Resident Welfare Association (RWA) is a civic body that represents interests of the residents living within the society or in specific locality .
RWA can be legally formed by group of Resident Owners. Basic requirement for registration slightly varies state to state.
With Minimum 7 Members within the state can apply for RWA registration with Jurisdictional Registrar Office. In many states Builder Apartment or Group housing society covered under state Apartment Act and therein Apartment Owners Association (AOA) can be formed. And in other cases RWA can be formed. For Example Noida Sector 34 Block C resident can form RWA as they are not in Group housing society and not covered by UP Apartment Act.
Buyer Welfare Association is an Association of Person formed by minimum 7 members with Jurisdictional Registrar Office under Society Registration Act 1860. Basically it it formed by buyers when they does not get possession of flat or pending for registration or Building Completion Certificate not received. To fight against builder this AOP works well.
A Welfare Association under Soceity Registration Act 1860, can be formed at a) State Level with 7 members from same state or b) Central Level with 7 members from each states.