This guide has been developed to give stakeholders the means to unlocking Whole Life Value in infrastructure and building projects. It provides a clear understanding of the concepts and principles underlying the use and application of Whole Life Value. The guide explains methods, techniques and tools to achieve Whole Life Value in planning, commissioning and maintaining assets such as schools, offices, highways and repair and maintenance schemes. The importance of considering the needs of a broader range of stakeholders than just those involved in the immediate decision-making process is also emphasised. The guide will help stakeholders select appropriate tools and challenge the barriers on how Whole Life Value is achieved in infrastructure and buildings. It includes four case studies, illustrating the application of WLV principles on a selection of projects. Annexes list key Whole Life Value drivers in the public sector; and publications, software, websites, and other tools that can help in achieving WLV.