You're probably better off building it from block and brick from a planning POV. Our cabin is a bit bigger, and factoring in cost of base and all materials, we were close to £8k all in (I built ours, but paid for the wiring and base). The walls of mine are 70mm thick, so it keeps warm quite well. Floor is insulated with 50mm Celotex, the roof with 50mm Celotex as well as 50mm (or 75) glass fibre insulation.
Paying someone else to do it properly for a good spec building, I'd be amazed if you got it under £10k all in. I doubt there'd be a huge amount in it between wood and brick.
Paying someone else to do it properly for a good spec building, I'd be amazed if you got it under £10k all in. I doubt there'd be a huge amount in it between wood and brick.