For a house, an inspection must be booked for the following stages
Foundation and excavation stage Before the footings are poured. Aspects of this stage include boundary clearances, footing excavation, reinforcement etc.
Slab stage Before the concrete is poured. Aspects of this stage include floor level check, termite treatment etc.
Frame stage Before the cladding or lining is fixed. Aspects of this stage include sub-floor framing, lower wall framing etc.
Final stage Aspects of this stage include site works, drainage, fire safety, energy and water efficiency etc.
The dwelling cannot proceed past each stage until the previous stage where a form 16 stage certificate has been issued by the building certifier.
Further information regarding inspections can be view here at Guidelines Inspection of Class 2 to 9 buildings