Purpose - Leadership is a significant success factor in promoting sustainability practices in the construction industry. Sustainability is an integral part of the construction industry and affects all aspects of construction business operations. The purpose of this paper is to investigate if there is any particular leadership style associated with intra-organizational leaders within UK construction organizations charged with the promotion of sustainability practices. The paper therefore examines the effective leadership style of sustainability professionals responsible for developing sustainable construction strategies. Design/methodology/approach - Qualitative data were collected through semi-structured interview with 15 leaders, followed by an industry-wide survey of 200 intra-organizational leaders in contractor and consultant organizations in the UK construction industry. Findings - The results showed that while there is no one best leadership style for all situation, most leaders charged with the role of promoting sustainable construction are strategic in their style or behaviour. Originality/value - Although leadership and sustainability has been widely covered as separate issues, little rigorous research has been done on the link between leadership and sustainability in construction management research. The findings could guide organizational leaders with the responsibility of promoting sustainability practices.