I read this book when planning an extension and refurbishment, and it answered about a million different questions which i'd previously been trying to answer with a very time-consuming and somewhat confusing trawl of the web. Has also empowered me when talking to my shortlist of possible contractors, since they're all full of various bright ideas these days, and this book gave me the confidence to assess their recommendations and remain in control of my decisions. Book also gives good web references for further info. A perfect introduction for the enthusiastic amateur trying to make decisions for an extension or refurbishment.