Dear Sir,
If you are in Maharashtra and if a co-operative housing society is formed you have to get NOC from the Society. If the Society refuses NOC, it has to give valid reason for the same. Sometime societies refuse NOC without valid reason. In such cases if the aggrieved member complains to the registrar, he will ask the Society to give reason for refusal. If no valid reason is given the registrar can order the transferee admitted as a member. In your case the society is yet to be formed. I suggest that you apply to the builder to give NOC. If the builder refuses NOC without valid reason, you file a complaint before the consumer court under "Unfair Trade Practice" by the builder. The consumer court will decide the case on merit