I have a big bedroom in a house that gets chilly in winter. Rather than heat the whole thing, I decided to build a box around the bed and heat that. Or not heat it, if possible.
It's built out of cheap wood, and has a solid roof with some scrounged polystyrene sheets on top for extra insulation. Basically it's a sheet of 6mm plywood 2.2x2.3m (slightly larger than my king size bed), 2.2m high. There's a sheet of 12mm plywood as the bed-head with gaps top and bottom. The long lengths are 35x70mm pine. There's a brace along the join between the sheets of plywood because it sagged more than I was happy with, and now I can put lightweight stuff on top of it too.
Constructions was easy enough, most of the time was spent waiting for the varnish to dry.
One the timber was in place I bought some nice material for curtains, 20mm plumbing pipe for rails, and sewed it all together. There are ties in the middle of the rails because otherwise they sag. I also bought the cheapest cloth I could find to cover the roof. Having that as a full sheet makes it easier to keep everything in place, and the generous cloth pelmet helps keep heat in.
I think it is warmer in there even without a heater, but turning on a 1kW fan heater brings it up to toasty in a couple of minutes.
Total cost was a bit over $500, about half of which was cloth - 20m of linen at about $12/m . With a smaller bed or cheaper cloth it'd be cheaper, but I like the heavy "hand-woven" stuff I used. Then two sheets of 6mm ply, one of 12mm, and about 13m of 70x35mm pine. Plus 4 litres of varnish, random screws and some PVA glue.
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