This paper illustrates how the process and information flow might be accomplished between a manufacturer of prefabricated houses, a real state trustee and end-users, i.e. the holder of the tenant-ownership. The research question investigated is how the house manufacturers can adapt its manufacturing process after customers demand. By mass customisation and a large variation of the final product, houses/flats, can be produced with a standardised manufacturing process. Giving customers the opportunity to design their own apartment with internally possessions can be considered as a competitive advantage. The paper examines the possibility to use an IT system to support the design, manufacturing and customisation process instead of using traditional manually capacity for customers' options. A case study shows that the IT support should mainly focus on the information flow between the manufacturers design and manufacturing process and the real state trustee sales process to minimize errors for an efficient manufacturing. Supply chain management advantages for all stakeholders are found in the concept of using a single source of information. The case study also shows the importance of adapting the information model to the actual building process and product structure and to balance the available options to customers' needs and expectations.