With the increasingly successful reduction of operational energy (and thus carbon emissions) in the built environment, the industry’s next challenge is to reduce the carbon intensity of the structures themselves (embodied carbon). We know that clients will play a critical role in this work as what clients ask for, the supply chain works to deliver. UK-GBC also understands that embodied carbon is an area that many clients are just beginning to address. This guide is designed for those who need to write effective briefs for commissioning their first embodied carbon measurements, but who may be at an early stage of embodied carbon knowledge. It is not a how-to guide for measuring carbon, or which method or tools should be adopted.