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It's all wood construction - no brickwork at all. It sits on a grid of 12 concrete 'piers'. The walls are, from the inside --> out, Plasterboard, OSB, cellotex insulation (75mm), ply, breather membrane, battens (with air gap), cladding.
It's officially under 2500mm tall (ahem.....) so no planning permission was required. As long as no one measures the height too closely. (I originally designed it to be 2400mm but ended up raising the pitch of them roof last minute so I think it's around 2520mm now).
Happy to give you any more details if it helps.
As someone who will hopefully be putting together a similar thing together soon, may I ask a bit about the construction on this? Brick under the wood exterior? Was planning permission needed for something of this size? (I've read the outbuildings bit on the planning portal but still a bit in the dark)