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Hovis
I'm going down the pilings route using cardboard forms.
At some point, I should possibly have an engineer do some fag packet calculations, but my own suggest that 12 pilings, each 300mm diameter & 600m deep, using high strength concrete and a bit of rebar, should support many times the weight of the office I have planned.
It will also use 6 - 8 times less concrete than a slab, meaning I can mix it myself (once I figure out a way to get the cement mixer down the side of the house...).