progress payments on shed - standard versu legal?

getting some quotes for a colourbond shed/garage/workshop.
supply and erect.
I am responsible for siteworks.

one quote in so far:
5% deposit
80% progress payment
15% final payment.

it seems the progress payment is required once they have approval and start constructing frames etc.
in other words I have paid 85% before seeing delivery or any erection/construction on my site.

what is the normal/standard payment structure for sheds etc.
what are they legally entitled to ask for?

thanks in advance.


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