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CDM Duty Holders Last modified: January 2, 2026

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CDM Duty Holders

SECTION GUIDE

What are CDM Duty Holders?

CDM duty holders are the key people and organisations with legal responsibilities under the UK’s Construction (Design and Management) Regulations 2015 (CDM 2015). They include clients, designers, principal designers, contractors, principal contractors, and workers – each with defined duties to ensure construction projects are safe and well-managed.

What does CDM Duty Holders mean in Health & Safety?

Under CDM 2015, all construction projects in the UK must assign duty holders. Their responsibilities are:

  • Clients – ensure suitable arrangements for managing projects, including appointing a principal designer and principal contractor.
  • Designers – eliminate, reduce, or control foreseeable risks through design.
  • Principal Designer – coordinate health and safety during the pre-construction phase.
  • Contractors – plan and manage their work safely.
  • Principal Contractor – coordinate health and safety during construction.
  • Workers – take care of their own and others’ safety, follow site rules, and report risks.

These roles are legally required, and failure to comply can result in enforcement action by the HSE.

  • Why do CDM Duty Holders matter for your business?

    If CDM responsibilities are ignored or poorly managed:

    • Employers risk serious accidents, and enforcement action.
    • Projects can face costly delays, fines, and reputational damage.
    • Workers’ health, safety, and wellbeing are directly compromised.

    Handled well, CDM compliance helps ensure safe, efficient, and legally sound construction projects – protecting both employees and the business.

  • CDM Duty Holders – best practices

    • Appoint a principal designer and principal contractor early on projects involving more than one contractor.
    • Carry out suitable risk assessments and maintain a construction phase plan.
    • Provide workers with training, induction, and supervision.
    • Maintain clear communication between all duty holders.
    • Keep thorough documentation to demonstrate compliance with CDM regulations.

    impact HR can support businesses by developing policies, training programmes, and compliance systems to meet CDM requirements.

Your Questions Answered

FAQs on the CDM Duty Holders

  • Who is responsible for contractors’ health and safety?Reveal

    Both the contracting organisation and the contractor share responsibility. Employers must ensure safe conditions, while contractors must work safely and follow agreed procedures.

  • How can businesses ensure compliance to CDM?Reveal

    By appointing competent duty holders, documenting risk management, and ensuring workers receive proper information, instruction, and training.

  • Do CDM Regulations apply to small projects?Reveal

    Yes – CDM 2015 applies to all construction projects, regardless of size or duration.

  • Who is responsible if CDM duties are not met?Reveal

    Each duty holder is accountable for their specific role. Organisations and individuals can be held accountable.

  • What’s the legal minimum standard for CDM duty holders in the UK?Reveal

    All construction projects must have identified duty holders. For projects with more than one contractor, a principal designer and principal contractor are legally required.

Where to find out more A collection of hand-picked useful resources relating to CDM Duty Holders from impact HR and beyond

Need support preparing with CDM and CDM Duty Holders?

Whether you’re updating HR or Health and Safety policies, training managers, or handling complex employee issues, impact HR can help you stay compliant, confident, and in control. Request a callback to see how we can support your business.

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