You will only be really and officially installed in your new abode once you will have gone to your local commune who will transfer your dossier from the former commune of residence to the new one.
The police will automatically check the move is real - a local police officer will come and witness that your new address is really your place of residence. This check will also be made if you change address within a same commune. 
Administrative formalities
- My Home -
Coming to live in Belgium means going through a number of processes in the commune of residence. Normally, foreigners staying more than three months on Belgian soil are considered "residents". They are then subject to procedures that require fulfilling various formalities, both for the resident himself, as well as his partner and children.
