As now as per agreement you have already put cheque in process and it get dishonoured since the limitation to issue notice in cheque bounces is one month issue a cheque bounce notice to builder under NI act and. Ask builder to repay within 15 day otherwise you shall file a complaint under 138 NI act.
Get a notice drafted from lawyer the builder shall refund your amount as cheque bounce is criminal liability and he can be arrested for same.
You have acted as per agreement so no need to talk to builder you can formally talk to him if he repays in day or two it's good.otherwise issue a notice. Keep in mind the limitation otherwise your cheque bounce case shall not be maintainable.