When CDM applies
CDM 2015 applies when: the project involves more than one contractor working simultaneously; or the project lasts more than 30 working days with more than 20 workers; or total person-days exceed 500.
Your duty as domestic client
As a domestic client, you can transfer your CDM duties to your Principal Contractor. This transfer happens automatically when you appoint a single contractor. Your principal contractor then takes on responsibility for: producing a Construction Phase Plan before work starts; ensuring health and safety is managed on site; producing a Health and Safety File at project completion.
Pre-Construction Information
Provide your contractor with any information you hold about the property — asbestos surveys, structural reports, drainage plans, previous works.
The Health and Safety File
At the end of the project, your principal contractor should hand you a Health and Safety File — containing as-built drawings, materials specifications, and maintenance instructions. Keep it. You will need it if you sell the property or do further works.