Building emergency procedures (conceptsafety.com.au)

You must implement the plan in an emergency and follow emergency services' instructions.
You must provide training and ensure workers understand the emergency plan and procedure.
You must consult with your workers and their health and safety representatives, if there are any, when making and reviewing emergency plans.

If you need help please contact your state or territory work health and safety authority.
Under the model WHS laws, all workplaces must have an emergency plan in place.
This includes ,workplaces where construction work is being undertaken.
The plan must let workers and visitors know what to do in an emergency.

Australian Standard AS 3745-2010, Planning for emergencies in facilities (including:

This includes ,workplaces where construction work is being undertaken.
The plan must let workers and visitors know what to do in an emergency.
The emergency plan should be easy to access and reviewed and updated regularly.
How to alert people at the workplace to an emergency or potential emergency - for example, using a siren or bell alarm .