Applicability of the CDM regulations
The CDM regulations apply to construction work to an extent that depends upon the extent and duration of the project, and on the nature of the project.
Generally, if the construction work is:
Notifiable to the Health and Safety Executive (i.e. likely to last more than thirty days); or
Involving five hundred or more person hours;
Then the project is identifiable as either construction (within the terms of the act) or demolition, and the CDM regulations are applicable.
The CDM regulations are not applicable when the construction is of a minor nature.