"Czech Point of Sigle Contact is a public service providing information to foreign service prviders from other EU an EEA countries on the relevant rules and registrations in the Czech Republic"

Establishment of a permanent business
If an entrepreneur establishes itself in another Member State, then it has a permanent office or place of business there. For example, if a German engineering firm opens a branch office in the Czech Republic, from which it hires local workers and provides services, it is considered as being established in the Czech Republic.

Cross-border (temporary) provision of services
A provider who is established in one EU Member State may temporarily or occasionally provide its services within the territory of another Member State without having to opening business premises there. Therefore a Polish engineering firm working on a single project in the Czech Republic is engaged in the temporary provision of a service.