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I have a log cabin style one, it is OK, but does take constant low level heating even though I opted for the thicker wood, its very cheap for the sqm, I paid something like £7k for a 3.5m x 7m one. I think @Soul has\had a more insulated (not sure if sip) one.
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@dst2 - we had one installed at our last house from these guys: https://www.thegardenoffice.co.uk/
Was very well insulated and we added underfloor heating which was great in winter.
Overall issue we had is that we just never used it enough. Certainly didn't get the cost of installing it back in terms of time spent with it. It did help sell the place though...
Prob sip