Interesting to read this as the I've got a similar problem here - except that it's our bedroom above the garage. I don't mind it too much personally, but the wife doesn't like the cold!
In our case our garage has the boiler in it and hence also a frost stat which should keep the temp in there above 4 degC (to protect the boiler) but our room is still the coldest in the house. I did a quick check (drill bit through the garage ceiling in several places) and it seems as if in our case at least there is insulation in there already.
What i've done whch has helped slightly is to insulate the back of the garage door. Got one of these kits from B&Q (sort of foil sandwhich with insulating fibres in the middle) and taped it to the garage door as per instructions, (bit of extra draft-proofing on the edges too). Was a bit sceptical, but it was cheap enough so i thought i'd give it a go and it has made a difference - not huge, but noticeable. Has also made the garage much nicer for me to work in too!
Still looking for more improvements though - have also thought about putting another layer of insulation on the garage ceiling with another plasterboard skin on top - will probably try over the summer. Other than that, underfloor heating seems to be the only option - but it's a bit too £ for me and mega hassle (and if there isn't enough insulation below then you're just p*ssing away £ heating the garage).
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