Nelson begs us to realize that first we must select the tree(s) and that the characteristics of the tree(s) will dictate what size and type of structure can be built. Nelson includes information about which trees are best suited for building in, taking their strength and growing characteristics. This is great information to know, and something I think my tree landscaping books don't include. We learn that the growth of some trees will actually crush the structure over time, while others are too weak to safely hold up a structure, let alone one with people inside it.

The key element in this book is safety. Nelson gives detailed information about how to build a structure that is safe to inhabit, whether it is a playhouse for children or an actual house for adults to use to work or live in. I was surprised to see that some of the tree houses in the book are for actually living in and working in!

Several different methods to attach the structure to the tree are outlined in detail. Exactly what type and how many tree "attachments" to use is explained, such as too many direct nailings into the tree will kill it. I think this information is key.

Looking at the plans for the tree houses in the book, I realized the quality of the workmanship surpasses houses that I have lived in. These are not quick slap-up tree houses, not the type where you use scrap wood that you have lying around. The houses featured have fine edgings, safe banisters and ladders for climbing, beautiful doors and windows. Some have balconies!

Anyone considering building a tree house should read this book first lest they waste their time building a tree house that later kills the tree, ends up being not-secure, or is flat out unsafe for people to use. As a non-carpenter, frankly I am feeling intimidated and doubt I have trees on my property that are worthy!