Carpentry skills were among the most important elements of building practice in premodern China and Japan, and traditional carpentry skills continue in use in both countries to the present day. Although their importance has been greatly marginalised in building practice, in both countries some master carpenters have gained public recognition. This paper compares the modernisation of traditional building knowledge in China and Japan, and the fate of carpentry knowledge as the building industry and the formal discipline of architecture evolved. It distinguishes three phases in this historical trajectory: the period during the introduction of Western architecture as a discipline, when traditional knowledge was rejected or used selectively in the construction of national histories of building; the period when modern technology took over the main building industry and traditional craftsmen had to confront the realities of new technologies of production; and the period, still unfolding today, where heritage movements are promoting the recuperation and development of traditional craft knowledge. For each country, the paper traces how the nation’s history of building was selectively fashioned into an orthodox narrative; explores the content of key early technical works (for China, the official handbook