Specific formalities in case of construction works - declaration of works and presence registration (checkinatwork)

Where an employer posts workers in Belgium with a view to performing construction works, certain specific formalities may be required, depending on the estimated amount of the works :   

Declaration of works   

First information about the declaration of works :

In French language = https://www.socialsecurity.be/site_fr/employer/applics/ddt/general/declaration_bis.htm   

In Dutch language = https://www.socialsecurity.be/site_nl/employer/applics/ddt/general/declaration_bis.htm  

In German language = https://www.socialsecurity.be/site_de/employer/applics/ddt/general/declaration_bis.htm

Presence registration (checkinatwork)

First information about the presence registration : 

In dutch:

https://www.socialsecurity.be/site_nl/employer/applics/checkinatwork/index.htm 

In French:

https://www.socialsecurity.be/site_fr/employer/applics/checkinatwork/index.htm  

In German :
https://www.socialsecurity.be/site_de/employer/applics/checkinatwork/index.htm

and  

In Dutch:

https://www.socialsecurity.be/site_nl/employer/applics/checkinatwork/general/construction-works.htm 

In French:       

https://www.socialsecurity.be/site_fr/employer/applics/checkinatwork/general/construction-works.htm 

In German :

https://www.socialsecurity.be/site_de/employer/applics/checkinatwork/general/construction-works.htm

Contact details  

In Dutch:

https://www.socialsecurity.be/site_nl/employer/general/contactcenter/index.htm  

In French:  

https://www.socialsecurity.be/site_fr/employer/general/contactcenter/index.htm 

In German language =

https://www.socialsecurity.be/site_de/employer/general/contactcenter/index.htm