This research delves into the complexities and potential obstacles associated with implementing Lean and Green (L&G) methodologies within the construction sector of Saudi Arabia. Using qualitative research methods, 22 interviews were conducted with industry experts. The findings revealed several primary impediments to the successful deployment of L&G principles. These include a significant deficit in understanding and appreciating the fundamentals of L&G practices, a prevailing focus on financial gains over environmental sustainability, increasing construction and energy costs, deeply ingrained cultural and organisational norms, and a notable shortage of requisite skills and resources. The insights gathered underscore the urgent need for a harmonised, multi-stakeholder initiative involving government bodies, industry leaders, and academic institutions. Such a coordinated effort, in line with Saudi Arabia’s Vision 2030 and the commitments under the Paris Agreement, can help in fostering efficiency and environmental sustainability in the construction sector, provided these identified impediments are effectively addressed and overcome.