Registration at commune

Technically speaking, you need at least a 2 rooms apartment.
Area of living rooms must be minimum 33m² (living rooms, so place you can live! NOT the full size of the apartment) and at least one place in the apartment must be 15m² or more.


Few mandatory things to remember:

The kitchen can't be used as a bedroom.
The living room can't be used as a bedroom if you have any child of 6+ years old
The accommodation must have at least 2 bedrooms when the household includes one or more children over 1 year old.
The accommodation must have enough rooms so that a 10 year old child doesn't have to share a room with a child of different sex.
Every room must have a floor area of at least 6 m² when used by 2 persons and 9 m² if used for 3 persons



Else, the commune might state that your apartment is overpopulated... and you'll have problems...

Thanks a lot @alexfrombelgium... As my son is older than 1, I would need to look for 2 bed apartments as per above guidelines.
Is it a usual practice to mention in the lease contract how many persons can register at the address ??

no, you don't mention how many people are going to live in a lease contract.
But in a standard one, the commune will be able to read how much m² is available in the apartment + number of rooms.
As you've to register all your family, it would probably trigger an alarm if there's not enough m²/rooms.

Ohhk...I mean to say does the owner let you know how many persons can register at the address...

The accommodation must have at least 2 bedrooms when the household includes one or more children over 1 year old.

Does it means that a couple with a baby < year old can live in studio apartment? can you provide me a link to this info?

Thanks!

It depends on the region where you live.

https://www.belgium.be/fr/logement/location

Wallonia: http://lampspw.wallonie.be/dgo4/site_lo … &loc=1
Brussels: https://logement.brussels/documents/dir … equipement

AlexFromBelgium wrote:

It depends on the region where you live.

https://www.belgium.be/fr/logement/location

Wallonia: http://lampspw.wallonie.be/dgo4/site_lo … &loc=1
Brussels: https://logement.brussels/documents/dir … equipement

I live in flanders region, not able to find the relavant information on the above links.