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The custom home is one of the most complex projects. It involves several disciplines and teams, including internal and external organizations, during the project life cycle. There is information exchange continuously across the teams and often necessary to iterate back and forth between phases. Communication is thus the key to effective project management. This paper deals with the complex structure of the project communication of custom home projects. The objective of this paper is to develop the communication structure for the custom home design and building industry. MDM (Multidomain Matrix) was chosen to address the issue of complex communication processes among teams involved in the project. The four domains; phase, team, activity, and document; were taken into account for forming the MDM. The developed MDM represents team coordination, workflow (activities), and data flow in each phase. It helps support the development of the prototype web-based application for defining data flow, access authorization, and the project communication structure. The results of the testing of the prototype web-based application with the pilot project show that it reduced the lead time of getting information from 3-5 days to 1 day and the number of missing requests is reduced to zero.
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