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CDM 2015 Changes to Duty Holders

Guide to Construction, Design and  Management CDM 2015 Duty holders Updates to their Roles & Responsibilities

In light of the draft Construction (Design & Management) Regulations (CDM) 2015 having been published to replace CDM 2007, due to be enforced 6 April 2015, here is an outline of the updates for all parties and their duties, involved in a construction project.


Make suitable arrangements for managing the project so that health, safety and welfare is secured; take ownership of and communicate those arrangements clearly to other duty holders.

Appoint a principal designer and principal contractor for all projects with more than one contractor on site (relevant duties continue to default to the client if appointments are not made).

Ensure the principal designer and the principal contractor comply with their duties.

Notify projects scheduled to last longer than 30 working days and have more than 20 workers working simultaneously at any point in the project, or exceed 500 person days.


Take into account the general principles of prevention when preparing or modifying a design.

Principal designers

CDM Coordinator role replaced by a principal designer, with the task of ensuring the pre-construction phase is properly planned, managed and monitored, and health and safety matters are effectively coordinated.

Single contractor

Ensure a suitable construction phase plan is produced for all projects.

Apply the general principles of prevention when planning their work.

Contractor/Principal contractor

Carry out the ‘domestic client duties’ as applicable (may be done by the principal designer following written agreement).

Principal designer and principal contractor

The principal designer must pass the health and safety file to the principal contractor for completion where the appointment of the principal designer concludes before the end of the project.

All duty holders

A structural simplification of the Regulations - focus on small to medium projects       involving SMEs.

The current ACoP is to be substituted with L series guidance, supplemented by industry guidance.

Competence requirements are separated into skills, knowledge, training and experience (and organisational capability if an organisation).

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A detailed guide to CDM 2015 & 5 duty holders
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