Slab First or Last - Garden Shed

I'm putting up a 3x4m garden shed.

There is 600mm between the back and side wall and my fence and I want to concrete that. My mate who is a bit of a guru with all things like this has suggested that I put down a 3.6x4.6 slab first and we can put the shed straight on top by welding plates on to the pillars and dyna bolting to ground. He does great work and I have all confidence in that but I had always envisaged setting the pillars in concrete and adding the slab afterwards.

What do you think? Laying the whole slab before the shed would be easier for the concreters i expect...


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