Not the best practicle advice,
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This review is from: Home Extensions: Planning, Managing and Completing Your Extension (Hardcover)
This book states the obvious a little too much and is a little lacking on practical get it done advice. It does have some handy tips and contains a lot of information but I found that when I actually needed to know what to do next it was not that great.
Still is worthwhile background reading if you are considering an extension.