You will need a work permit if you fall under one of the red cases below:
Certain industries are subject to special requirements:
Service provider's country of origin
The country of origin is the country in which the company posting the worker has its registered office.
* General services up to 90 actual work days are subject to the notification procedure. Notification must be submitted eight days before beginning work. Permit L EU/EFTA (a short-stay permit) must be obtained for construction and construction-related services, landscaping services, surveillance and security services and industrial cleaning services provided on 90 actual work days per calendar year or less.