Dear Cleint,
Under RERA proviso is attach to section - extension of registration which raed as --
Provided that the Authority may in reasonable circumstances, without default on the part of the promoter, based on the facts of each case, and for reasons to be recorded in writing, extend the registration granted to a project for such time as it considers necessary, which shall, in aggregate, not exceed a period of one year:
In case developer is at fault, but not willful and beyond control circumstance, than his case may be consider for extension.
Not cause of his fault - No liability
Willful Default - complete liability.
But if no extension granted/refused/not applied, than beyond time limit, he is liable under RERA.