Generally with cottage construction in WA if it is double brick, your inner leaf of brickwork had the wall plate on it and supports the roof and is therefore the structural element. The outer leaf is your non structural element.

From the regs it seems you should be able to put a straight edge on the brickwork from the bottom to the top of the external leaf and not see it run out by more than 10mm.

If you are not happy start by talking to the builder rather than the tradie. (Only applies if you are usign a builder)

Unfortunately the shit flow down hill in the building industry and the poor quality is a bit of a legacy of the boom times and the cowboys in it. Brickies are lie :"the platersa will fix it". Plastereres are like "the painters will fix it" and on it goes.

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