Remedy of specific performance of agreement is not available here as the act of completing construction cannot be enforced. File a suit for declaration of termination of building against due inability of builder to complete the project. After that you can engage another builder or you can yourself complete the project. The builder is not entitled for any compensation against money expanded him to part construction but your are entitled for the loss suffered due failure of builder.
Remedy of specific performance of agreement is not available here as the act of completing construction cannot be enforced. File a suit for declaration of termination of building against due inability of builder to complete the project. After that you can engage another builder or you can yourself complete the project. The builder is not entitled for any compensation against money expanded him to part construction but your are entitled for the loss suffered due failure of builder.