Working at Height: The Hierarchy of Control Every Employer Must Follow

Falls from height are consistently among the leading causes of fatal and serious workplace injury in the UK, and they cut across far more industries than construction alone — warehousing, maintenance, cleaning, retail (stock replenishment on high shelving), and facilities management all involve routine tasks that count as work at height. The Work at Height Regulations 2005 exist specifically to reduce that toll, and they work by imposing a structured decision-making process on employers rather than simply requiring generic care.

What counts as "work at height"?

Work at height is defined broadly — it isn't limited to working from a ladder or scaffold several storeys up. It covers any work where a person could fall a distance liable to cause injury, which includes work at or below ground level next to an opening or edge (such as an uncovered pit or excavation), as well as the more obvious cases of working on roofs, platforms, mobile elevated work platforms, and ladders. A task doesn't need to involve a dramatic height to fall within the regulations — a fall of even a metre or two, in the wrong circumstances, can cause a serious injury, and the regulations are written to capture that reality rather than applying only above some fixed height threshold.

Who the duty falls on

The regulations apply to employers and to anyone who controls the way work at height is carried out — this explicitly includes facilities managers and building owners who contract others to carry out work at height on their premises, not only the employer of the person actually doing the work. This matters in practice: a building owner who engages a contractor to clean high-level windows or carry out roof maintenance retains a duty under the regulations, even though the workers involved aren't their direct employees.

The hierarchy of control

Rather than leaving employers to choose whatever approach seems reasonable, the regulations set out a hierarchy that must be worked through in order, only moving to the next level where the previous one genuinely isn't reasonably practicable:

• Avoid work at height altogether where possible. The first and preferred option is to eliminate the need for anyone to work at height in the first place — for example, using extendable tools to clean windows from ground level rather than sending someone up a ladder.
• Prevent falls where work at height can't be avoided. Where the work genuinely has to happen at height, the next priority is preventing a fall from occurring at all — through the use of an existing safe place of work (a properly guarded flat roof, for instance) or appropriate equipment such as scaffolding, tower scaffolds, or mobile elevated work platforms with guard rails.
• Minimise the distance and consequences of a fall, if one does occur. Where the risk of a fall can't be entirely eliminated even with preventive measures, the final level of the hierarchy is to minimise how far someone could fall and how severe the consequences would be — through measures like nets, airbags, or other fall-arrest systems.

Ladders and stepladders sit at the bottom of this hierarchy — they are not banned, but HSE guidance is clear that they should only be used for low-risk, short-duration tasks where a more controlled method genuinely isn't reasonably practicable, not as a default first choice simply because they're quick to set up.

Core employer duties beyond the hierarchy

Alongside working through the hierarchy, employers and those in control of work at height must ensure the work is properly planned, appropriately supervised, and carried out by people who are competent to do it — or, for those in training, properly supervised by someone who is. This includes selecting the right type of equipment for the specific task rather than whatever happens to be available, checking that any equipment used is properly inspected and maintained, and taking particular care around fragile surfaces (such as certain roof materials), which are a recurring factor in serious falls precisely because the danger isn't always visually obvious to someone working on them.

A risk assessment specific to the task at hand is the starting point for all of this — the same general risk assessment habits that support manual handling compliance apply equally here, but work at height risk assessments need to explicitly work through the avoid-prevent-minimise hierarchy rather than jumping straight to "what equipment do we have."

Why the hierarchy matters more than a generic risk assessment

The value of the hierarchy is that it forces a genuine question about whether work at height is necessary at all, before any conversation about equipment or fall-arrest measures begins. It's common for organisations to default straight to "what's the safest way to do this at height" without first asking whether the task could be redesigned to avoid height altogether — and the regulations are structured specifically to close that gap, rather than leaving it as a matter of good practice that's easy to skip under time pressure.

Frequently asked questions

Does a short ladder job still count as "work at height"?

Yes — work at height is defined by the risk of a fall causing injury, not by a specific height threshold, so even relatively low-level tasks can be captured if there's a genuine risk of injury from a fall.

Can employers just use ladders for work at height tasks?

Ladders sit at the bottom of the hierarchy of control and should generally only be used for low-risk, short-duration tasks where avoiding the work or using safer equipment isn't reasonably practicable.

Who is responsible for work at height carried out by a contractor?

Anyone who controls how the work is carried out — including a facilities manager or building owner engaging a contractor — has duties under the regulations, alongside the contractor's own employer.

Falls from height remain preventable in the overwhelming majority of cases, and the hierarchy of control exists precisely to make sure the safest option gets considered first, rather than the most convenient one. Learnsignal's CPD courses cover UK workplace health and safety compliance across the full range of physical hazard categories.