I am aware of the rules on F10 notification under CDM 2015, i.e. a project becomes notifiable where it lasts longer than 30 days AND has more than 20 workers, working simultaneously at any one point OR exceeds 500 person days. The designer (Architect) on behalf of the Client (Landlord) require urgent clarity on the division between Landlord's and Tenant's works to be executed by the same contractor at the same time on the same premises (Building). Do the Client (Landlord) & Client (Tenant) Notify separately or which one take the lead and do we treat the workers separate or add them together for calculating F10 Notification requirements. I would appreciate urgent guidance (I have asked the HSE but could take anything up to a month for a response) as we need to make a decision on whether the project becomes notifiable. Would ideally want to start works in a weeks time.

With thanks

JJJ

If two teams of a single contractor are working on a single building at the same time I think you would be very hard pressed to be able to claim that they were two different projects for reporting purposes. If they share so much as a toilet or site entrance between them then for H&S purposes I would declare them one project.

As to who reports, I don't think the HSE would be particularly bothered as long as one client does. I'm assuming that the tenant is non-domestic here by the way, otherwise reporting will revert back to the contractor or landlord.