Services by way of pure labour contracts of construction, erection, commissioning, or installation of original works pertaining to a single residential unit otherwise than as a part of a residential complex. ........... Nil rate.
If he takes complete work contract with material, he will have to charge 18% over total cost (without land cost) . ITC can be availed.
But pure labour contract is nil rated...... material directly billed in owner's name.
When complete house property is sold after constructing house over any land, then there will be direct registration of property and no GST bills would be issued. ITC over material or labour cannot be claimed.
In case sold during construction period, GST will be charged at 12% over full agreement value including cost of land. Again ITC available.