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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...).
NotThamesWater
@Hovis
Looks like we all watch the same stuff on youtube :)
Was very interesting to see how professionals do it. Once the Glulams and eco joists appeared I got somewhat jealous. I do find it odd that these screw piles are claimed to be cheaper than a concrete base though. Maybe the basic DIY screws can be, but I don't believe those ones they used with the installation and the fancy subterrain scanning would cost any less than a slab.
I think @TW is planning on using screwpiles for his though, would be interested to know which supplier he goes for and the cost, I could be way off.