In the literature that deals with the causes of time and cost overruns in building construction there is a certain amount that highlights the role of the client. However, most studies are limited in their approach and they do not fully recognise the potential association between client-related attributes and project success in building projects. In fact, the challenge of investigating client-related attributes in public-sector building projects is of vital importance if society is to gain the high-quality, cost-effective municipal buildings of the future. The selection of the client as the main focus in this research project came as a consequence of the author's working experience. An intensive literature search then showed that only a limited number of studies had examined the client's attributes in relation to project success. The study's results indicate that the client and its project manager are essential factors in driving project outcomes. Unified organisation, and consistent actions and attitudes of the client organisation are crucially linked to keeping the schedule and budget within their limits and ensuring project functionality. Project functionality was also associated with the client's level of proficiency. In the case of the client's project manager, its actions, attitudes, proficiency and experience appear less likely to affect the duration of the project, but are critical in reducing cost and improving the project's functionality. It also appears that the procurement types used within the surveyed projects had an influence on these associations. The findings underlined the major role that clients have to play in constructing public buildings. More consideration has to be taken by clients as to their actions and attitudes during the process of building construction; furthermore, they have to be aware that any changes in their organisation might affect project outcomes. Clients should choose their project manager carefully given that consistent actions, attitudes, proficiency and experience of the project manager are key elements in attaining the successful completion of projects.