Sustainability is viewed as a solution to climate change and social unrest, yet the systems we use to understand and implement it often contribute to the very problems they aim to solve. This thesis investigates how stakeholders in the German construction sector integrate sustainability into their daily practices. Using James Lovelock’s concept of Earth as a self- regulating system, the study explores stakeholders’ perceptions of sustainability. Based on qualitative interviews, the research identifies three main themes: certification systems, economic pressures, and the intrinsic connection of stakeholders to Gaia. Findings suggest that while certification systems guide sustainable practices, they are often used due to other motivations than for genuine environmental efforts. Economic pressures further hinder the adoption of sustainable practices, as stakeholders prioritize short-term gains over long-term ecological benefits. However, a strong connection to Gaia and could inspire deeper engagement with sustainability. The thesis concludes that adopting the interconnectedness emphasized by the Gaia hypothesis could lead to more effective and authentic sustainability practices in the construction sector.