The Construction (Design and Management) Regulations 2015 apply to every construction project in the UK, including domestic house extensions and loft conversions. This page explains in plain English what CDM 2015 requires of you as the homeowner (Client), what we take on as Principal Contractor and Principal Designer, when a project becomes notifiable to the HSE and how we protect your family, neighbours and site workers throughout the build with a written Construction Phase Plan, risk assessments, method statements and daily site checks.