The Construction (Design and Management) Regulations 2015 (CDM 2015) came into force 6th April 2015. The main changes are summarised as follows: A new Principal Designer (PD) role replaces the existing CDM Coordinator role The removal of the Domestic Client Exemption The requirement to notify HSE about projects expected to last more than 30 days, or involve more than 500 person days of labour, will be replaced by a requirement to notify HSE of projects involving "more than 30