Where the engineering calls for piers, the only window to check them sits between boring and concrete.
Ground across the City of Melton varies enough that piers appear on some lots and not others. Where they are specified, the depth on the drawing is the figure that has to be met.
Annotated findings from Bored piers inspections on Rockbank builds. Client addresses withheld.

2Slab pre-pourThe day before the pour, with steel and formwork open
3FrameOnce frame and trusses are up and the roof is on, before sarking
4Lock-up (pre-plaster)After roof, cladding and external doors, before plaster
5FixingAfter mouldings, doors and joinery, before painting
6WaterproofingAfter the membrane is applied and cured, before tiling
7Pre-handover (PCI)About a week before practical completionInstant online pricing, or talk to the booking team on 1300 471 805.
Less than an hour on an ordinary residential block.
By then there is nothing remaining to look at.
No. Our report compares the work to the drawing. Certification is the engineer's.
No, it depends on the ground and the engineering.
AS 2870, together with the drawing for your lot.
Yes, everything is open at that stage.