1) you must have signed agreement with the builder . what are the clauses of agreement regarding delay in construction ?
2) builder would be liable to compensate you for delay in delivery of possession of flat as per the agreement
3) landowner must have entered into development agreement with builder for development of plot within 24 months or so .
4)if builder delays completion land owner will impose penalty on builder as per the development agreement
5) the agreement signed by you with builder has to be perused for further advise