Sustainable and green facts are important for leaving a healthy environment for future generations. These facts are like sustainable development, sustainable city, green building, green economy, and so on. Green building is an innovative solution to sustainable urban planning problems. In this study, green building, sustainability, development processes are examined, and the opportunities and threats of green buildings with their strengths and weaknesses are determined by SWOT analysis. Besides, the construction cost and energy savings of a green building are compared to the traditional building. As a result of SWOT analysis, besides its significant strengths such as sustainability of green buildings, low energy consumption, and independence of energy consumption, high initial investment cost was determined as the most critical weakness. The increase in building values and the emergence of new business ventures are considered opportunities for green buildings, and the perception of green buildings as luxury is considered a threat. Ultimately, this study reveals the critical significance of transitioning towards sustainable construction practices, supported by compelling numerical evidence. Despite the initial higher investment costs, green buildings exhibit substantial long-term benefits, with the construction costs of the LEED gold-certified building calculated at 31,798,854.3 TL and the platinum-certified building at 32,390,841.0 TL in January 2024. Notably, energy savings of 47.7% and 61.6% were projected for the gold and platinum-certified buildings, respectively.