fall protection be used:

• Fall arrest harnesses with energy-absorbing lanyards (free-fall arrest)
• Inertia reels (self-retracting lanyards, which limit fall distance)
• Work positioning systems (restraint systems that prevent reaching the fall edge)

The critical requirement alongside any fall arrest system is a written rescue plan, prepared and tested before work begins. Suspension trauma (harness hang syndrome) can cause loss of consciousness within minutes of a worker being suspended in a harness in an upright position. A rescue plan must include provisions for rapid lowering or retrieval and horizontal recovery; sitting an arrested worker upright can itself be dangerous.

Ladders and Stepladders

Ladders are frequently misused as general-purpose working platforms. The Regulations do not ban ladders, but they restrict their use to situations where a risk assessment demonstrates they are the most practical option for the work involved.

A ladder is not suitable when:

• Both hands are required to perform the work
• The task takes longer than approximately 30 minutes at one position
• The work requires significant sideways reach beyond the stiles
• Loads heavier than approximately 10 kg need to be carried up while climbing

The 1-in-4 rule: the foot of the ladder is positioned 1 metre out from the base of the structure for every 4 metres of height — approximately 75° from horizontal. At pitches shallower than this the ladder slides; steeper and it topples backward.

At the top: the ladder must extend at least 1 metre (approximately 5 rungs) above the landing point to provide a handhold when stepping on and off.

Securing: at the foot, a second person footing the ladder or a proprietary stabiliser. At the top, tied to the structure using the stile, not the rungs. Both footing and tying are preferred for any significant height.

EN 131 class ratings: Class I (professional grade, 175 kg rated load) is the minimum standard for any trade use. Class II (semi-professional, 150 kg) may be acceptable for light occasional use. Class III is domestic grade and must not be used on any trade or construction site.

Stepladders must be fully open before use. The EN 131-2 standard governs stepladder design. Trade-grade stepladders should carry a declared rated load of 150 kg minimum. Stepladders must not be used where both hands are required to hold the work — the hand rail and stile provide the third point of contact.

Tower Scaffold

Mobile tower scaffolding must be erected, altered, and dismantled by a person with PASMA (Prefabricated Access Suppliers' and Manufacturers' Association) training or equivalent. Key rules:

Height-to-base ratios:

• Outdoors: maximum 3:1 — a 1.2 m minimum base dimension gives a maximum platform height of 3.6 m
• Indoors: maximum 3.5:1 — same base gives 4.2 m maximum

Stabilisers/outriggers must be fitted where specified by the manufacturer's instructions for the height being used. Not fitting outriggers to achieve extra height without them is a common compliance failure.

Access: via the inside end frame only. Climbing the outside of the tower is prohibited and significantly increases tip-over risk.

Moving the tower: only when unoccupied. Push from the base. Check overhead obstructions and floor load capacity. Lock castors immediately after positioning.

Surface: level, firm, and capable of bearing the load. Mobile towers on wet grass, soft ground, or uneven pavement are not compliant regardless of the height involved.

Board overlap: platforms must be fully boarded with boards overlapping at least two rungs of the frame to prevent displacement.

Scaffolding

Scaffolding erection, alteration, and dismantling in the UK requires workers trained to CISRS (Construction Industry Scaffolding Record Scheme) standards:

• Trainee Scaffolder — basic level, supervised erection of standard configurations
• Scaffolder — can erect standard scaffolding independently
• Advanced Scaffolder — complex and bespoke structures
• Scaffold Inspector — competent to carry out formal inspections

Inspection requirements under the Regulations:

1. Before first use after erection or after alteration
2. After any event likely to have affected integrity (storm, vehicle impact, adjacent excavation, heavy snow loading)
3. At intervals not exceeding 7 days during use

Each inspection must be recorded, typically on an SS17 form or equivalent. The record must note the location, date, inspector's name and qualifications, and any defects. Defects must be rectified before the scaffold is used.

