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The trouble with insulation these days is that it's not just one thing. To acheive 6 BERS there is usually a foil backed product in the brick wall cavity, roof insulation batt insulaton and roof foil backed sarking. Really the only thing you can do is the batt insulation as the rest is done...

Yes quite normal for all except insulation. This is most likely non negotiable as the builder has to ensure the property meets 6 BER stars and they are the ones responsible for this. I doubt they would let you organise it yourself in case it did not comply with what was promised to Council which...