depends on the ground and size of the shed.
for single skin brickwork I'd go 600mm deep x 400mm wide minimum with a concrete depth of around 300mm.
pad depth 75mm laid on 1200g membrane on 50mm sand blind on 150mm hardcore whackered
for cavity wall I'd go 500mm wide with a 75mm cavity.
That's quite a lot. I'm thinking of a 3m x 2.5 shed.
What do you think it would cost to have someone to the footings and base for me? I've had enough of digging and concreting, so not interested. I don't mind laying the bricks though and doing the roof.
No, its a shed, keep it simple. So long as you hit firm earth you'll be fine. It may be more economical/easier to fill your concrete up to a depth just below ground level, rather than faffing about building blockwork in the trench.
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