The Construction (Design and Management) Regulations 2015 came into effect in April 2015 and introduced several significant changes from the 2007 regulations. Key changes include: - Replacing the CDM Coordinator role with a new 'Principal Designer' role to have more influence over design. - Requiring written construction phase plans for all projects, not just notifiable ones. - Applying the regulations to domestic clients who can delegate duties to contractors. - Introducing transitional provisions for projects that began before April 2015. - Awaiting new, shorter guidance from the HSE to replace the abolished Approved Code of Practice.