This book constitutes selected papers of the 18th International Conference on Computer-Aided Architectural Design Futures, CAAD Futures 2019, held in Daejeon, Republic of Korea, in June 2019. The 34 revised full papers presented were carefully reviewed and selected from 194 submissions. The papers are organized in topical sections on theory, methodology and practice of architectural and interior design; support systems for design decisions; tools, methods and implementation of urban design; rethinking space and spatial behavior; fabrication and materialization; and shape studies.