The aim of this chapter is to draw attention to the use of ICT in the buildning and construction industry with a special interest in the dag-to-day activities of those companies that are working to develop more environmentally friendly and sustainable production processes. The chapter is based on a comprehensive survey of ICT use and attitudes to environmental related issues in in middle and large sized construction companies in Sweden and two case studies: One of ICT use in a larger Swedish building and construction company and one of communication, coordination, and decision making processes in a construction project. Based on the empirical data we argue that in order to enhance a more environmentally friendly building and construction industry there is a need for a more genuine cooperation and knowledge sharing between different actors both in crossing project boundaries as well as overriding contractual limitations. Decisions in a construction project must be taken earlier in the process and construction companies need to focus more on those processes over which they actually do have power.