Well if you are interested in the history of doors, fireplaces, mouldings and floorboards then this is a really interesting little book. I bought it to help try and find the age of my house, which it did in a limited way. Of course I couldn't find anything in it which exactly matched those of my house but looking at general styles did help alot.
The author has produced several books and guides on fixtures and fittings but the illustrations in this volume are larger and provide ease of comparison with photographs taken during surveys. The dating of the details in a house enable a more comprehensive interpretation of the house, its age and use over the years. An invaluable companion guide.