TG20:21 (NASC Technical Guidance Note) provides design tables for tube-and-fitting scaffolding under standard loading. Scaffolding outside TG20 parameters — unusual loads, bespoke geometry, very high structures — requires a bespoke design by a structural engineer with a signed and dated calculation.

MEWPs (Mobile Elevated Work Platforms)

MEWPs include scissor lifts, articulated and telescopic boom lifts, and vertical mast platforms. IPAF (International Powered Access Federation) PAL card training is the UK industry standard for operators. Categories relevant to construction:

• 3a — mobile vertical personnel lifts (scissor lifts, vertical mast platforms)
• 3b — mobile boom-type lifts (articulated and telescopic boom platforms)

Pre-use checks before each shift: hydraulic fluid level, tyre pressures or wheel conditions, outrigger condition and deployment, emergency descent controls, and harness anchor point integrity within the basket.

Ground conditions must be assessed before positioning. Outriggers require firm, level ground. Ground bearing pressure calculations may be needed on soft or made-up ground. MEWPs must not operate in wind speeds above the manufacturer's stated limit — typically Beaufort Scale 6 (around 12.5 m/s).

Occupants of all MEWPs must wear a harness connected to the designated anchor point inside the basket. For most MEWPs this is a work positioning (restraint) function — the harness prevents the worker from falling out, not from falling from a height.

Edge Protection

All open edges of working platforms, roofs, and elevated floors from which a person could fall must be protected with guardrails meeting the minimum dimensions:

• Top guardrail: at least 950 mm above the working surface
• Intermediate rail: positioned so the gap between the top rail and toe board does not exceed 470 mm at any point; a single intermediate rail is often adequate
• Toe board: at least 150 mm high, preventing tools and materials rolling off the edge

For pitched roofs, eaves barrier systems (proprietary scaffold bracket guardrails at the eaves level) are the standard collective protection at the lower edge. Ridge guardrails or working platforms provide protection on the upper slope.

Fragile Surfaces

Roof lights, asbestos cement sheets, old fibre cement roof panels, and corroded or thin metal decking are fragile surfaces. The default assumption must be that any unverified roofing material is fragile until inspected and confirmed otherwise by a competent person.

Workers must not step on or place weight on fragile surfaces. Required controls:

• Prominent warning signs at roof access points where fragile surfaces are present
• Physical barriers or covers preventing inadvertent access to fragile areas
• Crawling boards or staging placed across the fragile material to distribute weight over the structural members beneath; boards must span at least two roof members and be rated for the load
• Safety nets beneath the work area where crawling boards alone are insufficient protection

Asbestos cement roofing — common on agricultural and older industrial buildings — presents both a fragility risk and an asbestos exposure risk. Any suspected asbestos-containing material must be assessed before roof work begins.

Fall Arrest versus Fall Restraint

These are two fundamentally different systems and are frequently confused.

Fall restraint — a system that prevents the worker from reaching the fall edge. The lanyard length is set so the worker cannot physically get to the unguarded edge. No fall occurs; the system is under tension only when the worker reaches the limit of movement. Requires a firm anchor and a correctly measured restraint lanyard.

Fall arrest — a system that allows a fall to begin but arrests it before the worker strikes a surface. An energy-absorbing lanyard or inertia reel limits the fall distance. The maximum arrested fall distance (including lanyard extension and harness stretch) should not exceed 0.5 m with a shock absorber, or around 2 m with an inertia reel of 1.75 m arrest distance. Requires sufficient clearance below the worker to arrest the fall before impact.

A rescue plan is mandatory for fall arrest work. A worker hanging in a fall arrest harness is in immediate danger of suspension trauma and must be recovered within minutes.

Frequently Asked Questions

Is a harness required every time I work at height?

No. A harness is required only when collective protection — guardrails, working platforms with edge protection — cannot be provided and the fall risk cannot be eliminated. On a properly guarded scaffold with full edge protection, no harness is required on the platform. Harnesses are most commonly required for roofers working on pitched roofs where conventional edge protection is impractical, steel erectors ahead of deck construction, and tree surgeons — not as a routine substitute for properly designed collective protection.

