Introduction
Construction projects bring a range of health and safety risks that must be effectively managed from the earliest planning stages through to project completion. The Construction (Design and Management) Regulations 2015 (CDM) apply to virtually all construction work and place legal duties on clients, designers, principal designers, contractors and principal contractors to ensure work is planned, managed and carried out safely. Effective compliance not only protects workers and others who may be affected by construction activities but also helps avoid costly delays, enforcement action and reputational damage.
Legal Requirements Under CDM
CDM requires duty holders to work together to identify, eliminate and control foreseeable risks throughout a project's lifecycle. Clients must make suitable arrangements for managing projects, appoint competent duty holders where required, provide relevant information and ensure sufficient time and resources are allocated. Designers must eliminate hazards where possible and reduce risks through design decisions. Contractors must plan, manage and monitor their work to ensure it is carried out safely. All parties must cooperate, communicate effectively and coordinate their activities throughout the project.
Principal Contractor Responsibilities
A Principal Contractor (PC) must be appointed by the client on projects involving more than one contractor. The Principal Contractor is responsible for planning, managing, monitoring and coordinating health and safety during the construction phase. Key duties include:
Preparing, implementing and reviewing the Construction Phase Plan.
Coordinating contractors and ensuring effective cooperation.
Providing suitable site inductions and supervision.
Ensuring welfare facilities are available and maintained.
Controlling site access and preventing unauthorised entry.
Ensuring competent contractors and workers are engaged.
Monitoring site standards and compliance throughout the project.
The Principal Contractor plays a critical role in ensuring risks are effectively managed and controlled during construction activities.
Principal Designer Responsibilities
A Principal Designer (PD) must be appointed where a project involves more than one contractor. The Principal Designer is responsible for planning, managing, monitoring and coordinating health and safety during the pre-construction phase. Their duties include:
Identifying and eliminating foreseeable hazards during design.
Coordinating the work of designers.
Ensuring risks remaining within designs are communicated.
Assisting the client with pre-construction information.
Liaising with the Principal Contractor throughout the project.
Contributing information for the Health and Safety File.
By influencing decisions at the design stage, Principal Designers help prevent risks before construction work begins
Engineering Stone: Increased Regulatory Focus
Many construction, refurbishment and fit-out projects involve engineered stone products, particularly for worktops, wall surfaces and decorative finishes. Recent regulatory attention has highlighted the significant health risks associated with engineered stone due to its high crystalline silica content, which can reach up to 95%. When cut, drilled, ground or polished, engineered stone can release respirable crystalline silica (RCS) dust capable of causing severe and irreversible respiratory diseases, including silicosis, chronic obstructive pulmonary disease (COPD) and lung cancer.
Recent guidance has made clear that dry cutting of engineered stone is considered unacceptable. Businesses undertaking fabrication, installation, maintenance or refurbishment activities involving engineered stone must ensure suitable controls are implemented and maintained. Regulatory scrutiny has increased significantly, with inspection programmes focusing on how organisations manage silica dust exposure.
The Importance of Safety Inspections
Businesses should proactively inspect work activities involving engineered stone to verify that control measures remain effective. Inspections should include:
Review of risk assessments and COSHH assessments.
Verification that wet-cutting methods are used where required.
Checks on local exhaust ventilation (LEV) systems.
Inspection of respiratory protective equipment (RPE).
Monitoring housekeeping standards and dust management.
Verification of worker training and competency records.
Review of health surveillance arrangements.
Regular inspections help identify deficiencies before they result in ill health, incidents, or regulatory enforcement action.
Key Control Measures
Elimination and Substitution
The most effective way to control exposure to respirable crystalline silica (RCS) is to eliminate or reduce the hazard wherever reasonably practicable. Businesses should consider specifying and selecting engineered stone products with a lower silica content and avoid unnecessary cutting, grinding, or modification activities. Early planning during the design and procurement stages can help reduce the need for high-exposure processes and minimise the generation of hazardous silica dust.
Engineering Controls
Where work with engineered stone cannot be avoided, engineering controls should be implemented to control dust at its source. Water suppression systems should be used during cutting and fabrication activities to significantly reduce airborne silica dust, while suitable local exhaust ventilation (LEV) systems should be installed and maintained where appropriate. Effective arrangements should also be in place to manage slurry, mist and residual contamination to prevent dust becoming airborne again.
Administrative Controls
Administrative controls support engineering measures by establishing safe systems of work and ensuring that workers understand how to carry out tasks safely. Employers should provide task-specific training, supervision and instruction for all personnel involved in processing engineered stone. Access to high-exposure work areas should be restricted to authorised personnel, and regular inspections, monitoring and maintenance programmes should be implemented to verify that control measures remain effective and continue to protect workers.
Personal Protective Equipment (PPE)
Where residual exposure remains after higher-level controls have been applied, suitable respiratory protective equipment (RPE) should be provided and worn. The selected RPE should be appropriate for the level of exposure and correctly fitted to each user. Businesses should ensure face-fit testing is completed where required and that equipment is routinely inspected, maintained and replaced as necessary. Workers should also receive training on the correct use, limitations and storage of their respiratory protection.
Health Surveillance
Health surveillance forms an important part of managing workers' long-term health where exposure to respirable crystalline silica cannot be fully eliminated. Organisations should implement appropriate health surveillance programmes for employees who are regularly exposed to silica dust, enabling the early identification of adverse health effects and ensuring that any concerns are investigated promptly. Routine health monitoring, combined with regular reviews of exposure controls, helps demonstrate compliance and supports the ongoing protection of workers from serious occupational lung diseases.
Key Concerns and Safety Measures
Organisations involved in construction, refurbishment or facilities management should be particularly aware of the following concerns:
Contractors carrying out uncontrolled cutting activities.
Inadequate dust suppression methods.
Poor housekeeping resulting in secondary dust exposure.
Lack of suitable respiratory protection.
Failure to monitor worker exposure.
Inadequate contractor management and supervision.
Outdated risk and COSHH assessments.
To address these risks, businesses should ensure contractor arrangements are regularly reviewed, construction activities are monitored, inspections are documented, and corrective actions are promptly implemented. Duty holders under CDM should also ensure that silica-related risks are considered during project planning and communicated throughout the project lifecycle.
Summary
CDM Regulations place clear responsibilities on clients, Principal Designers, Principal Contractors and contractors to manage health and safety throughout construction projects. Effective planning, coordination and communication are essential to achieving compliance and protecting those affected by construction work. At the same time, recent attention on engineered stone highlights the need for organisations to review their arrangements for managing silica dust exposure. Regular inspections, robust control measures, competent supervision and proactive health monitoring can help businesses meet their legal obligations while protecting workers from serious and preventable health conditions.
