I didn't get what I wanted from this book. If you are completely new to the subject it gives you a fair introduction, and covers the ground well - in fact too well. It spends a lot of time talking about how to find a plot, buying the site, raising finance, all of which were not relevant to me. On the other hand, it said almost nothing about differing construction methods, underfloor heating, heat recovery systems etc. In general, it was too short on technical detail.