CDM/General/TBT-CDM-006

Contractor Duties Under CDM

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Contractor Duties Under CDM

Toolbox Talk Record

Ref: TBT-CDM-006  |  Issue: 1  |  Date: March 2026
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What?

  • CDM 2015 places specific duties on every contractor working on a construction project, regardless of project size.
  • A contractor is any business or person who carries out, manages, or controls construction work — this includes subcontractors.
  • Contractors must plan, manage, and monitor their own work to ensure it is carried out without risk to health and safety.
  • They must provide adequate supervision, instruction, and information to their workers for every task on the project.
  • Contractors must ensure their workers have the skills, knowledge, training, and experience to carry out the work safely.
  • They must cooperate with the principal contractor and other contractors to coordinate work and prevent conflicts between trades.
  • Contractors must comply with the site rules and directions given by the principal contractor for the project.
  • They must report anything they are aware of that is likely to endanger the health or safety of any person on site.
  • Contractors must provide their workers with the information and training needed to carry out their work safely.
  • Welfare facilities must be provided or arranged for their workers unless the principal contractor is providing them.

Why?

Personal legal dutyEvery contractor has individual legal duties under CDM — claiming ignorance of the law is not a defence against prosecution.
Competent workforceContractors must ensure their workers are trained and competent — sending unqualified workers to site is a criminal offence.
CooperationCDM requires contractors to work together — failure to cooperate creates the dangerous trade interface incidents that kill workers.
Do Don't
  • Plan, manage, and monitor your work to ensure it is carried out safely.
  • Provide adequate supervision and instruction for all your workers on site.
  • Ensure every worker you employ has the skills and training for their specific task.
  • Cooperate with the principal contractor and other contractors on the project.
  • Comply with site rules and directions from the principal contractor.
  • Report any hazards or unsafe conditions you discover to the principal contractor.
  • Provide information and training to your workers for safe task completion.
  • Ensure welfare facilities are available for your workers on the project.
  • Maintain your own health and safety records for the work you carry out.
  • Contribute relevant safety information to the Health and Safety File.
  • DON'T carry out construction work without planning how it will be done safely.
  • DON'T leave your workers unsupervised when they need guidance on the task.
  • DON'T send workers to site who lack the training and competence for the work.
  • DON'T refuse to cooperate with other contractors — CDM requires coordination.
  • DON'T ignore site rules set by the principal contractor — they apply to you.
  • DON'T keep quiet about hazards you find — report them to the principal contractor.
  • DON'T assume your workers know how to do the job safely — provide the information.
  • DON'T leave your workers without access to welfare facilities on the project.
  • DON'T fail to keep health and safety records for your construction activities.
  • DON'T withhold information that should be included in the Health and Safety File.

See also: CDM 2015 Awareness | Worker Duties Under CDM

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