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Which soil type in Auckland ? It varies dramatically with volcanic areas in the Central city area and clay on the North Shore..
The general rule seems to be about a cu meter underground of Concrete and reinforcing steel and a pier should be about 200-250mm diameter. Or a steel pier with secured plate to the concrete.
Any big hardware place has all the materials. Bunnings, Mitre10, Placemakers. It will be all out in the timber yard area.
I'm on the side of Mt Albert and 'attached' to the lava bed on the southern slopes with a 4 meter square concrete slab about 150mm thick.
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