Originally published in 1958, A Guide to Western Architecture charts the origins of the system of architectural design that was perfected in Greece, follows its development under the Roman Empire and describes the achievements of the Byzantine architects. Passing through Romanesque to Gothic, the contributions made by Mediaeval builders to structure and design are recorded, and then the impact of the Renaissance on architecture, and its characteristic development in the different European countries. The transplanting of Renaissance ideas to the New World is covered, and finally the origins and nature of the new Western architecture occupy the last section of the book. The Appendix includes a list of the principal architects, and brief notes on their work, from the 5th century B. C. to the end of the Renaissance.

An author of almost sixty books, with topics ranging from interiors to furniture history, from industrial design to the use of plastics, Gloag was a member of an elite design culture that was highly visible throughout the 1930s and 40s.