My ladder has a crack in one stile. Can I still use it?

No. Any visual defect — cracks in stiles or rungs, bent or corroded rungs, missing or damaged feet, loose or absent locking mechanisms — means the ladder must be removed from service immediately. Tag it as defective and either repair it through a competent repairer or destroy it. A cracked aluminium stile can fail without warning under load; the crack propagates rapidly in aluminium alloy under cyclic loading.

Who counts as a "competent person" for scaffold inspection?

A competent person for scaffold inspection has the necessary training, knowledge, and experience to identify defects and assess their significance. In practice this means a CISRS-trained scaffolder (Advanced or Supervisor level). A site manager who has attended a scaffold inspection awareness course is not equivalent to a CISRS Advanced Scaffolder and is not competent to sign off a complex scaffold. If in doubt, use the scaffolding contractor that erected the structure.

Do the Regulations apply to domestic DIY?

The Work at Height Regulations 2005 apply in the context of employment and self-employment. They do not apply to private individuals carrying out DIY on their own property. However, a self-employed tradesperson working at a domestic customer's property is subject to the full Regulations. A homeowner who employs a tradesperson to work at height at their property has duties as a client under CDM 2015 to satisfy themselves that the contractor manages the risks.

What is suspension trauma, and why must a rescue plan be in place before using a harness?

Suspension trauma (orthostatic shock or harness hang syndrome) occurs when a person suspended upright in a harness for more than a few minutes experiences blood pooling in the lower limbs. Reduced venous return to the heart can cause loss of consciousness and, if the person is left suspended, cardiac events. Recovery requires the person to be lowered to a horizontal or semi-horizontal position, not removed from the harness and sat upright. Any rescue plan must include provision for rapid recovery, horizontal positioning, and immediate first aid. A rescue plan on paper that has not been tested or briefed to the site team is not adequate.

Regulations & Standards

• Work at Height Regulations 2005 (SI 2005/735) — primary legislation; three-step hierarchy, equipment requirements, inspection duties; amended by SI 2007/114

• Construction (Design and Management) Regulations 2015 (SI 2015/51) — client, designer, and principal contractor duties; fall prevention must be considered from the design stage

• Lifting Operations and Lifting Equipment Regulations 1998 (LOLER) — applies to MEWPs; thorough examination every 6 months

• Provision and Use of Work Equipment Regulations 1998 (PUWER) — applies to all work equipment including ladders and towers; inspection and suitability requirements

• EN 131-1/2 — ladders; EN 131-7 — podium steps

• EN 1004-1 — mobile access towers; PASMA standards reference this

• EN 12811-1 — performance requirements and design for access and working scaffolds

• EN 361 — full-body harnesses for fall arrest

• EN 795 — anchor devices for personal fall protection systems

• EN 354 and EN 355 — lanyards and energy absorbers

• EN 1263-1 — safety nets

• TG20:21 — NASC technical guidance for tube-and-fitting scaffolding; industry reference for standard scaffold design in the UK

• HSE INDG401 — Safe use of ladders and stepladders; free guidance leaflet

• HSE — Work at Height Regulations guidance

• HSE — Falls from height statistics

• HSE — INDG401 Safe use of ladders

• PASMA — Tower scaffold training and guidance

• IPAF — MEWP operator training

• NASC — TG20:21 scaffolding guidance

• scaffold inspection records and SS17 forms — 7-day inspection checklist, what to record, and what defects require immediate action

• PPE selection guide — fall arrest harness and lanyard selection, anchor point requirements, and pre-use inspection

• manual handling regulations — carrying materials on scaffolding and ladders creates a combined height and manual handling risk requiring separate assessment

• flat roofing — edge protection requirements specific to flat roof work and low-pitch fragile surfaces