I tend not to use the cramped workshop as a meditation spot, though on warm afternoons there is a spot outside it I use as such.
Not sure but my unheated workshop might be warmer as a "bedroom" than parts of my hardly-heated house, in very cold weather!
One-inch foam board above the ceiling, below the wriggly asbestos-cement roof; same material on the single-skin concrete-block walls, behind sterling-board; external "double-glazing" made from twin-wall polycarbonate roofing sheets, on the large, single-thickness glass windows. .
Oh, and a luxuriant growth of ivy now covering at least a third of the roof. That must add to the insulation.
It's surprising how warm it seems to become after an hour or so doing any work in there.
Just about room on the floor for a lightweight camping mattress and sleeping-bag, if I shuffle things about a bit and sweep the floor….
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My "design office" is split over two places. One is the front room where the PC, with TurboCAD installed, lives. The other, which I use only infrequently, is my local pub, with table space for a notebook (the paper type, not a little confuser) and a couple of pencils.