Use our free CDM 2015 notification calculator to check if your construction project needs to be notified.
Under CDM 2015, notification requirements apply to all construction projects. If your project reaches the notification threshold, regardless of whether the project is classed as domestic or commercial, it will require notification to the HSE.
Important: All CDM duties including the need to appoint the principal designer and principal contractor roles apply even if the project is not notifiable.
To find out if your project needs to be notified under CDM 2015, enter the project duration in days (each part day worked counts as a day) and the number of people you expect to have on site.
If the number of person days exceeds 500 then the project is notifiable under CDM 2015 (or where you have over 20 workers on your project at any one time and the project lasts over 30 days).
If your project will ever have more than 20 workers, at any one time, and the project exceeds 30 working days (including part days) - it is notifiable.
It is also important to check on the person days, because a project can still become notifiable under 30 days with less than 20 people. For example, a project lasting 29 days with 19 workers would still require notification because it exceeds the 500 person day rule.
The notification thresholds are where the project will:
Are you a CDM duty holder? Read our free CDM guides.