Here that's done not by the electricity provider but by the planer of the building who just requests the connection load, so the provider can make then sure the infrastructure (cables, transformers) is ready for it.
The provider knows nothing except this requested load value.
And the local provider is in most cases not even the electricity company actually selling you the electric energy.
This company doesn't even know the load value of the estate, let alone such specific things as living area of appartments within it.