We tend to be quite building inspection heavy over here in the UK but I gather if you work with people who know the system well, you can get off-grid style buildings built. Hopefully this is quite a useful example that featured on two episodes of Grand Designs.
Original: https://vimeo.com/28848933
Revisited (apologies for the C4 link which requires hoops to watch): https://www.channel4.com/programmes/grand-designs-revisited/...
Ben Law's website: https://ben-law.co.uk/