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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 (146KB, PDF)

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.

Graphic with hazard tape around step 3 of CDM regulations.

You may also be interested in...

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

The key publication Managing health and safety in construction - Construction (Design and Management) Regulations 2015 - (L153) on the legal requirements for CDM 2015.

  • Some very useful Frequently Asked Questions pages. These are not formal HSE guidance and are not intended to cover every aspect of the topic or be a ‘one size fits all’ answer, but provide consistent and helpful answers to some of the most common questions which have arisen about CDM 2015. 

Health and Safety Executive (HSE) information

The HSE is a good source of information and guidance. It has produced:


  • Some very useful Frequently Asked Questions pages. These are not formal HSE guidance and are not intended to cover every aspect of the topic or be a ‘one size fits all’ answer, but provide consistent and helpful answers to some of the most common questions which have arisen about CDM 2015. 
  • HSE Construction webpages and dedicated Resources page.