As the client, you or your authorized third parties must give advance notice to the competent occupational health and safety authority at least two weeks before setting up the construction site if

• the expected duration of the work is more than 30 working days and more than 20 employees are scheduled to work on the construction site over a period of at least one shift at the same time, or
• the scope of the work is expected to exceed 500 person-days, whereby one person-day comprises the work performed by one person over one shift.

Setting up the construction site begins with the essential preparatory work at the site of the construction project that is required immediately before it is carried out, for example setting up social facilities, installing supply and disposal facilities, delivery of building materials, machinery and equipment.

You must also post the advance notice visibly and legibly on the construction site so that it is unaffected by external influences and the weather.

In the event of significant changes, you must update the posted advance notice. It is not necessary to resubmit it to the relevant health and safety authority.

Significant changes that require an adjustment to the advance notice are, for example

• Change of client or commissioned third parties,
• First-time appointment of a coordinating person or subsequent change of this person,
• shortening the duration of the construction work if this means that more work has to be carried out at the same time or in unplanned shifts,
• first-time involvement of employees from several employers or use of subcontractors,
• a significant increase in the maximum number of simultaneous employees or the number of employers or the number of companies without employees.