As per rules the builder has to allot parking space to each member of the apartments complex.
Though after the association is formed the parking space along with the other common areas will come under the control of the association which may, if necessary re-allot the parking space to its members.
According to the “Apartment Act” in most states, car parking is a part of the society's common areas. Since the purchase of parking slots has been deemed illegal, the transaction to purchase would become null and void.
Once the housing society is registered, it becomes the owner of all the common spaces of the apartment complex including the parking spots.
A builder has to provide a certain number of parking spaces basis the number of units of houses. As per a mandate from the Mumbai High Court, the builder is not allowed to sell parking spaces outside the FSI consumed. This has been confirmed by the Supreme Court of India too.