Tschudi-Madsen worked as an antiquarian at the Directorate for Cultural Heritage in Norway from 1959. He was active for the preservation of Norwegian wooden buildings during the European Architectural Heritage Year campaign that was organized in 1975. He was also one of the pioneers of rediscovering the qualities of the compact Art Nouveau townscape of Ålesund, Norway. He was engaged in international cultural heritage through the association ICOMOS where he held a central position, and through UNESCOs work with World Heritage Sites. Under his leadership Urnes stave church and Bryggen in Bergen were listed in 1979. For a period he was also vice president of the UNESCO World Heritage Committee.[2]
Norway and Conservation Aspect. Vern og Virke 1983, Oslo 1984
Principles in Practice. Reflecting on Conservation of Wooden Architecture. ICOMOS Information, Napoli, Paris 1984
Henrik Bull cop.1983
Restoration and anti-restoration. (2. ed.) Oslo 1981
Introduction. Luce Hinsch: ICOMOS 1965-1980. Oslo 1980
Ansprache des Norwegischen Reichantiquars Stephan Tschudi-Madsen. Verleihung des Europa-Preises und der Europa-Goldmedaille für Denkmalpflege, Hamburg 1979
Akershus Schloss. Le Château d'Akershus. Oslo 1977
Sources of Art Nouveau, New York 1976
Restoration and anti-restoration. A Study in English Restoration Philosophy, Oslo 1976 (2. ed. 1981)
Art Nouveau - byen Ålesund. Arkitektens drøm igår - hans dilemma idag, Byggekunst nr. 114-15 Oslo 1975
Beite, Kåre, Jugendstilen 1974
"Neo-Art Nouveau and psychedelic art". Bulletin du 22. Congés International d'Histoire l'Art, 1969. Budapest 1972
Hauglid, Roar – Report to the Council of Europe on Action relating to the Preservation and Rehabilitation of immovable cultural property, 1970
Art Nouveau, Tokyo 1970
El simbolismo del Art Nouveau. Cuadernos summanueva vision, Buenes Aires 1969
Horta. Los trabajos y el estilo de Victor Horta antes 1900. Cusadernos summanueva vision, Buenes Aires 1969
Art Nouveau. Cauder nos summanueva, Buenes Aires 1969
"Akershus Castle. Unconquered Fortress", The Norseman 1968
Il simbolismo dell'Art Nouveau. Edilizia Moderna, Milano 1965
The works of Alexis de Chateauneuf in London and Oslo 1965
"Rosendal. Norwegian Manor House with Scottish Connections". The Connoisseur, February 1960
Morris and Munthe
"Federico Barocci's "Noli me tangere" and two cartoons". The Burlington Magazine, Vol. CI 1959
An introduction to Edvard Munch's wall paintings in the Oslo University, Aula 1959
Sources of Art Nouveau, Oslo 1956. N.Y. 1957 (2. ed. N.Y. 1975)
Horta. Works and Style before 1900, 1955
"Some recently discovered Drawings by Rubens. The Burlington Magazine, Vol. XCV, September 1953