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About CDM

Find out about the Construction (Design and Management) Regulations (CDM), and where you can get further resources and support.

CDM are the main set of regulations for managing the health, safety and welfare of construction projects. Watch our short video which explains the basics of CDM.

Key points to CDM Regulations 2015 

The project must follow all of Steps 1 and 2 PLUS the client must notify HSE of the project.

 Download an A4 poster (660KB PDF) here which illustrates these key points.

All projects must have:

  • workers with the right skills, knowledge, training and experience,
  • contractors providing appropriate supervision, instruction and information,
  • a written construction phase plan. Download this example

Graphic of warning triangle depicting step 1 of CDM regulations.

Projects involving more than one contractor (domestic or non-domestic):

  • must follow Step 1 plus:  
  • a principal designer and principal contractor must be appointed,
  • a health and safety file.

Graphic of warning triangle depicting step 2 of CDM regulations.

If work is scheduled to:

  • last longer than 30 working days and,
  • have more than 20 workers working simultaneously at any point in the project,
  • OR exceeds 500 person days

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The Health and Safety Executive (HSE) is a good source of information and guidance. It has produced: