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I had roof replaced (new battens/Tyvek membrane/etc ) and at the time had the beams lifted in. These were the a pair of timber joists bolted together (225x50 I think)
I did everything else apart from the skimming.I wasn't concerned about selling it without Building regs as it didn't cost 40k. I guess it depends what you want it for/money available.
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It's a trade-off between vapour control, insulation and headroom.
It seems that vapour control is often at the bottom of the list.
We have to keep a window permanently open, or I'm woken by dripping sounds...
^ That looks nice up there though.
I imagine you could completely obviate the need to be compliant with building regs by sticking a hatch across the opening, turning it into a fancy storage space.
[Edit] Apparently you might need to be compliant just with boarding out the loft. Who knew.
I did this several years ago which probably cost less than 5k but that was pre children. Currently selling that house (been renting it out) but can't market it as a habitable room.
It was done 'properly' with beams between party walls and new floor joists between the beams.