Working at Height Regulations in UK Construction: What You Must Know

The Biggest Killer in UK Construction

Falls from height kill more construction workers in the UK than any other single cause. HSE statistics consistently show between 30 and 40 fatal injuries per year from falls, accounting for roughly half of all construction deaths. Hundreds more suffer life-changing injuries: broken backs, fractured skulls, spinal cord damage.

The frustrating part? The vast majority of these falls are preventable. They happen because someone skipped the planning, chose the wrong equipment, or ignored the inspection schedule. The law on working at height is clear, and it has been for over two decades. Yet enforcement actions, prohibition notices, and prosecutions for height-related failures remain among the HSE's most common interventions.

If you manage construction work, supervise trades, or work at height yourself, you need to understand these regulations inside out.

The Work at Height Regulations 2005

The Work at Height Regulations 2005 (WAHR 2005) apply to all work at height where there is a risk of a fall liable to cause personal injury. They place duties on employers, the self-employed, and anyone who controls the work of others.

The regulations replaced a patchwork of older rules and established a single, clear framework. They apply across all industries, but construction is where the stakes are highest.

The Hierarchy of Control

WAHR 2005 sets out a strict hierarchy that you must follow in order:

1. Avoid work at height: Can the work be done from ground level? Can components be assembled at ground level and lifted into place? Always consider this first 2. Prevent falls: Where work at height cannot be avoided, use work equipment or other measures to prevent falls. This means scaffolding, edge protection, MEWPs (mobile elevating work platforms), or other collective protection 3. Minimise the distance and consequences of a fall: Where the risk of a fall cannot be eliminated, use measures to minimise the distance fallen and the consequences. This means safety nets, airbags, or personal fall protection (harnesses with lanyards)

You cannot jump to step 3 without genuinely considering steps 1 and 2. The HSE will ask you to justify your decisions, and "it was quicker" or "we've always done it this way" won't pass.

What Counts as Work at Height

This trips people up more than you'd expect. Work at height means work in any place where a person could fall a distance liable to cause personal injury. There is no minimum height threshold.

That includes:

• Scaffolding (obviously)
• Ladders and stepladders
• Flat roofs, even those with low parapets
• Working on or near fragile surfaces (rooflights, fibre cement sheets, liner panels)
• Working above an opening or hole in a floor
• Working on a mobile elevating work platform (MEWP)
• Loading bays and edges of excavations
• Any raised platform without adequate edge protection

A two-metre fall from a stepladder onto a concrete floor can kill. The regulations don't distinguish between working at 2 metres and working at 20 metres. Both require proper planning and controls.

Choosing the Right Equipment

The choice of equipment must follow the hierarchy and be based on a risk assessment. This is how the main options compare:

Scaffolding

The default choice for prolonged work at height. Provides a stable, protected working platform with guardrails, toe boards, and adequate width.

• Must be erected, altered, and dismantled by competent persons
• Must comply with TG20 (NASC guidance) or be designed by a structural engineer
• Scaffold inspection requirements apply — inspections every 7 days and after any event likely to affect stability

Mobile Elevating Work Platforms (MEWPs)

Suitable for shorter-duration tasks or where scaffolding isn't practical. Includes cherry pickers, scissor lifts, and boom lifts.

• Operators must be trained and authorised (IPAF certification is the industry standard)
• Daily pre-use checks required
• Ground conditions must be assessed — soft ground, slopes, and overhead obstructions are common causes of MEWP incidents

Edge Protection

Temporary guardrails installed at leading edges, floor openings, and roof edges.

• Must include a top rail (minimum 950mm), mid rail, and toe board
• Must withstand the loads specified in BS EN 13374
• Suitable for work near edges where a full scaffold isn't needed

Safety Nets and Airbags

Fall arrest systems that catch workers who fall. These are a last resort in the hierarchy — they don't prevent the fall, they reduce the consequences.

• Safety nets must comply with BS EN 1263
• Maximum drop distance into the net must be calculated and controlled
• Regular inspection of nets for damage and correct tensioning

Personal Fall Protection (Harnesses)

Individual harness systems with lanyards or inertia reels. The absolute last option in the hierarchy.

• Only appropriate where collective protection (scaffolding, nets, edge protection) genuinely isn't reasonably practicable
• Users must be trained in correct fitting, attachment point selection, and rescue procedures
• A rescue plan is mandatory — suspension trauma can kill within minutes if a worker is left hanging in a harness

Competency Requirements

WAHR 2005 requires that anyone involved in organising, planning, supervising, or carrying out work at height must be competent to do so. That means having sufficient training, experience, and knowledge for the task.

In practice, this means:

• Scaffold erectors must hold recognised qualifications (CISRS cards)
• MEWP operators should hold IPAF certification
• Supervisors must understand the risks, the hierarchy of control, and the inspection requirements
• Workers must be trained in the safe use of whatever equipment they're using, even a stepladder

Competence records — training certificates, CSCS cards, equipment-specific qualifications — need to be current and verifiable. Keeping these organised across your workforce is a compliance task in itself. Tools like ComplianceVault let you store training records against individual workers, track expiry dates, and generate compliance packs that prove your team is qualified for the work.

Inspection Requirements

WAHR 2005 requires that work equipment used for working at height is inspected at defined intervals:

• Scaffolding: before first use, then at intervals not exceeding 7 days, and after any event likely to affect stability (high winds, heavy rain, structural modification, collision)
• MEWPs: daily pre-use checks by the operator, plus thorough examinations at intervals defined by LOLER 1998 (typically 6-monthly)
• Personal fall protection: pre-use visual checks before each use, detailed inspection at intervals recommended by the manufacturer (typically 6-12 months)
• Ladders: pre-use checks before each use, periodic formal inspections

Scaffold inspections must be recorded in writing. The report must be provided to the person on whose behalf the inspection was carried out within 24 hours. These records must be kept on site and available for inspection by the HSE.

Common Enforcement Actions

The HSE takes working at height failures seriously. Common enforcement outcomes include:

• Prohibition notices: issued on the spot, stopping work immediately. Common for unguarded edges, incomplete scaffolding in use, or workers at height without protection
• Improvement notices: requiring specific corrective action within a set timescale
• Prosecution: for serious or repeated failures. Fines regularly reach six figures, and custodial sentences are possible where failings lead to death or serious injury

HSE inspectors can and do make unannounced visits to construction sites. If they find people working at height without adequate protection, the consequences are immediate.

For a broader view of how working at height fits into your overall legal obligations, see our UK construction compliance guide.

Key Regulations and Guidance

• Work at Height Regulations 2005 (WAHR 2005)
• HSE guidance INDG401 — The Work at Height Regulations: A Brief Guide
• BS EN 13374 — Temporary edge protection systems
• BS EN 1263 — Safety nets
• TG20 — NASC guidance on tube and fitting scaffolding
• LOLER 1998 — Lifting Operations and Lifting Equipment Regulations (applies to MEWPs)
• CDM 2015 — overarching duties for managing construction health and safety

Summary

• Falls from height are the leading cause of death in UK construction — between 30 and 40 fatalities per year
• The Work at Height Regulations 2005 establish a strict hierarchy: avoid, prevent, then minimise. You must follow this order and be able to justify your choices
• "Work at height" includes anything where a fall could cause injury — there is no minimum height. Stepladders, flat roofs, and fragile surfaces all count
• Scaffolding must be inspected every 7 days and after any event affecting stability. All inspections must be recorded in writing
• Everyone involved in work at height must be competent — trained, qualified, and experienced for the specific task