Construction (Design and Management) Regulations 2015

These regulations relate to all construction projects throughout the UK, applying to all sizes of project domestic or commercial whether they are notifiable or not.

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 (

All projects where more than one contractor is involved must have as above plus:

  • An appointed principal designer and principal contractor
  • A Health and Safety File (read more)

When a construction, maintenance or refurbishment project exceeds 500 person days or lasts longer than 30 working days and has 20 workers working simultaneously at any point in the project, then the client must notify the HSE and submit an F10 form. (

Summary of CDM Duty Holder’s and their Specific ‘duties’ under CDM2015


Organisations or Individuals for whom a construction project is carried out;

Summary of role/main duties:

Make suitable arrangements for managing a project. This includes making sure that:

  • Other duty holders are appointed.
  • Sufficient time and resources are allocated.

Clients must also make sure that:

  • Relevant information is prepared and provided to other duty holders.
  • The principal designer and principal contractor carry out their duties.
  • Welfare facilities are provided.
Domestic Clients
People who have construction work carried out on their own home, or the home of a family member, that is not done in furtherance of a business, whether for profit or not.

Summary of role/main duties:

Domestic clients are in the scope of CDM 2015 but their duties as a ‘client’ are normally transferred to:

  • The contractor, on a single contractor job.
  • The principal contractor, on a project involving more than one contractor. However, a domestic client can choose to have a written agreement for the principal designer to carry out the client duties.

However, a domestic client can choose to have a written agreement for the principal designer to carry out the client duties.

Principal Designers

Designers appointed by the client (in writing) on projects involving more than one contractor. They can be an organisation with sufficient knowledge, experience and ability to carry out the role.

Summary of role/main duties:

Plan, manage, monitor and co-ordinate health and safety in the pre-construction phase of a project.

This includes:

  • Identifying, eliminating or controlling foreseeable risks.
  • Ensuring designers carry out their duties.
  • Prepare and provide relevant information to other duty holders
  • Provide relevant information to the principle contractor to help them plan, manage, monitor and co-ordinate health and safety in the construction phase.

Those who, as part of a business, prepare or modify designs for a building or a product, or prepare or modify designs to systems relating to construction work.

Summary of role/main duties:

When preparing or modifying designs, eliminate, reduce or control foreseeable risks that may arise during;

  • Contruction, and
  • When preparing or modifying designs, eliminate, reduce or control foreseeable risks that may arise during.

Provide information to other members of the project team to help them fulfill their duties.

Principle Contractors

Contractors appointed by the client to co-ordinate the construction phase of a project where it involves more than one contractor.

Summary of role/main duties:

Plan, manage, monitor and co-ordinate health and safety in the construction phase of a project. This includes:

  • Liaising with the client and principle designer
  • Preparing the construction phase plan
  • Organising co-operation between contractors and co-ordinating their work

Ensure that:

  • Suitable site induction plans are provided
  • Reasonable steps are taken to prevent unauthorised access
  • Workers are consulted and engaged in securing their health and safety
  • Welfare facilities are provided

Those who carry out the actual construction work. They can be either an individual or a company.

Summary of role/main duties:
  • Plan, manage and monitor construction work under their control so that it is carried out without risks to health and safety.
  • For projects involving more than one contractor, co-ordinate their activities with others in the project team – in particular, comply with directions given to them by the principal designer or principal contractor.
  • For single-contractor projects, prepare a construction phase plan.

The people who work for or under the control of contractors on a construction site.

Summary of role/main duties:

They must:

  • Be consulted about matters which affect their health, safety and welfare
  • Take care of their own health and safety and that of others who may be affected by their actions
  • Report anything they see which is likely to endanger either their own or others’ health and safety
  • Co-operate with their employer, fellow workers, contractors


The CDM 2015 Process- Does CDM 2015 Apply?

Pre-construction Information:

The CDM 2015 Process- Does CDM 2015 Apply?
  • Pre-construction information provides the health and safety information needed by:
    • i. Designers and contractors who are bidding for work on the project, or who have already been appointed, to enable them to carry out their duties
    • ii. Principal designers and principal contractors in planning, managing, monitoring and co-ordinating the work of the project.

    It also provides a basis for the preparation of the construction phase plan. Some material may also be relevant to the preparation of the health and safety file.

  • Pre-construction information is defined as information about the project that is already in the client’s possession or which is reasonably obtainable by or on behalf of the client. The information must:
    • i. Be relevant to the particular project
    • ii. Include an appropriate level of detail
    • iii. Be proportionate, given the nature of the health and safety risks involved
  • Pre-construction information should be gathered and added to as the design process progresses to reflect new information about the risks to health or safety and how they should be managed. Preliminary information gathered at the start of the project may not be sufficient where further design and investigation has been carried out.
  • When pre-construction information is complete it must include proportionate information about:
    • i. The project, such as the client brief and key dates of the construction phase
    • ii. The planning and management of the project, such as the resources and time being allocated to each stage of the project and the arrangements to ensure there is co-operation between duty holders and that the work is co-ordinated
    • iii. The health or safety hazards of the site, including design and construction hazards and how they will be addressed
    • iv. Any relevant information in an existing health and safety file.
  • The information should be in a convenient form and be clear, concise and easily understandable to allow other duty holders involved in the project to carry out their duties.
Information Flow

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