Health and Safety Law and Risk
Why Construction Sites Are Hazardous
Construction is consistently ranked among the most dangerous industries in the UK. Workers, employers and members of the public can all be placed at risk on or near a building site, and understanding those risks is the first step towards controlling them. Every person on site — from the site manager to the newest apprentice — must understand the hazards they face and the rules that exist to protect them.
Risks on Construction Sites
Employees working on construction sites face four main categories of risk. First, heavy plant and construction vehicles — such as excavators, dumper trucks and mobile cranes — move around sites carrying heavy loads. A worker in a vehicle's blind spot faces a serious risk of being struck or crushed. Second, working at height is one of the leading causes of death in construction; falling from a scaffold, ladder or unguarded edge can result in fatal injuries. Third, manual handling — lifting, carrying, pushing or pulling heavy or awkward loads — causes a high proportion of musculoskeletal injuries in the industry. Fourth, slips, trips and falls on level ground — caused by wet surfaces, trailing cables or uneven ground — are among the most frequent causes of workplace injury on site.
Employers have a legal responsibility for the safe operation of construction sites. They are accountable for the systems, equipment and procedures in place, and can be prosecuted or fined in the event of accidents or incidents. Members of the public can also be put at risk when close to an active construction site — from falling objects, site traffic emerging onto public roads, and hazardous materials such as cement dust or asbestos. Sites must take steps to prevent unauthorised public access, such as using secure fencing and clear signs.
The four main risks to employees on construction sites are: heavy plant and construction vehicles, working at height, manual handling, and slips, trips and falls. Employers are legally responsible for site safety and can be prosecuted if accidents occur. The public must be protected from site traffic, falling objects and hazardous materials.
Following Correct Procedures
Simply knowing about hazards is not enough — everyone on site must follow the correct procedures. Procedures are the documented rules and steps that ensure contractors and employees work safely and prevent accidents. Examples include signing in and out of site, wearing the correct personal protective equipment in designated areas, following a specific method statement for a task, and attending site induction briefings. When procedures are ignored — for example, removing safety barriers around a floor opening to carry materials more easily — the risk of a serious accident increases significantly.
Risk Assessments
A risk assessment is a formal examination of the hazards associated with a task or workplace, and the control measures needed to reduce risk to an acceptable level. There are two types relevant to construction. A general risk assessment covers the overall health and safety hazards present on the site — such as access routes, site housekeeping, fire escape routes and general site traffic. A specific risk assessment is written for a particular hazardous activity, such as working at height on a scaffold, carrying out manual handling of heavy blocks, or working in a noisy environment. Both types must identify the hazard, assess who might be harmed and how, and set out appropriate control measures.
A control measure is any action, barrier or system that reduces the risk of harm. Effective control measures are chosen by following the hierarchy of control — a priority order that tries to eliminate or reduce the hazard at source before relying on personal protective equipment (PPE) as a last resort. At the top of the hierarchy: eliminate the hazard if possible (e.g. design out the need to work at height by pre-assembling components at ground level). Next: substitute the hazard with something safer (e.g. use a less hazardous chemical). Then: engineering controls such as guarding or extraction systems; administrative controls such as safe systems of work and limited working hours; and finally PPE. You need to understand that PPE is the last line of defence, not the first choice.
Health and Safety at Work Act
The Health and Safety at Work Act (1974) is the main workplace safety law in Great Britain. It places clear duties on employers to protect the health, safety and welfare of workers, visitors and members of the public. Health and safety regulations require employers in construction to prepare risk assessments, decide what control measures are necessary, and prevent or control exposure to hazards. They must also ensure that the hierarchy of control is followed when selecting those measures, monitor the level of exposure to hazards over time, prepare accident procedures so that incidents are dealt with promptly and correctly, and provide adequate training and supervision to all employees so they can carry out their work safely.
Under health and safety regulations, employers must: prepare risk assessments; decide on control measures; prevent or control exposure to hazards; follow the hierarchy of control; monitor exposure levels; have accident procedures in place; and train and supervise employees.
COSHH Regulations
The Control of Substances Hazardous to Health (COSHH) regulations sit alongside the Health and Safety at Work Act and deal specifically with hazardous substances. Construction sites contain many substances that can harm health — including cement dust (which can cause dermatitis and respiratory disease), silica dust from cutting stone or concrete (which causes a serious lung disease called silicosis), solvent fumes from adhesives and paints, and asbestos fibres in older buildings. Under COSHH, employers must identify hazardous substances on site, assess the risk they pose, and put in place control measures to prevent or reduce workers' exposure. This might mean using safer substitute products, providing local exhaust ventilation, or supplying appropriate PPE such as dust masks or gloves.
Respirable crystalline silica (RCS) is released when cutting, grinding or drilling materials that contain silica — including concrete, stone, brick and mortar. The particles are extremely fine and invisible to the naked eye, meaning a worker can inhale a dangerous amount without realising it. Over time, silica dust causes silicosis — permanent and irreversible scarring of the lungs that reduces breathing capacity and can be fatal. It is also linked to lung cancer. Because the damage occurs slowly, workers may not notice symptoms for years. COSHH assessments for any cutting or grinding task must identify RCS as a hazard, and control measures typically include wet cutting (using water to suppress dust), on-tool extraction, and where necessary a suitable dust mask rated for RCS (a P3 or FFP3 standard). The insidious nature of silica dust makes COSHH compliance critically important in construction.