Communication is a fundamental part of a construction project. Like any fundamental piece, it must be done in an effective way to ensure the success of the project. Given its importance, understanding the relationship between the different actors involved in a project, analysing the problems that arise between them and investigating the best options to ensure its correct functioning is very important for any actor involved in construction projects.

This thesis, therefore, has as main objective to investigate the problems of communication between the actors involved in construction projects. The thesis will answer the following questions: How does communication within a construction project work? What are the main communication problems that arise in a construction project? How are these problems solved, with what practices and tools?

To solve these questions, a research will be done divided into two parts. The first part is an analysis of the existing literature on communication in construction projects. The second part is an empirical study conducted a qualitative analysis of twelve interviews. These interviews will be made to actors with extensive experience in the sector who have recently been involved in various construction projects.

The results of the thesis indicate the importance of communication within a project and the use of good tools and practices to promote their effectiveness. In addition, the study indicates that there are several widespread problems in construction projects. There is an extended problem with documentation management, this problem is tried to be solved with the use of Information and Communication Technologies. The next problem arises from the informality of many of the communications and from not recording solutions and agreements. A good use of the tools and practices available to the actors involved in the project must solve this problem. The last problem observed and probably the most serious is a widespread communication problem derived by the dispute that seems to exist in the sector, between the construction company and the project management. Avoiding cuts in the budget and trying to avoid many changes with its consequent decrease in the quality of the project, should avoid this problem.