The building contract should detail the progress payment schedule, which in itself should align with the completion of each stage.
In an ideal situation, you’ll receive an invoice from your builder at the end of each stage.
This is known as a “progress claim”.
All you’ll have to do is sign their tax invoice and give the signed invoice to the bank so they can authorise the next drawdown for your construction loan.
Once the builder has been paid for their completed work, they will move on to the next stage of construction.