In today's rapidly evolving construction landscape, sustainability has shifted from a niche concern to a core principle. Sustainable construction projects are those designed, constructed, and operated to minimise environmental impact while maximising social and economic benefits. A key player in achieving this balance is the Quantity Surveyor. This article delves into the role of a Quantity Surveyor in sustainable construction projects, specifically focusing on how they contribute to projects in London, UK. A Conduit Between Cost and Value At its core, the role of a Quantity Surveyor (QS) is to manage all aspects of the contractual and financial side of construction projects. However, in sustainable projects, their role expands. They act as a critical conduit between cost and value, ensuring that environmental objectives can be met without compromising quality or exceeding budgets. Expert in Sustainable Materials and Techniques One of the core responsibilities of a QS in sustaina