A new survey of his architectural work has analysed the construction process behind the 126 buildings in which he had involvement.
The Mackintosh Architecture exhibition opens at Glasgow University's Hunterian Art Gallery this Friday and is the result of a four-year research project which shows his wide network of colleagues and peers.
As well as the 126 projects involving Mackintosh, including his famous Mackintosh Building at the Glasgow School of Art, the study also encompasses 230 works by the practice of John Honeyman & Keppie and Honeyman, Keppie & Mackintosh
It includes a catalogue of over 1,200 architectural drawings, collected together and made publicly accessible for the first time, as well as biographies of more than 400 clients, contractors and suppliers, many not previously recorded or researched.
There is also a specially commissioned film, models and rarely seen archival material.
Professor Pamela Robertson, Professor of Mackintosh Studies at the University of Glasgow and principal investigator of the project, said: "Today Charles Rennie Mackintosh enjoys a world-wide reputation. He occupied a pivotal point between the Victorian age and the Modern Movement, yet despite this his architecture is remarkably under- researched.
"The resource we have created will provide both academics and amateurs with a much broader understanding of his achievements as pragmatic professional as well as exceptional artist-designer."
The disastrous fire at Mackintosh's GSA has led to a multi-million-pound appeal to rebuild the masterpiece and a trust recently purchased his famous Willow Tea Rooms to safeguard their future.
The Mackintosh Architecture exhibition at the Hunterian will run from July 18 to January 4.