Hi
I've just completed a detached new build, the process took me 5 years it was harder than I thought (but don't be put off!) and it has been an absolute emotional rollercoaster with huge highs and very low, lows.
Loads of insulation and Celotex, 14kW Air source, 2 MVHR's, no solar, block and beam upstairs and downstairs, underfloor heating both floors, wood burner.