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Max height for a mono pitch roof on an outbuilding within permitted development is 3m, so you need to lose 262mm ideally 263 lol. I've forgotten how big the building is but, potential quick wins could include: 1. reduce height of walls so finish floor to finish ceiling is in the region of 2400...

Also... you'd probably get away some form of cheap thick polystyrene based insulation under the concrete, and then thinner more expensive rigid pir in the roof (celotex for example).

Only had time to skim that quickly but regarding the block and screed detail, you could leave it short but your going to need to line the floor with a dpm under the screed, up the side of the block and out under the dpc (dpc to sit between stud wall and top of block).. if you leave the screed...

Sounds like you've got most of it covered, good work! Yes buying hardcore and removing the old stuffs cheaper and easier than reusing it. Yes you need that other dpm, if you build that detail then you would lay the block band course on the slab, line it with a dpm before insulating and...

The HA buy the houses from the developer at a below market price (I Don't know how much), generally the developer should still make a profit albeit a reduced one on the particular plots however as a shared cost across the build I expect its not too painful as a developer, its also a guaranteed...

Your welcome, ill be following this thread with interest, feel free to ask any questions! ill cover myself by saying my advice may not always be the best but I've got some experience. good work on the demo job, glad to see your taking it apart sensibly and reclaiming materials is a great idea...

Hi, Ive had a crack at answering a few of your questions if its not too late! shouldn't cost anywhere near 40k but it won't be cheap cheap, worth spending money on good footings/slab, cladding and roof covering. good luck, keep us updated